Related
Hi guys,
Please clarify on the following points:
1. Are there any major differences among the CPU governers??? I use Smartass because I see a major group of people using it.
2. What are the optimal values for Min and Max CPU speed? And are there any factors based on which we have to decide the values or we can keep anything we wish?
Thanks in advance
Frequencies and their effect on battery here
^Pretty much what you're looking for. Just analyze the chart and test it for yourself too. Also read, read
For governors:
smartass governor - is based on the concept of the interactive governor.
I have always agreed that in theory the way interactive works - by taking over the idle loop - is very attractive. I have never managed to tweak it so it would behave decently in real life. Smartass is a complete rewrite of the code plus more. I think its a success. Performance is on par with the "old" minmax and I think smartass is a bit more responsive. Battery life is hard to quantify precisely but it does spend much more time at the lower frequencies.
Smartass will also cap the max frequency when sleeping to 352Mhz (or if your min frequency is higher than 352 - why?! - it will cap it to your min frequency). Lets take for example the 528/176 kernel, it will sleep at 352/176. No need for sleep profiles any more.
ondemand
Available in most kernels, and the default governor in most kernels. When the CPU load reaches a certain point (see "up threshold" in Advanced Settings), ondemand will rapidly scale the CPU up to meet demand, then gradually scale the CPU down when it isn't needed. - SetCPU website
conservative
Available in some kernels. It is similar to the ondemand governor, but will scale the CPU up more gradually to better fit demand. Conservative provides a less responsive experience than ondemand, but can save battery. - SetCPU website
performance
Available in most kernels. It will keep the CPU running at the "max" set value at all times. This is a bit more efficient than simply setting "max" and "min" to the same value and using ondemand because the system will not waste resources scanning for the CPU load. This governor is recommended for stable benchmarking. - SetCPU website
powersave
Available in some kernels. It will keep the CPU running at the "min" set value at all times. - SetCPU website
userspace
A method for controlling the CPU speed that isn't currently used by SetCPU. For best results, do not use the userspace governor. - SetCPU website
interactive
Advantages:
+ significantly more responsive to ramp cpu up when required (UI interaction)
+ more consistent ramping, existing governors do their cpu load sampling in a workqueue context, the 'interactive' governor does this in a timer context, which gives more consistent cpu load sampling.
+ higher priority for cpu frequency increase, rt_workqueue is used for scaling up, giving the remaining tasks the cpu performance benefit, unlike existing governors which schedule rampup work to occur after your performance starved tasks have completed.
Click to expand...
Click to collapse
I hope that makes it clearer
Kira.Lawliet said:
Frequencies and their effect on battery here
^Pretty much what you're looking for. Just analyze the chart and test it for yourself too. Also read, read
I hope that makes it clearer
Click to expand...
Click to collapse
Wonderful post! Thank you.. even though the post was too technical for a n00b like me, I could grasp info out of it. Sure it helped me.
Hey guys!
I was wondering if anyone can give me some info on the differences between the governors with doomkernel and the schedulers.
Thanks!
Cheers,
This was posted by DooMLoRD, i just copied the post not all governors are there:
2. Governors In the Linux Kernel ================================
2.1 Performance ------------------------------
The CPUfreq governor "performance" sets the CPU statically to the highest frequency within the borders of scaling_min_freq and scaling_max_freq.
2.2 Powersave ----------------------------
The CPUfreq governor "powersave" sets the CPU statically to the lowest frequency within the borders of scaling_min_freq and scaling_max_freq.
2.3 Userspace ----------------------------
The CPUfreq governor "userspace" allows the user, or any userspace program running with UID "root", to set the CPU to a specific frequency by making a sysfs file "scaling_setspeed" available in the CPU-device directory.
2.4 Ondemand ---------------------------
The CPUfreq governor "ondemand" sets the CPU depending on the current usage. To do this the CPU must have the capability to switch the frequency very quickly. There are a number of sysfs file accessible parameters:
sampling_rate: measured in uS (10^-6 seconds), this is how often you want the kernel to look at the CPU usage and to make decisions on what to do about the frequency. Typically this is set to values of around '10000' or more.
show_sampling_rate_(min|max): the minimum and maximum sampling rates available that you may set 'sampling_rate' to.
up_threshold: defines what the average CPU usage between the samplings of 'sampling_rate' needs to be for the kernel to make a decision on whether it should increase the frequency. For example when it is set to its default value of '80' it means that between the checking intervals the CPU needs to be on average more than 80% in use to then decide that the CPU frequency needs to be increased.
ignore_nice_load: this parameter takes a value of '0' or '1'. When set to '0' (its default), all processes are counted towards the 'cpu utilisation' value. When set to '1', the processes that are run with a 'nice' value will not count (and thus be ignored) in the overall usage calculation. This is useful if you are running a CPU intensive calculation on your laptop that you do not care how long it takes to complete as you can 'nice' it and prevent it from taking part in the deciding process of whether to increase your CPU frequency.
2.5 Conservative -------------------------------
The CPUfreq governor "conservative", much like the "ondemand" governor, sets the CPU depending on the current usage. It differs in behaviour in that it gracefully increases and decreases the CPU speed rather than jumping to max speed the moment there is any load on the CPU. This behaviour more suitable in a battery powered environment. The governor is tweaked in the same manner as the "ondemand" governor through sysfs with the addition of:
freq_step: this describes what percentage steps the cpu freq should be increased and decreased smoothly by. By default the cpu frequency will increase in 5% chunks of your maximum cpu frequency. You can change this value to anywhere between 0 and 100 where '0' will effectively lock your CPU at a speed regardless of its load whilst '100' will, in theory, make it behave identically to the "ondemand" governor.
down_threshold: same as the 'up_threshold' found for the "ondemand" governor but for the opposite direction. For example when set to its default value of '20' it means that if the CPU usage needs to be below 20% between samples to have the frequency decreased.
2.6 Interactive ------------------------------
The CPUfreq governor "interactive" is designed for low latency, interactive workloads. This governor sets the CPU speed depending on usage, similar to "ondemand" and "conservative" governors. However there is no polling, or 'sample_rate' required to scale the CPU up.
Sampling CPU load every X ms can lead to under powering the CPU for X ms, leading to dropped framerate, stuttering UI etc..
Scaling the CPU up is done when coming out of idle, and like "ondemand" scaling up will always go to MAX, then step down based off of cpu load.
There is only one tuneable value for this governor:
min_sample_time: The ammount of time the CPU must spend (in uS) at the current frequency before scaling DOWN. This is done to more accurately determine the cpu workload and the best speed for that workload. The default is 50ms.
2.7 MinMax ------------------------------
The CPUfreq governor "maxmin" tries to minimize the frequency jumps by limiting the selected frequencies to only two frequencies: either the min or the max frequency of the current policy. The frequency is raised or lowered according to the current load and the 'up_threshold' and 'down_threshold'.
Its parameters and implementation are similar to that of conservative.
It does not have the freq_step parameter as it jumps right from min to max and vice-versa.
The sampling_down_factor, unlike conservative, will count the minimal number of samplings since the last time we saw the 'up_threshold' load on the CPU. Hence it is set to higher default and acts as a limiter not to do too many frequency jumps without hurting the performance.
Thanks sorry, didnt see it for some reason. Ignore my questions.
Cheers,
oppiee said:
Thanks sorry, didnt see it for some reason. Ignore my questions.
Cheers,
Click to expand...
Click to collapse
One thing to note pal. All chipsets have different tolerances so whereas interactive works best for me, it may not be good for u. Just test em and use CPU spy/ ur own judgement to c which suits ur phone best.
Sent from my X10i using XDA App
Yup I am currently fiddling around with the different settings. The main thing I want to accomplish is not to have lag when im scrolling and opening up basic apps such as dialer and browser. I dont really play games. I hate the fact that the phone lags up sometimes. So far Its ok, but getting some WLOD on super high freq.
Any suggestions?
oppiee said:
Yup I am currently fiddling around with the different settings. The main thing I want to accomplish is not to have lag when im scrolling and opening up basic apps such as dialer and browser. I dont really play games. I hate the fact that the phone lags up sometimes. So far Its ok, but getting some WLOD on super high freq.
Any suggestions?
Click to expand...
Click to collapse
Can u post a screenshot of CPU tuner or whatever u use of freqs u use? Also are u using doomkernel fs version as I think some handsets can't even boot up oc kernel.
Sent from my X10i using XDA App
Any good programs to take screen shots? I am using the highest OC kernel by DL, and using doomkernel wolfbreak V7b6.
Not mean to sound patronising pal but just type screen shot into android market theres plenty
Edit: ur phone prob can't handle the overclock. Read the kernel thread it says this pal.
Sent from my X10i using XDA App
Oh i think there might has been some misunderstanding. My phone is running fine, just doing some testing. at 1.229 Mhz I tend to get WLODs, using minmax with SIO.
At 1.114 and 245, using min max with SIO. everything is fine so far. I just thought you wanted to know for your own purposes.
Cheers
Sorry buddy I misunderstood
Sent from my X10i using XDA App
thers some missing from the top
lagfree
scary
brazilianwax
savaged zen
what do theese do
also whats the best settings from all of them from your opinion
I have:
Brazilianwax
Smoothass
Lagfree
Smartassv2
SavagedZen
Scary
Smartass
Minmax
Interactivex
Interactive
Conservative
Userspace
Powersave
OnDemand
Performance.
Not used them all but lagfree is (as suggested free from lag & smooth. Brazilianwax didnt work for me very laggy. Scary was quite good also, along with interactive. Not really tested the others enough to pass comment to be honest
I bought a new android phone which is the Live with Walkman(WT19i) here in the Philippines, and I'm loving it, except for the battery life
Live with Walkman is known for its poor battery life(which i found here in xda forums), probably because of the crapware software installed in stock ROM and battery which is the EP500 rated at 3.7v 1200mAh. Some users, like me, have a battery capacity of 1160mAh which really suck(probably country/region specific), especially when running with the stock ROM from Sony. So I unlocked my bootloader flashed my kernel to Rage kernel v2.6, wipe all data and cache partitions and installed HYBROM v15 from CWM, so far so good. I installed No frills CPU Control but I'm having a hard time which CPU governor and I/O scheduler to choose. Some people say that I should choose SmartAssv2 and Noop, some say I should choose Conservative and Noop or SIO.
Installed Applications:
Angry Birds(RIO, Seasons, Space)
ASTRO File manager
AdFree
MapDroyd
Facebook(auto sync is OFF)
YouTube
Skype(auto sync is OFF)
oh, and BTW, I integrate these two apps via WinRAR which does not exist in HYBROM v15.
Google Maps
Google Search Widget
-Screen Brightness = 40%(I only set it to max when outdoors)
-Mobile Data network = OFF (using GSM only, I'm using WiFi for browsing, downloading and updating apps)
-AutoSync is off
-I only turn on WiFi when needed
No Frills CPU (My configuration):
Min:122Mhz
Max:1.024Ghz
Governor:SmartAssv2
I/O Scheduler:Noop
Apply on boot: checked
So my question is whats the best CPU Governor and I/O Scheduler combination for the Live with Walkman(assuming your using Rage kernel ang hybrom ROM) providing a balanced cpu performance and battery life for any casual user?
For your CPU config, I suggest increasing the minimum frequency to 320-480ish; because around that frequency it consumes more or less the same voltage. If you set it too low, you may end up using more power because your phone may struggle to process services (caused by low frequency). Reference here -it may be on another device forum but that's applicable on other phones-
IIRC smartassv2 will be defaulting to a low frequency when the phone's screen is off so I think it's good to use it, for your brightness it's ok but I use around 20-30% brightness when outdoors
thanks bro!
sir,
android noob question...
when you installed hybrom on the wt19i,
does the walkman button still work? and does it still have loudspeaker functionality?
im really hesistant in rooting or installing custom rom on mine...
thanks!
use either scary governor or ondemand and about the i/o bfq or sio.
buy a system tuner pro then config your startups and auto kill. mine is -1% / 4 hours deepsleep. min. 122Mhz - max. 1.5Ghz..
melander said:
sir,
android noob question...
when you installed hybrom on the wt19i,
does the walkman button still work? and does it still have loudspeaker functionality?
im really hesistant in rooting or installing custom rom on mine...
thanks!
Click to expand...
Click to collapse
walkman, and walkman button still works, and speakers are still loud and in stereo
and the bonus part, you get DSP manager, which enhances your sound and music experience further
xachiel said:
use either scary governor or ondemand and about the i/o bfq or sio.
buy a system tuner pro then config your startups and auto kill. mine is -1% / 4 hours deepsleep. min. 122Mhz - max. 1.5Ghz..
Click to expand...
Click to collapse
autokill?? I thought killing apps and processes is bad and since killed apps will restart again and will consume more battery life
kevincaja said:
autokill?? I thought killing apps and processes is bad and since killed apps will restart again and will consume more battery life
Click to expand...
Click to collapse
its a memory auto killer. not a task killer. and use gemini app to config auto-run your apps so they dont run at the background
kevincaja said:
walkman, and walkman button still works, and speakers are still loud and in stereo
and the bonus part, you get DSP manager, which enhances your sound and music experience further
Click to expand...
Click to collapse
thanks for the reply sir,
can you please share the steps you did to install the kernel and rom???
im really interested in installing a custom rom on mine...
melander said:
thanks for the reply sir,
can you please share the steps you did to install the kernel and rom???
im really interested in installing a custom rom on mine...
Click to expand...
Click to collapse
First, download all the necessary files:
this thread contains all the necessary files to unlock your bootloader, at the same time flash a custom kernel that contains ClockWorkMod(CWM) and root.
they also include download for the stock kernel with CMW and root but no overclocking, extra cpu governors and I/O scheduler features:
http://forum.xda-developers.com/showthread.php?t=1560613
if you want to overclock your phone, or improve battery life, download rage kernel:
http://forum.xda-developers.com/showthread.php?t=1398910
then download hybrom v15:
http://forum.xda-developers.com/showthread.php?t=1373435
well that's about it, be careful when flashing as you can easily brick your phone.
follow the instruction in the threads I've given to you.
You install custom ROMs via the ClockWorkMod, the only thing you flash via your computer is the kernel. In case your stuck in bootloop, you can always reflash to the stock ROM of sony ericsson.
Stock ROM for WT19i:
http://dl.dropbox.com/u/17122099/Sony Tools/WT19i_4.0.2.A.0.62__1254-1889.ftf
then flash it with flashtool or using the sofware on this thread.
NOTE:
-Rage kernel has a different way of entering in ClockWorkMod, turn your phone on. As it boots up, as soon you see the LED indicator turns blue or as soon as the boot logo brightens up, immediately press the home key to enter ClockWorkMod.
-in the stock kernel with CMW and root, the LED indicator is always off. Turn your phone on. Press the on-off key once or twice as soon as the b logo gets brighter, to enter in ClockWorkMod.
kevincaja said:
thanks bro!
Click to expand...
Click to collapse
I kinda disagree.If i remember correctly your phone has minimum frequency of 245 with stock kernel so why increasing?I use my mini with rage kernel at 122-1024 smartassV2 governor never had any problem.I use profile for screen off settings are 122-368.Battery consumption is 0.4-0.5% over night not in flight mode and cpu spy shows 99% of that time cpu is sitting on 122 MHz.So unless your phone is heavy loaded with apps that constantly require cpu power i recommend trying my settings and test over night, you got nothing to loose after all
kevincaja said:
First, download all the necessary files:
this thread contains all the necessary files to unlock your bootloader, at the same time flash a custom kernel that contains ClockWorkMod(CWM) and root.
they also include download for the stock kernel with CMW and root but no overclocking, extra cpu governors and I/O scheduler features:
http://forum.xda-developers.com/showthread.php?t=1560613
if you want to overclock your phone, or improve battery life, download rage kernel:
http://forum.xda-developers.com/showthread.php?t=1398910
then download hybrom v15:
http://forum.xda-developers.com/showthread.php?t=1373435
well that's about it, be careful when flashing as you can easily brick your phone.
follow the instruction in the threads I've given to you.
You install custom ROMs via the ClockWorkMod, the only thing you flash via your computer is the kernel. In case your stuck in bootloop, you can always reflash to the stock ROM of sony ericsson.
Stock ROM for WT19i:
http://dl.dropbox.com/u/17122099/Sony Tools/WT19i_4.0.2.A.0.62__1254-1889.ftf
then flash it with flashtool or using the sofware on this thread.
NOTE:
-Rage kernel has a different way of entering in ClockWorkMod, turn your phone on. As it boots up, as soon you see the LED indicator turns blue or as soon as the boot logo brightens up, immediately press the home key to enter ClockWorkMod.
-in the stock kernel with CMW and root, the LED indicator is always off. Turn your phone on. Press the on-off key once or twice as soon as the b logo gets brighter, to enter in ClockWorkMod.
Click to expand...
Click to collapse
Wow, thanks so much for the very detailed guide!
Will try it out now!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Running Hybrom V15 now with Rage Kernel.
So far so good.
Now, how do I set the CPU frequency?
Kira.Lawliet said:
For your CPU config, I suggest increasing the minimum frequency to 320-480ish; because around that frequency it consumes more or less the same voltage. If you set it too low, you may end up using more power because your phone may struggle to process services (caused by low frequency). Reference here -it may be on another device forum but that's applicable on other phones-
IIRC smartassv2 will be defaulting to a low frequency when the phone's screen is off so I think it's good to use it, for your brightness it's ok but I use around 20-30% brightness when outdoors
Click to expand...
Click to collapse
I have had my minimum CPU frequency on 122 MHz for months, no problem. Phone sets the CPU frequency itself higher, when it needs more power. Putting minimum too low doesn't affect it.
T3sla said:
I kinda disagree.If i remember correctly your phone has minimum frequency of 245 with stock kernel so why increasing?I use my mini with rage kernel at 122-1024 smartassV2 governor never had any problem.I use profile for screen off settings are 122-368.Battery consumption is 0.4-0.5% over night not in flight mode and cpu spy shows 99% of that time cpu is sitting on 122 MHz.So unless your phone is heavy loaded with apps that constantly require cpu power i recommend trying my settings and test over night, you got nothing to loose after all
Click to expand...
Click to collapse
I have exactly same settings.
---------- Post added at 01:31 PM ---------- Previous post was at 01:18 PM ----------
xachiel said:
its a memory auto killer. not a task killer. and use gemini app to config auto-run your apps so they dont run at the background
Click to expand...
Click to collapse
Taskkillers/memoryautokillers etc are useless, even not recommended for Android. These close apps, that need to be running and when they start again, consume more battery.
Android is built self to kill apps, which are no longer needed in memory. It kills some apps, when free RAM amount reaches minfree level, amount of RAM that has to be always free.
If you want to improve RAM, better try out V6 Supercharger, link in my signature. It changes the minfree amounts to higher of lower, which one you want. Either multitasking, lowers minfree amount to allow more apps to work at one time, so you can access these easily, without the need of reopening. Or higher minfree amount, to keep more free RAM.
I personally have chosen Balanced.
Someguyfromhell said:
I have had my minimum CPU frequency on 122 MHz for months, no problem. Phone sets the CPU frequency itself higher, when it needs more power. Putting minimum too low doesn't affect it.
I have exactly same settings.
---------- Post added at 01:31 PM ---------- Previous post was at 01:18 PM ----------
Taskkillers/memoryautokillers etc are not useless, even not recommended for Android. These close apps, that need to be running and when they start again, consume more battery.
Android is built self to kill apps, which are no longer needed in memory. It kills some apps, when free RAM amount reaches minfree level, amount of RAM that has to be always free.
If you want to improve RAM, better try out V6 Supercharger, link in my signature. It changes the minfree amounts to higher of lower, which one you want. Either multitasking, lowers minfree amount to allow more apps to work at one time, so you can access these easily, without the need of reopening. Or higher minfree amount, to keep more free RAM.
I personally have chosen Balanced.
Click to expand...
Click to collapse
And i use V6supercharger too among others scriptsNext project undervolting.
Phone sets the CPU frequency itself higher, when it needs more power. Putting minimum too low doesn't affect it.
Click to expand...
Click to collapse
It does affect it in a little way; putting it up on low frequency -> phone will scale frequency according to needed -> what does it use to scale? -> uses abit of power to scale according to needed; so it's logical to why not set it to a mid frequency when it consumes the same volt therefore not wasting a bit energy to scale up or down when needed; of course' the number of your apps/running services affects this so it depends; you might hardly notice any change at all. It just that it's optimal but I'll not argue with this since we don't ran out of battery anyway on travelling eh?
-reference #1, #2 read more have fun testing
Kira.Lawliet said:
It does affect it in a little way; putting it up on low frequency -> phone will scale frequency according to needed -> what does it use to scale? -> uses abit of power to scale according to needed; so it's logical to why not set it to a mid frequency when it consumes the same volt therefore not wasting a bit energy to scale up or down when needed; of course' the number of your apps/running services affects this so it depends; you might hardly notice any change at all. It just that it's optimal but I'll not argue with this since we don't ran out of battery anyway on travelling eh?
-reference #1, #2 read more have fun testing
Click to expand...
Click to collapse
Yes but cpu power from my poor knowledge depends from frequency, so when you set a 3 times higher minimum frequency even if voltage is the same you'll have 3 times more power consumption when idle.I don't think that scaling cpu consumes more than 3 times powerBTW very interesting threads you provide us, did some reading so far and definitely gonna read the whole thing
melander said:
Wow, thanks so much for the very detailed guide!
Will try it out now!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Running Hybrom V15 now with Rage Kernel.
So far so good.
Now, how do I set the CPU frequency?
Click to expand...
Click to collapse
you can download No Frills CPU Control in the Google Play Store(Market) for beginners, i suggest using SmartAssv2 for the CPU governor and Noop or SIO for the I/O Scheduler. as i remember, Noop or SIO provides the fastest throughput and best suitable for flash storage
here's the list of the advantages and disadvantages of those I/O Schedulers:
Q. "What purposes does an i/o scheduler serve?"
A.
Minimize hard disk seek latency.
Prioritize I/O requests from processes.
Allocate disk bandwidth for running processes.
Guarantee that certain requests will be served before a deadline.
So in the simplest of simplest form: Kernel controls the disk access using I/O Scheduler.
Q. "What goals every I/O scheduler tries to balance?"
A.
Fairness (let every process have its share of the access to disk)
Performance (try to serve requests close to current disk head position first, because seeking there is fastest)
Real-time (guarantee that a request is serviced in a given time)
Q. "Description, advantages, disadvantages of each I/O Scheduler?"
A.
1) Noop
Inserts all the incoming I/O requests to a First In First Out queue and implements request merging. Best used with storage devices that does not depend on mechanical movement to access data (yes, like our flash drives). Advantage here is that flash drives does not require reordering of multiple I/O requests unlike in normal hard drives.
Advantages:
Serves I/O requests with least number of cpu cycles. (Battery friendly?)
Best for flash drives since there is no seeking penalty.
Good throughput on db systems.
Disadvantages:
Reduction in number of cpu cycles used is proportional to drop in performance.
2) Deadline
Goal is to minimize I/O latency or starvation of a request. The same is achieved by round robin policy to be fair among multiple I/O requests. Five queues are aggressively used to reorder incoming requests.
Advantages:
Nearly a real time scheduler.
Excels in reducing latency of any given single I/O.
Best scheduler for database access and queries.
Bandwidth requirement of a process - what percentage of CPU it needs, is easily calculated.
Like noop, a good scheduler for solid state/flash drives.
Disadvantages:
When system is overloaded, set of processes that may miss deadline is largely unpredictable.
3) CFQ
Completely Fair Queuing scheduler maintains a scalable per-process I/O queue and attempts to distribute the available I/O bandwidth equally among all I/O requests. Each per-process queue contains synchronous requests from processes. Time slice allocated for each queue depends on the priority of the 'parent' process. V2 of CFQ has some fixes which solves process' i/o starvation and some small backward seeks in the hope of improving responsiveness.
Advantages:
Considered to deliver a balanced i/o performance.
Easiest to tune.
Excels on multiprocessor systems.
Best database system performance after deadline.
Disadvantages:
Some users report media scanning takes longest to complete using CFQ. This could be because of the property that since the bandwidth is equally distributed to all i/o operations during boot-up, media scanning is not given any special priority.
Jitter (worst-case-delay) exhibited can sometimes be high, because of the number of tasks competing for the disk.
4) BFQ
Instead of time slices allocation by CFQ, BFQ assigns budgets. Disk is granted to an active process until it's budget (number of sectors) expires. BFQ assigns high budgets to non-read tasks. Budget assigned to a process varies over time as a function of it's behavior.
Advantages:
Believed to be very good for usb data transfer rate.
Believed to be the best scheduler for HD video recording and video streaming. (because of less jitter as compared to CFQ and others)
Considered an accurate i/o scheduler.
Achieves about 30% more throughput than CFQ on most workloads.
Disadvantages:
Not the best scheduler for benchmarking.
Higher budget assigned to a process can affect interactivity and increased latency.
5) SIO
Simple I/O scheduler aims to keep minimum overhead to achieve low latency to serve I/O requests. No priority quesues concepts, but only basic merging. Sio is a mix between noop & deadline. No reordering or sorting of requests.
Advantages:
Simple, so reliable.
Minimized starvation of requests.
Disadvantages:
Slow random-read speeds on flash drives, compared to other schedulers.
Sequential-read speeds on flash drives also not so good.
6) V(R)
Unlike other schedulers, synchronous and asynchronous requests are not treated separately, instead a deadline is imposed for fairness. The next request to be served is based on it's distance from last request.
Advantages:
May be best for benchmarking because at the peak of it's 'form' VR performs best.
Disadvantages:
Performance fluctuation results in below-average performance at times.
Least reliable/most unstable.
7) Anticipatory
Based on two facts
i) Disk seeks are really slow.
ii) Write operations can happen whenever, but there is always some process waiting for read operation.
So anticipatory prioritize read operations over write. It anticipates synchronous read operations.
Advantages:
Read requests from processes are never starved.
As good as noop for read-performance on flash drives.
Disadvantages:
'Guess works' might not be always reliable.
Reduced write-performance on high performance disks.
Q. "Best I/O Scheduler?"
A.There is nothing called "best" i/o scheduler. Depending on your usage environment and tasks/apps been run, use different schedulers. That's the best i can suggest.
However, considering the overall performance, battery, reliability and low latency, it is believed that
SIO > Noop > Deadline > VR > BFQ > CFQ, given all schedulers are tweaked and the storage used is a flash device.
Q. "How do i change I/O schedulers?"
Voltage Control or No Frills from market.
And here's the list and explanations for all CPU Governors for a custom android kernel:
These are the 18 governors we're talking about.
1) Ondemand
2) Ondemandx
3) Conservative
4) Interactive
5) Interactivex
6) Lulzactive
7) Smartass
8) SmartassV2
9) Intellidemand
10) Lazy
11) Lagfree
12) Lionheart
13) LionheartX
14) Brazilianwax
15) SavagedZen
16) Userspacce
17) Powersave
18) Performance
1) Ondemand:
Default governor in almost all stock kernels. One main goal of the ondemand governor is to switch to max frequency as soon as there is a CPU activity detected to ensure the responsiveness of the system. (You can change this behavior using smooth scaling parameters, refer Siyah tweaks at the end of 3rd post.) Effectively, it uses the CPU busy time as the answer to "how critical is performance right now" question. So Ondemand jumps to maximum frequency when CPU is busy and decreases the frequency gradually when CPU is less loaded/apporaching idle. Even though many of us consider this a reliable governor, it falls short on battery saving and performance on default settings. One potential reason for ondemand governor being not very power efficient is that the governor decide the next target frequency by instant requirement during sampling interval. The instant requirement can response quickly to workload change, but it does not usually reflect workload real CPU usage requirement in a small longer time and it possibly causes frequently change between highest and lowest frequency.
2) Ondemandx:
Basically an ondemand with suspend/wake profiles. This governor is supposed to be a battery friendly ondemand. When screen is off, max frequency is capped at 500 mhz. Even though ondemand is the default governor in many kernel and is considered safe/stable, the support for ondemand/ondemandX depends on CPU capability to do fast frequency switching which are very low latency frequency transitions. I have read somewhere that the performance of ondemand/ondemandx were significantly varying for different i/o schedulers. This is not true for most of the other governors. I personally feel ondemand/ondemandx goes best with SIO I/O scheduler.
3) Conservative:
A slower Ondemand which scales up slowly to save battery. The conservative governor is based on the ondemand governor. It functions like the Ondemand governor by dynamically adjusting frequencies based on processor utilization. However, the conservative governor increases and decreases CPU speed more gradually. Simply put, this governor increases the frequency step by step on CPU load and jumps to lowest frequency on CPU idle. Conservative governor aims to dynamically adjust the CPU frequency to current utilization, without jumping to max frequency. The sampling_down_factor value acts as a negative multiplier of sampling_rate to reduce the frequency that the scheduler samples the CPU utilization. For example, if sampling_rate equal to 20,000 and sampling_down_factor is 2, the governor samples the CPU utilization every 40,000 microseconds.
4) Interactive:
Can be considered a faster ondemand. So more snappier, less battery. Interactive is designed for latency-sensitive, interactive workloads. Instead of sampling at every interval like ondemand, it determines how to scale up when CPU comes out of idle. The governor has the following advantages: 1) More consistent ramping, because existing governors do their CPU load sampling in a workqueue context, but interactive governor does this in a timer context, which gives more consistent CPU load sampling. 2) Higher priority for CPU frequency increase, thus giving the remaining tasks the CPU performance benefit, unlike existing governors which schedule ramp-up work to occur after your performance starved tasks have completed. Interactive It's an intelligent Ondemand because of stability optimizations. Why??
Sampling the CPU load every X ms (like Ondemand) can lead to under-powering the CPU for X ms, leading to dropped frames, stuttering UI, etc. Instead of sampling the CPU at a specified rate, the interactive governor will check whether to scale the CPU frequency up soon after coming out of idle. When the CPU comes out of idle, a timer is configured to fire within 1-2 ticks. If the CPU is very busy between exiting idle and when the timer fires, then we assume the CPU is underpowered and ramp to max frequency.
5) Interactivex:
This is an Interactive governor with a wake profile. More battery friendly than interactive.
6) Lulzactive:
This new find from Tegrak is based on Interactive & Smartass governors and is one of the favorites.
Old Version: When workload is greater than or equal to 60%, the governor scales up CPU to next higher step. When workload is less than 60%, governor scales down CPU to next lower step. When screen is off, frequency is locked to global scaling minimum frequency.
New Version: Three more user configurable parameters: inc_cpu_load, pump_up_step, pump_down_step. Unlike older version, this one gives more control for the user. We can set the threshold at which governor decides to scale up/down. We can also set number of frequency steps to be skipped while polling up and down.
When workload greater than or equal to inc_cpu_load, governor scales CPU pump_up_step steps up. When workload is less than inc_cpu_load, governor scales CPU down pump_down_step steps down.
Example:
Consider
inc_cpu_load=70
pump_up_step=2
pump_down_step=1
If current frequency=200, Every up_sampling_time Us if cpu load >= 70%, cpu is scaled up 2 steps - to 800.
If current frequency =1200, Every down_sampling_time Us if cpu load < 70%, cpu is scaled down 1 step - to 1000.
7) Smartass:
Result of Erasmux rewriting the complete code of interactive governor. Main goal is to optimize battery life without comprising performance. Still, not as battery friendly as smartassV2 since screen-on minimum frequency is greater than frequencies used during screen-off. Smartass would jump up to highest frequency too often as well.
8) SmartassV2:
Version 2 of the original smartass governor from Erasmux. Another favorite for many a people. The governor aim for an "ideal frequency", and ramp up more aggressively towards this freq and less aggressive after. It uses different ideal frequencies for screen on and screen off, namely awake_ideal_freq and sleep_ideal_freq. This governor scales down CPU very fast (to hit sleep_ideal_freq soon) while screen is off and scales up rapidly to awake_ideal_freq (500 mhz for GS2 by default) when screen is on. There's no upper limit for frequency while screen is off (unlike Smartass). So the entire frequency range is available for the governor to use during screen-on and screen-off state. The motto of this governor is a balance between performance and battery.
9) Intellidemand:
Intellidemand aka Intelligent Ondemand from Faux is yet another governor that's based on ondemand. Unlike what some users believe, this governor is not the replacement for OC Daemon (Having different governors for sleep and awake). The original intellidemand behaves differently according to GPU usage. When GPU is really busy (gaming, maps, benchmarking, etc) intellidemand behaves like ondemand. When GPU is 'idling' (or moderately busy), intellidemand limits max frequency to a step depending on frequencies available in your device/kernel for saving battery. This is called browsing mode. We can see some 'traces' of interactive governor here. Frequency scale-up decision is made based on idling time of CPU. Lower idling time (<20%) causes CPU to scale-up from current frequency. Frequency scale-down happens at steps=5% of max frequency. (This parameter is tunable only in conservative, among the popular governors )
To sum up, this is an intelligent ondemand that enters browsing mode to limit max frequency when GPU is idling, and (exits browsing mode) behaves like ondemand when GPU is busy; to deliver performance for gaming and such. Intellidemand does not jump to highest frequency when screen is off.
10) Lazy:
This governor from Ezekeel is basically an ondemand with an additional parameter min_time_state to specify the minimum time CPU stays on a frequency before scaling up/down. The Idea here is to eliminate any instabilities caused by fast frequency switching by ondemand. Lazy governor polls more often than ondemand, but changes frequency only after completing min_time_state on a step overriding sampling interval. Lazy also has a screenoff_maxfreq parameter which when enabled will cause the governor to always select the maximum frequency while the screen is off.
11) Lagfree:
Lagfree is similar to ondemand. Main difference is it's optimization to become more battery friendly. Frequency is gracefully decreased and increased, unlike ondemand which jumps to 100% too often. Lagfree does not skip any frequency step while scaling up or down. Remember that if there's a requirement for sudden burst of power, lagfree can not satisfy that since it has to raise cpu through each higher frequency step from current. Some users report that video playback using lagfree stutters a little.
12) Lionheart:
Lionheart is a conservative-based governor which is based on samsung's update3 source. Tweaks comes from 1) Knzo 2) Morfic. The original idea comes from Netarchy. See here. The tunables (such as the thresholds and sampling rate) were changed so the governor behaves more like the performance one, at the cost of battery as the scaling is very aggressive.
To 'experience' Lionheart using conservative, try these tweaks:
sampling_rate:10000 or 20000 or 50000, whichever you feel is safer. (transition latency of the CPU is something below 10ms/10,000uS hence using 10,000 might not be safe).
up_threshold:60
down_threshold:30
freq_step:5
Lionheart goes well with deadline i/o scheduler. When it comes to smoothness (not considering battery drain), a tuned conservative delivers more as compared to a tuned ondemand.
13) LionheartX
LionheartX is based on Lionheart but has a few changes on the tunables and features a suspend profile based on Smartass governor.
14) Brazilianwax:
Similar to smartassV2. More aggressive ramping, so more performance, less battery.
15) SavagedZen:
Another smartassV2 based governor. Achieves good balance between performance & battery as compared to brazilianwax.
16) Userspace:
Instead of automatically determining frequencies, lets user set frequencies.
17) Powersave:
Locks max frequency to min frequency. Can not be used as a screen-on or even screen-off (if scaling min frequency is too low).
18) Performance:
Sets min frequency as max frequency. Use this while benchmarking!
So, Governors can be categorized into 3/4 on a high level:
1.a) Ondemand Based:
Works on "ramp-up on high load" principle. CPU busy-time is taken into consideration for scaling decisions. Members: Ondemand, OndemandX, Intellidemand, Lazy, Lagfree.
1.b) Conservative Based:
Members: Conservative, Lionheart, LionheartX
2) Interactive Based:
Works on "make scaling decision when CPU comes out of idle-loop" principle. Members: Interactive, InteractiveX, Lulzactive, Smartass, SmartassV2, Brazilianwax, SavagedZen.
3) Weird Category:
Members: Userspace, Powersave, Performance.
You can read all of these form this thread.
T3sla said:
I kinda disagree.If i remember correctly your phone has minimum frequency of 245 with stock kernel so why increasing?I use my mini with rage kernel at 122-1024 smartassV2 governor never had any problem.I use profile for screen off settings are 122-368.Battery consumption is 0.4-0.5% over night not in flight mode and cpu spy shows 99% of that time cpu is sitting on 122 MHz.So unless your phone is heavy loaded with apps that constantly require cpu power i recommend trying my settings and test over night, you got nothing to loose after all
Click to expand...
Click to collapse
kindly read this thread:
Q. "I'm going to set scaling min freq as 100 mhz because my kernel supports it. Hope there's nothing wrong in doing that."
A. Wait! You may want to stay away from using 100mhz during screen-off or screen-on states for three reasons 1) It seems 100 mhz uses more power than 200 mhz. According to tests, 100 mhz accounted to 1 W / GHz and 200 mhz to 0.7 W / GHz, when both the cores were online. 2) 200 mhz can finish same task faster compared 100 mhz and thus hit deep idle soon. 3) 200 mhz is the 'sweet spot' of frequency in SGS II. ie, the frequency used in the calculations based on the optimal energy to run (Ex: In Milestone it's 550 MHz). So , 'energetically efficient' frequency for our CPU is 200 mhz.
Someguyfromhell said:
I have had my minimum CPU frequency on 122 MHz for months, no problem. Phone sets the CPU frequency itself higher, when it needs more power. Putting minimum too low doesn't affect it.
I have exactly same settings.
---------- Post added at 01:31 PM ---------- Previous post was at 01:18 PM ----------
Taskkillers/memoryautokillers etc are useless, even not recommended for Android. These close apps, that need to be running and when they start again, consume more battery.
Android is built self to kill apps, which are no longer needed in memory. It kills some apps, when free RAM amount reaches minfree level, amount of RAM that has to be always free.
If you want to improve RAM, better try out V6 Supercharger, link in my signature. It changes the minfree amounts to higher of lower, which one you want. Either multitasking, lowers minfree amount to allow more apps to work at one time, so you can access these easily, without the need of reopening. Or higher minfree amount, to keep more free RAM.
I personally have chosen Balanced.
Click to expand...
Click to collapse
thanks for the link to V6 Supercharger, now my phone is lag free
Thank you again for the very detailed explanation...
Currently trying out your recommendations...
Ok I'm hoping this post sticks, because no one has this listed anywhere it seems. I have compiled a list of commonly recognized cpu governors and frequencies that the EVO 3D processor and different kernels recognize. The max frequency depends on the kernel you flashed.
Ok so the Evo 3D processor only changes in intervals of 54 so I
researched. No one seems to have a guide on the net that gives those
numbers. The OC Daemon on ViperRom tells you all your options when
you go into terminal to change it, and it also gives you all the
processor governor options too. Where as with MeanRom and Anthrax
Kernel it gives you the minimum and maximum but shows nothing
inbetween, both with governors and frequencies.
starting with minimum:
192000
216000
270000
324000
378000
432000
486000
540000
594000
648000
702000
756000
810000
864000
918000
972000
1026000
1080000
1134000
1188000 Stock max, not quite 1.2 Ghz
1242000 A true 1.2 Ghz
1296000
1350000
1404000
1458000
1512000
1566000
1620000
1674000
1728000 Zedomax says this is most stable max freq. for him on ViperRom
1782000
1836000
1890000
1944000 Only read of one person having stability with this
Governor settings:
Ondemand - when you need it
Powersave - obviously
Conservative - straight forward
Interactive - sounds cut and dry
Performance - I guess hardcore gaming
Userspace - not sure what this one does
Auto - Uses kernel to determine
The userspace governer is basically a legacy thing (see: http://www.thinkwiki.org/wiki/How_to_make_use_of_Dynamic_Frequency_Scaling) that allows you or an application/module that resides in userspace to manually adjust the CPU frequency.
This can be used in an android world by allowing an app to modify the CPU frequency without relying on root access, if I remember correctly. It's basically useless though since I don't think any applications aside from maybe setcpu would use such a feature since most applications automatically assume you aren't rooted thus are using the typical default cpu governor.
Good post.
umm.. i think this is in the wrong spot??? maybe im wrong?? should be in the general...
evod3 said:
umm.. i think this is in the wrong spot??? maybe im wrong?? should be in the general...
Click to expand...
Click to collapse
Then how do I move it? Honest question. This is my first true post/thread that I started.
It's just when I go looking for answers for my phone I go directly to the CDMA section. Only after I can't find my answer there do I branch out and search the whole site. I usually dont think of the EVO 3D as a GSM phone. I mean generally speaking the EVO 3D is more on sprint than any other network world wide.
Other than that does anyone else have the problem of not being able to change voltages? I mean the SetCPU app shows it as a tab but when you purchase and download it there's no tab for votages. I dont wanna pay for another app and not have what it advertises. I emailed the devs of setcpu and never heard back. so I feel like I waisted my money on the dern thing.
I want to be able to truely undervolt and overclock my cpu for power saving reasons. Come on. My stock battery life was like 4 hours, 5 tops, with moderate use. ViperRom changed that to 18+ with moderate use. Now Im using MeanRom with the Anthrax kernel, overclocked to 1.3 GHz and im getting a little more than 36 hours with moderate use.
I'm betting with undervolting we could get a lot more battery life.
SketchyStunts said:
You can run viperROM.....it comes with the Tiamat kernel & has vipercontrol/vipermod baked in & can undervolt your heart out. I believe the it come with voltages -100 from stock. Had mine -125 & the most stable ROM i've ran yet.
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?p=24325646
This is from another thread I found earlier. Not sure what is meant buy -100. Is that mV V MV or what?
stephangardner said:
Then how do I move it? Honest question. This is my first true post/thread that I started.
It's just when I go looking for answers for my phone I go directly to the CDMA section. Only after I can't find my answer there do I branch out and search the whole site. I usually dont think of the EVO 3D as a GSM phone. I mean generally speaking the EVO 3D is more on sprint than any other network world wide.
Other than that does anyone else have the problem of not being able to change voltages? I mean the SetCPU app shows it as a tab but when you purchase and download it there's no tab for votages. I dont wanna pay for another app and not have what it advertises. I emailed the devs of setcpu and never heard back. so I feel like I waisted my money on the dern thing.
I want to be able to truely undervolt and overclock my cpu for power saving reasons. Come on. My stock battery life was like 4 hours, 5 tops, with moderate use. ViperRom changed that to 18+ with moderate use. Now Im using MeanRom with the Anthrax kernel, overclocked to 1.3 GHz and im getting a little more than 36 hours with moderate use.
I'm betting with undervolting we could get a lot more battery life.
http://forum.xda-developers.com/showthread.php?p=24325646
This is from another thread I found earlier. Not sure what is meant buy -100. Is that mV V MV or what?
Click to expand...
Click to collapse
That was from awile back when I had the EVO 4g & used vipermod to undervolt on AOSP. I used to get insane battery life. Miss that. Lol
Wait, maybe not can't remember. Stuck in 1x hell at the moment so can't check the link. Grrrrrr
Sent from my PG86100 using xda premium
I disagree. Because this has to do with frequency clocking, I'd say this is very much good to have stuck here.
Perhaps adding further information about undervolting would be even better?
LiquidSolstice said:
I disagree. Because this has to do with frequency clocking, I'd say this is very much good to have stuck here.
Perhaps adding further information about undervolting would be even better?
Click to expand...
Click to collapse
I hope we get some more insight.
I rooted for the sole purpose of getting better battery life. I read about undervolting, overclocking and underclocking to save battery. Then I find I can't change voltages like I thought. I know its out there just gotta get the right dev to respond to this thread.
Sent from my PG86100 using xda premium
stephangardner said:
I hope we get some more insight.
I rooted for the sole purpose of getting better battery life. I read about undervolting, overclocking and underclocking to save battery. Then I find I can't change voltages like I thought. I know its out there just gotta get the right dev to respond to this thread.
Sent from my PG86100 using xda premium
Click to expand...
Click to collapse
Best of luck to you, I'm sure many will thank you for this
stephangardner said:
. Then I find I can't change voltages like I thought..
Sent from my PG86100 using xda premium
Click to expand...
Click to collapse
What rom are you running? in system tuner pro click the "cpu" button you'll come to the screen where you set clock speeds, at the very top is a tab labled "voltage" hit that and there you can set your voltages. be careful though some phones dont play well with some setting, thats why i dont preset voltages in my ROM.
Originally Posted by stephangardner
. Then I find I can't change voltages like I thought..
Sent from my PG86100 using xda premium
Click to expand...
Click to collapse
What rom are you running? in system tuner pro click the "cpu" button you'll come to the screen where you set clock speeds, at the very top is a tab labled "voltage" hit that and there you can set your voltages. be careful though some phones dont play well with some setting, thats why i dont preset voltages in my ROM.
Click to expand...
Click to collapse
+1 for System Tuner Pro, love that app! I, too, hope this thread sticks cause I've been looking for PRECISELY this info to no avail recently!
Subscribed! Howdy folks!
Relevant to Dev. This stays here....
Nice work getting this here, OP.
Here is a great thread with a TON of useful information about kernels, govenors,I/O schedulers, kernel modules and a lot more... Very informative.
http://forum.xda-developers.com/showthread.php?t=1369817
Sent from my PG86100 using Tapatalk 2 Beta-5
steal25 said:
What rom are you running?
Click to expand...
Click to collapse
First Rom was viperRom then I added the rc remix kernel. Second Rom was the meanRom then a few hours later added the anthrax kernel
Sent from my PG86100 using xda premium
droidphile said:
1. GOVERNORS
I) MANUAL:
These are the 18 governors we're talking about.
1) Ondemand 2) Ondemandx 3) Conservative 4) Interactive 5) Interactivex 6) Lulzactive 7) Smartass 8) SmartassV2 9) Intellidemand 10) Lazy 11) Lagfree 12) Lionheart 13) LionheartX 14) Brazilianwax 15) SavagedZen 16) Userspacce 17) Powersave 18) Performance
1) Ondemand: Default governor in almost all stock kernels. One main goal of the ondemand governor is to switch to max frequency as soon as there is a CPU activity detected to ensure the responsiveness of the system. (You can change this behavior using smooth scaling parameters, refer Siyah tweaks at the end of 3rd post.) Effectively, it uses the CPU busy time as the answer to "how critical is performance right now" question. So Ondemand jumps to maximum frequency when CPU is busy and decreases the frequency gradually when CPU is less loaded/apporaching idle. Even though many of us consider this a reliable governor, it falls short on battery saving and performance on default settings. One potential reason for ondemand governor being not very power efficient is that the governor decide the next target frequency by instant requirement during sampling interval. The instant requirement can response quickly to workload change, but it does not usually reflect workload real CPU usage requirement in a small longer time and it possibly causes frequently change between highest and lowest frequency.
2) Ondemandx: Basically an ondemand with suspend/wake profiles. This governor is supposed to be a battery friendly ondemand. When screen is off, max frequency is capped at 500 mhz. Even though ondemand is the default governor in many kernel and is considered safe/stable, the support for ondemand/ondemandX depends on CPU capability to do fast frequency switching which are very low latency frequency transitions. I have read somewhere that the performance of ondemand/ondemandx were significantly varying for different i/o schedulers. This is not true for most of the other governors. I personally feel ondemand/ondemandx goes best with SIO I/O scheduler.
3) Conservative: A slower Ondemand which scales up slowly to save battery. The conservative governor is based on the ondemand governor. It functions like the Ondemand governor by dynamically adjusting frequencies based on processor utilization. However, the conservative governor increases and decreases CPU speed more gradually. Simply put, this governor increases the frequency step by step on CPU load and jumps to lowest frequency on CPU idle. Conservative governor aims to dynamically adjust the CPU frequency to current utilization, without jumping to max frequency. The sampling_down_factor value acts as a negative multiplier of sampling_rate to reduce the frequency that the scheduler samples the CPU utilization. For example, if sampling_rate equal to 20,000 and sampling_down_factor is 2, the governor samples the CPU utilization every 40,000 microseconds.
4) Interactive: Can be considered a faster ondemand. So more snappier, less battery. Interactive is designed for latency-sensitive, interactive workloads. Instead of sampling at every interval like ondemand, it determines how to scale up when CPU comes out of idle. The governor has the following advantages: 1) More consistent ramping, because existing governors do their CPU load sampling in a workqueue context, but interactive governor does this in a timer context, which gives more consistent CPU load sampling. 2) Higher priority for CPU frequency increase, thus giving the remaining tasks the CPU performance benefit, unlike existing governors which schedule ramp-up work to occur after your performance starved tasks have completed. Interactive It's an intelligent Ondemand because of stability optimizations. Why?? Sampling the CPU load every X ms (like Ondemand) can lead to under-powering the CPU for X ms, leading to dropped frames, stuttering UI, etc. Instead of sampling the CPU at a specified rate, the interactive governor will check whether to scale the CPU frequency up soon after coming out of idle. When the CPU comes out of idle, a timer is configured to fire within 1-2 ticks. If the CPU is very busy between exiting idle and when the timer fires, then we assume the CPU is underpowered and ramp to max frequency.
5) Interactivex: This is an Interactive governor with a wake profile. More battery friendly than interactive.
6) Lulzactive: This new find from Tegrak is based on Interactive & Smartass governors and is one of the favorites. Old Version: When workload is greater than or equal to 60%, the governor scales up CPU to next higher step. When workload is less than 60%, governor scales down CPU to next lower step. When screen is off, frequency is locked to global scaling minimum frequency. New Version: Three more user configurable parameters: inc_cpu_load, pump_up_step, pump_down_step. Unlike older version, this one gives more control for the user. We can set the threshold at which governor decides to scale up/down. We can also set number of frequency steps to be skipped while polling up and down. When workload greater than or equal to inc_cpu_load, governor scales CPU pump_up_step steps up. When workload is less than inc_cpu_load, governor scales CPU down pump_down_step steps down. Example: Consider inc_cpu_load=70 pump_up_step=2 pump_down_step=1 If current frequency=200, Every up_sampling_time Us if cpu load >= 70%, cpu is scaled up 2 steps - to 800. If current frequency =1200, Every down_sampling_time Us if cpu load < 70%, cpu is scaled down 1 step - to 1000.
7) Smartass: Result of Erasmux rewriting the complete code of interactive governor. Main goal is to optimize battery life without comprising performance. Still, not as battery friendly as smartassV2 since screen-on minimum frequency is greater than frequencies used during screen-off. Smartass would jump up to highest frequency too often as well.
8) SmartassV2: Version 2 of the original smartass governor from Erasmux. Another favorite for many a people. The governor aim for an "ideal frequency", and ramp up more aggressively towards this freq and less aggressive after. It uses different ideal frequencies for screen on and screen off, namely awake_ideal_freq and sleep_ideal_freq. This governor scales down CPU very fast (to hit sleep_ideal_freq soon) while screen is off and scales up rapidly to awake_ideal_freq (500 mhz for GS2 by default) when screen is on. There's no upper limit for frequency while screen is off (unlike Smartass). So the entire frequency range is available for the governor to use during screen-on and screen-off state. The motto of this governor is a balance between performance and battery.
9) Intellidemand: Intellidemand aka Intelligent Ondemand from Faux is yet another governor that's based on ondemand. Unlike what some users believe, this governor is not the replacement for OC Daemon (Having different governors for sleep and awake). The original intellidemand behaves differently according to GPU usage. When GPU is really busy (gaming, maps, benchmarking, etc) intellidemand behaves like ondemand. When GPU is 'idling' (or moderately busy), intellidemand limits max frequency to a step depending on frequencies available in your device/kernel for saving battery. This is called browsing mode. We can see some 'traces' of interactive governor here. Frequency scale-up decision is made based on idling time of CPU. Lower idling time (<20%) causes CPU to scale-up from current frequency. Frequency scale-down happens at steps=5% of max frequency. (This parameter is tunable only in conservative, among the popular governors ) To sum up, this is an intelligent ondemand that enters browsing mode to limit max frequency when GPU is idling, and (exits browsing mode) behaves like ondemand when GPU is busy; to deliver performance for gaming and such. Intellidemand does not jump to highest frequency when screen is off.
10) Lazy: This governor from Ezekeel is basically an ondemand with an additional parameter min_time_state to specify the minimum time CPU stays on a frequency before scaling up/down. The Idea here is to eliminate any instabilities caused by fast frequency switching by ondemand. Lazy governor polls more often than ondemand, but changes frequency only after completing min_time_state on a step overriding sampling interval. Lazy also has a screenoff_maxfreq parameter which when enabled will cause the governor to always select the maximum frequency while the screen is off.
11) Lagfree: Lagfree is similar to ondemand. Main difference is it's optimization to become more battery friendly. Frequency is gracefully decreased and increased, unlike ondemand which jumps to 100% too often. Lagfree does not skip any frequency step while scaling up or down. Remember that if there's a requirement for sudden burst of power, lagfree can not satisfy that since it has to raise cpu through each higher frequency step from current. Some users report that video playback using lagfree stutters a little.
12) Lionheart: Lionheart is a conservative-based governor which is based on samsung's update3 source. Tweaks comes from 1) Knzo 2) Morfic. The original idea comes from Netarchy. See here. The tunables (such as the thresholds and sampling rate) were changed so the governor behaves more like the performance one, at the cost of battery as the scaling is very aggressive.
To 'experience' Lionheart using conservative, try these tweaks: sampling_rate:10000 or 20000 or 50000, whichever you feel is safer. (transition latency of the CPU is something below 10ms/10,000uS hence using 10,000 might not be safe). up_threshold:60 down_threshold:30 freq_step:5 Lionheart goes well with deadline i/o scheduler. When it comes to smoothness (not considering battery drain), a tuned conservative delivers more as compared to a tuned ondemand.
13) LionheartX LionheartX is based on Lionheart but has a few changes on the tunables and features a suspend profile based on Smartass governor.
14) Brazilianwax: Similar to smartassV2. More aggressive ramping, so more performance, less battery.
15) SavagedZen: Another smartassV2 based governor. Achieves good balance between performance & battery as compared to brazilianwax.
16) Userspace: Instead of automatically determining frequencies, lets user set frequencies.
17) Powersave: Locks max frequency to min frequency. Can not be used as a screen-on or even screen-off (if scaling min frequency is too low).
18) Performance: Sets min frequency as max frequency. Use this while benchmarking!
So, Governors can be categorized into 3/4 on a high level: 1.a) Ondemand Based: Works on "ramp-up on high load" principle. CPU busy-time is taken into consideration for scaling decisions. Members: Ondemand, OndemandX, Intellidemand, Lazy, Lagfree. 1.b) Conservative Based: Members: Conservative, Lionheart, LionheartX 2) Interactive Based: Works on "make scaling decision when CPU comes out of idle-loop" principle. Members: Interactive, InteractiveX, Lulzactive, Smartass, SmartassV2, Brazilianwax, SavagedZen. 3) Weird Category: Members: Userspace, Powersave, Performance.
Click to expand...
Click to collapse
Good explanations as to what the OP was trying to relay.
gunfromsako said:
Here is a great thread with a TON of useful information about kernels, govenors,I/O schedulers, kernel modules and a lot more... Very informative.
http://forum.xda-developers.com/showthread.php?t=1369817
Click to expand...
Click to collapse
I'll have to read this one when I'm on a computer. Way to much info for the app.
steal25 said:
in system tuner pro click the "cpu" button you'll come to the screen where you set clock speeds, at the very top is a tab labled "voltage" hit that and there you can set your voltages.
Click to expand...
Click to collapse
Brownie points for this guy. Downloaded that app now and loving it. I'm gonna start with a 10 mV decrease on all voltages then do like 2 mV increments till I have issues then I'll report back.
dimebagdan65 said:
+1 for System Tuner Pro, love that app!
Click to expand...
Click to collapse
+2
By the way guys and gals does anyone else here have dyslexia? I didn't think I could get into all this because of it but I find it kinda soothing. Like working on cars helps with my ADHD. I feel like Jessie from The Fast And The Furious. Ha ha
Sent from my PG86100 using xda premium
oohaylima said:
Good explanations as to what the OP was trying to relay.
Click to expand...
Click to collapse
Same post I linked right above you...
I wipe till it bleeds...
gunfromsako said:
Same post I linked right above you...
I wipe till it bleeds...
Click to expand...
Click to collapse
I know. All I did was quote the author of the section that pertains to the governor in which the OP was trying to break down in the beginning.
I'm a big fan of keeping things under one thread for easy fluidity of related information.
gunfromsako said:
Same post I linked right above you...
I wipe till it bleeds...
Click to expand...
Click to collapse
Oh... my... GOD! I friggin love your sig! My sides hurt! I'm totally with ya! Never want problems? Always start with a clean slate! Duh... ^_^
I always keep my phone undervolted -50mv @ 1.5GHz intellanthrax. That's the farthest I can go without problems.
sent from America...F__k Yeah!
Comin again to save the motherf**kin day yeah!
Only one question... Rockin out or ballad style? XD
Alright, below this, I will include an almost full guide to setting up STweaks (for those who do not want to use the provided profiles)
The CPU section contains the frequencies and voltages that you want to run at.
200mHz is the minimum speed, 1800mHz is the maximum speed. You can change these to affect your overall performance or battery life. Mine is currently set to 200mHz minimum, 1800mHz maximum. I have seen no hit on battery life at all (might be miniscule.)
Now for the voltages.. Each and every person will have a different set of voltages, as every CPU will be a little bit different. You can manually set your frequency to a certain level, use a CPU stress testing app (stability test) and drop the voltage by SMALL increments until you start to lose stability (system crashes, app force closes, etc.) I usually go UP one voltage step over the borderline stable voltage. I will post my voltages, but take caution, as my voltages are set pretty low compared to stock values on the kernel.
1800mHz - set to 1200000 uV or 1.2 volts.
1704mHz - set to 1175000 uV or 1.175 volts.
1600mHz - set to 1112500 uV or 1.1125 volts.
1500mHz - set to 1100000 uV or 1.1 volts.
1400mHz - set to 1062500 uV or 1.0625 volts.
1300mHz - set to 1025000 uV or 1.025 volts.
1200mHz - set to 1000000 uV or 1 volt.
1100mHz - set to 975000 uV or 0.975 volts.
1000mHz - set to 962500 uV or 0.9625 volts.
900mHz - set to 937500 uV or 0.9375 volts.
800mHz - set to 912500 uV or 0.9125 volts.
700mHz - set to 887500 uV or 0.8875 volts.
600mHz - set to 862500 uV or 0.8625 volts.
500mHz - set to 837500 uV or 0.8375 volts.
400mHz - set to 812500 uV or 0.8125 volts.
300mHz - set to 800000 uV or 0.8 volts.
200mHz - set to 787500 uV or 0.7875 volts. * BE CAREFUL WITH THIS ONE, it can cause your device to lock up when the screen is off, and need a battery pull if the voltage is too low.
CPU Scaling Section - this controls how your device will turn up the speed when it needs to.
Governor - This contols how the device will respond overall (power management, sleep, etc.) I will keep mine set to the Pegasusq governor unless I am running a benchmark, in that case, use perfomance (which locks the device to full speed and all 4 cores online)
Sampling Rate - how often the device will 'think' about changing the CPU speed. I have mine set to 15000 uS (15 milliseconds) so it is more responsive.
Sampling Down Factor - This enables you to create 'lag' when the device is at full speed, so it doesn't jump down frequencies when you don't want it to. I leave mine at default 1 sample, because I see no need for this.
Up Threshold - When a core hits this % utilization at a set frequency, then it will scale up to the next frequency. I have mine set to 96%, so the device will scale up slower and more reliably (keep in mind it makes this decision every 15 milliseconds.)
Down Differential - When the device scales down, (drops frequency) it must get below this % utilization to scale down ( UP THRESHOLD minus DOWN DIFFERENTIAL ) I have mine set to 5%, so it drops frequency at or below 91% utilization.
Frequency for Responsiveness - This helps keep the device smooth at lower frequency, and when the frequency is below the set spot, it will use a DIFFERENT up threshold so the device scales up faster and doesn't lag. My frequency setting is 500mHz, and the up threshold for it is set at 70%.
Frequency for Fast Down - this sets the frequency at which the device can use aggressive down scaling, much like the opposite of frequency for responsiveness. I have mine set to 1400mHz, and the up threshold is set to 98%, so the device only scales up if it really needs to.
Frequency Step - This applies to the Fast Down setting, and whenever the device gets above 98% utilization, then it will increase the frequency by a SET percentage of the maximum frequency. So if you set 10%, and are have 1800mHz max, it will increase to the closest step that adds 180mHz. I have mine set to 6%, so it increases by 108mHz.
The up threshold and frequency step decrease confuse me for this, but I have the up threshold set to 2%, and the frequency step set to 3%.
I didn't touch the flexrate settings, as everything else should control this area.
CPU Hotplug - This section will control how the device turns its cores on and off.
CPU Up Rate - How many samples you want to take until a core decides to turn on. (Sampling rate times your setting) I have mine set to 12, so if the conditions are correct, it takes 180 milliseconds to turn a core on.
CPU Down Rate - How many samples you want to take until a core decides to turn off. (Same thing as CPU up rate) Mine is set to 10, so it takes 150 milliseconds to turn off a core if it isn't being used.
Core Upbring Count - How many cores you want to bring online when the conditions are right. Mine is set to 1, I'm sure more will increase performance and hurt battery life.
Configuration Overrides - These can set you device to always have a certain amount of cores online, I don't use them (leave at 0.)
Hotplug Conditionals - These perameters are set to control when the cores turn on and off. Below are MY values
Hotplug 1 Core to ONLINE (make 2 cores online) - 600mHz
Hotplug 2 Cores to OFFLINE (make 1 core online) - 500mHz
Hotplug 2 Cores to ONLINE (make 3 cores online) - 700mHz
Hotplug 3 Cores to OFFLINE (make 2 cores online) - 600mHz
Hotplug 3 Cores to ONLINE (make 4 cores online) - 800mHz
Hotplug 4 Cores to OFFLINE (make 3 cores online) - 700mHz
The rest of this section, I left at DEFAULT values, because I did not understand them.
GPU - This section controls the frequencies and voltages of your GPU.
Maximum Frequency - How high you want your GPU to clock to, mine is set to 733mHz.
Minimum Frequency - How low you want your GPU to clock to, mine is set to 108mHz.
Up Threshold - Like the CPU setting, the percentage of utilization you achieve before the GPU scales up. Mine is set to 90%.
Down Differential - When you want your GPU to scale down lower, (Up threshold minus down differential.) Mine is set to 10%, so when the GPU hits 80% utilization on a speed, it drops to a lower frequency.
Utilization Timeout - Basically is the sampling speed of the GPU (how fast you want it to make decisions to change speed.) Mine is set to 25 milliseconds.
Voltages - Test these the same way as the CPU, get a GPU stress testing app, and set a certain frequency. When you see artifacts or glitches on your screen, then the voltages are too low. Below are MY values.
54mHz - 825mV
108mHz - 875mV
160mHz - 950mV
266mHz - 975mV
350mHz - 1050mV
440mHz - 1100mV
533mHz - 1125mV
640mHz - 1150mV
733mHz - 1175mV
800mHz - 1200mV (This clock speed proved to be slightly unstable at 1175mV, though still usable)
I/O section - These values/settings control how your device writes/reads things from the SD card, or internal storage.
I left both of my storage schedulers at ROW but you can change them and play around. I believe that deadline is the best for overall performance, but can be unstable sometimes.
I/O Read Ahead - These control the cache file on the internal/external storage. I have my internal set to 1536kB, and external set to 2048kB, because those values gave me overall good write/read speeds.
Dynamic Fsync - From what I know, this helps keep the data from being corrupted by creating a buffer between data being written and the storage. Correct me if I'm wrong. I kept it enabled.
The entire audio section is pretty self explanatory, and I'm getting tired of typing all of this, so if you need help, PM me or comment.
Again, take this entire post with caution. What works with my device, may make yours unstable. I only provided mine to give you a baseline, my values offer good performance and battery life anyways. Feel free to correct any of my errors by PM or comment, and I will gladly change my post to accommodate for my errors.
Here's my more performance oriented settings. Averages 19500 on Antutu, and 7400 on Quadrant Standard (Advanced version adds 1000 to score) This doesn't lag at all between screens, animations, etc. The only lag I've seen is when my apps rarely crash.
CPU Max - 1800mHz
CPU Min - 200mHz
Voltages from OP
Pegasusq governor
Sampling Rate - 15000uS
Sampling Down Factor - 1
Up Threshold - 90%
Down Differential - 10%
Frequency for Responsiveness - 600mHz
Up Threshold @ Min Freq - 60%
Frequency at Fast Down - 1400mHz
Up Threshold at Fast Down - 94%
Frequency Step - 25%
Up Threshold Differential - 5%
Frequency Step Decrease - 10%
Flexrate Enabled - 700mHz, 10000uS
CPU Up Rate - 8 samples
CPU Down Rate - 10 samples
Core Upbring Count - 1
*Default Configuration Overrides*
1 Core to Online - 300mHz
2 Cores to Offline - 200mHz
2 Cores to Online - 400mHz
3 Cores to Offline - 300mHz
3 Cores to Online - 500mHz
4 Cores to Offline - 400mHz
*Runqueue Depths*
1 Core to Online - 155
2 Cores to Offline - 155
2 Cores to Online - 250
3 Cores to Offline - 250
3 Cores to Online - 340
4 Cores to Offline - 340
CPU Online Load Bias - 2 cores
CPU Online Bias Up Threshold - 50%
CPU Online Bias Down Threshold - 30%
GPU Max - 733mHz
GPU Min - 160mHz
Up Threshold - 85%
Down Differential - 5%
Utilization Timeout - 25ms
Voltages from OP
Internal/SD Card Schedulers - SIO
Internal/SD Card Read Ahead - 2048kB
Dynamic FSync - Enabled
Hi,
how can I be sure the cpu hoptplug section is turned on?
gannjunior said:
Hi,
how can I be sure the cpu hoptplug section is turned on?
Click to expand...
Click to collapse
The governor, Pegasusq, does the hotplugging. So it's on by default when selecting it. I don't know if it applies to Performance too.
EDIT: Please share the performance oriented profile! What do you mean you need help posting it? You should have reserved another post. But I'm definitely interested!
Thanks for the info OP.
DroidOnRoids said:
The governor, Pegasusq, does the hotplugging. So it's on by default when selecting it. I don't know if it applies to Performance too.
EDIT: Please share the performance oriented profile! What do you mean you need help posting it? You should have reserved another post. But I'm definitely interested!
Click to expand...
Click to collapse
I don't know how to create a flashable zip. I can just post the settings later.
I left my phone unplugged overnight, only lost 2% battery. So it's good with battery too.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Sent from my SCH-I605 using xda premium
Here ya go: [GUIDE] How to make a cwm recovery flashable zip
DroidOnRoids said:
Here ya go: [GUIDE] How to make a cwm recovery flashable zip
Click to expand...
Click to collapse
Thanks. I'll set one up as soon as I get my new computer (Monday) I'll just post my settings in the 2nd comment.
Sent from my SCH-I605 using xda premium
ChaoticWeaponry said:
Thanks. I'll set one up as soon as I get my new computer (Monday) I'll just post my settings in the 2nd comment.
Sent from my SCH-I605 using xda premium
Click to expand...
Click to collapse
I appreciate the performance settings! Really notice a difference!
I'm just going to bump this. People should take a look at this! You did a really good job with it!
Ive been using your Performance profileall week and loving it! Great work
I have also had very good luck with the OPs settings.
I didn't think my phone would even handle voltage settings this low, but it's been perfectly stable for the past 2 days.
ChaoticWeaponry said:
Here's my more performance oriented settings. Averages 19500 on Antutu, and 7400 on Quadrant Standard (Advanced version adds 1000 to score) This doesn't lag at all between screens, animations, etc. The only lag I've seen is when my apps rarely crash.
CPU Max - 1800mHz
CPU Min - 200mHz
Voltages from OP
Pegasusq governor
Sampling Rate - 15000uS
Sampling Down Factor - 1
Up Threshold - 90%
Down Differential - 10%
Frequency for Responsiveness - 600mHz
Up Threshold @ Min Freq - 60%
Frequency at Fast Down - 1400mHz
Up Threshold at Fast Down - 94%
Frequency Step - 25%
Up Threshold Differential - 5%
Frequency Step Decrease - 10%
Flexrate Enabled - 700mHz, 10000uS
CPU Up Rate - 8 samples
CPU Down Rate - 10 samples
Core Upbring Count - 1
*Default Configuration Overrides*
1 Core to Online - 300mHz
2 Cores to Offline - 200mHz
2 Cores to Online - 400mHz
3 Cores to Offline - 300mHz
3 Cores to Online - 500mHz
4 Cores to Offline - 400mHz
*Runqueue Depths*
1 Core to Online - 155
2 Cores to Offline - 155
2 Cores to Online - 250
3 Cores to Offline - 250
3 Cores to Online - 340
4 Cores to Offline - 340
CPU Online Load Bias - 2 cores
CPU Online Bias Up Threshold - 50%
CPU Online Bias Down Threshold - 30%
GPU Max - 733mHz
GPU Min - 160mHz
Up Threshold - 85%
Down Differential - 5%
Utilization Timeout - 25ms
Voltages from OP
Internal/SD Card Schedulers - SIO
Internal/SD Card Read Ahead - 2048kB
Dynamic FSync - Enabled
Click to expand...
Click to collapse
Are your settings similar to any of the flashable profiles listed under Perseus kernel?
GermanGuy said:
Are your settings similar to any of the flashable profiles listed under Perseus kernel?
Click to expand...
Click to collapse
Somewhat. I edited most of the settings.
Sent from my SCH-I605 using xda premium
This gave me the perfect reason to use multi window, no wonder why this phone doesn't have a dedicated recents button!! Looking forward to testing this.
Sent from my SCH-I605 using Tapatalk 2
jsminnis said:
This gave me the perfect reason to use multi window, no wonder why this phone doesn't have a dedicated recents button!! Looking forward to testing this.
Sent from my SCH-I605 using Tapatalk 2
Click to expand...
Click to collapse
Omg bro lmao I just noticed what you meant about the multi window wow I totally forgot about that lmao I just finished setting up these settings but my dumb ass wrote all those settings from the OP to 2 pieces of paper wow what a retarded move I just pulled ha ha ha.
Sent from my SPH-L900 using Tapatalk 2
yellowman82 said:
Omg bro lmao I just noticed what you meant about the multi window wow I totally forgot about that lmao I just finished setting up these settings but my dumb ass wrote all those settings from the OP to 2 pieces of paper wow what a retarded move I just pulled ha ha ha.
Sent from my SPH-L900 using Tapatalk 2
Click to expand...
Click to collapse
Lmao, i dreamed of situations like these when I knew I was getting this phone.
Anyway, about the settings. I recommend not setting on boot till you've had the screen of for awhile. I got a boot loop, most likely from the voltage settings so I will play with those some more.
Tip: If you get a bootloop, instead of pulling the battery just wait for when the phone restarts then press and hold vol up, home and power to go to recovery. I do this rather than taking the back off and risking breaking the little clips like I did on my nexus.
Sent from my SCH-I605 using Tapatalk 2
jsminnis said:
Lmao, i dreamed of situations like these when I knew I was getting this phone.
Anyway, about the settings. I recommend not setting on boot till you've had the screen of for awhile. I got a boot loop, most likely from the voltage settings so I will play with those some more.
Tip: If you get a bootloop, instead of pulling the battery just wait for when the phone restarts then press and hold vol up, home and power to go to recovery. I do this rather than taking the back off and risking breaking the little clips like I did on my nexus.
Sent from my SCH-I605 using Tapatalk 2
Click to expand...
Click to collapse
Thanks for the tip but instead of a bootloop my phone just frozed so I had to do a battery pull and about the voltages you have to increase back up a bit when playing with them right?
Sent from my SPH-L900 using Tapatalk 2
yellowman82 said:
Thanks for the tip but instead of a bootloop my phone just frozed so I had to do a battery pull and about the voltages you have to increase back up a bit when playing with them right?
Sent from my SPH-L900 using Tapatalk 2
Click to expand...
Click to collapse
Yes. Crashes are usually from too low of voltages. Go up a step or two from my settings.
Sent from my SCH-I605 using xda premium
thanks for the tweak using it now, very fast.