What's the purpose of overclocking and undervolting. What's the reason for the undervolting?
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It reduces CPU temperature and the amount of battery needed. It is especially useful when you overclock your CPU as both benefits are seen then.
Undervolting typically increases instability, unless it is also in conjunction with underclocking.
If you overclock, you might add voltage to keep the processor running higher than its rated speed. Similarly, if you drop the clock cycles, you may be able to drop voltage and run a cooler, more power-friendly processor.
I am currently underclocking to 768MHz on stock voltage.
Is that why with the speedtweak on 1.92 with the under volting makes the phone lock up.
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Likely. The only time I experienced frequent locks was when I was undervolted extremely. If you're running an overclocked and undervolted simultaneously you increase the odds that the cpu won't have enough juice to run properly.
Virtually every device will tolerate speedtweak's extreme undervolt/overclock to 1.41GHz with complete stability. Most will also remain stable running within stock voltage up to 1.222GHz. I've never been a fan of running with a hard cap on speed. Adjusting governor settings makes more sense. I'm also thinking underclocking and using HTC stock voltage scaling is a waste since the CPU will definitely remain more stable at more extreme undervolting at those speeds. Some kernels will run well with a minimum voltage of 650.
Related
Sorry I've searched around. Can someone explain what smartass does ? On a kernel or how it interacts?
Interactive set up also?
Using adryn bamf rom 1.3. This is my first time messing with setcpu. He said to set it back to 1ghz is to use it but it only goes to 1032 close to 1. I don't really like overclockihg since the phone is fast as it is. Sorry for the noobish question thx again.
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In a nutshell, smartass is a type of governor that controls the scaling of the procesor speed and controls the idle loop.
What does a governor do? Well, while a processor may be rated at 1.0 GHz, it is not runnng at full speed all the time. It only runs at that full 1.0 when called upon to do so for various intense functions and calculations. The rest of the time, when the phone isn't required to be doing much, the processor "underclocks" itself to conserve power, minimize heat, and prolong the life of the chip. It's like driving a car: You don't floor the gas pedal and constantly keep the engine at 8,000 RPM all day, and so it is with processor scaling.The governor is what controls this latter part. And there are several different types of governors out there that control the scaling in different ways
Interactive is one type of governor that takes command of the idle loop. Smartass sort of doubles down on that same concept, but is more responsive. Smartass also allows for the kernel to cap the max frequency when the phone is sleeping (screen off). This prevents the need to create sleep profiles while reducing power draw, so it improves battery life
While we're on the subject, a few other terms you may want to know since you'll start seeing them soon are BFS (brain f-ck scheduler - pardon the french) and CFS (completely fair scheduler). These are two types of task schedulers that linux kernels use to control task management. Again, in a nutshell, BFS generally is faster, but lags when multitasking, while CFS is slightly slower, but can handle multitasking a little better
Hey thankbyou bro for taking time to explain this. I really appreaciate it. Now I can set up setcpu and actually understand some terms lol. Thx
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What are the best settings to have you phone's CPU speed set at? I'm looking for both good performance and good battery. Also I am using the default overclocker, what is the best one? Thank you guys for your time.
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I use SMARTASS as my CPU speed governor and I set my CPU to 480-748 MHz, seems pretty stable for me.
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thaunknownartist said:
What are the best settings to have you phone's CPU speed set at? I'm looking for both good performance and good battery. Also I am using the default overclocker, what is the best one? Thank you guys for your time.
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Overclocking values differ from phone to phone. Test it out with different values and use the one which is stable for you.
This was just discussed in the IHO technical-discussion thread, as a matter of fact.
My phone is stable for most stuff at 806 MHz, but sometimes the camera will cause a freeze/reboot. So I run at a 786 MHz max. Your phone will be different; this has to do with minute physical differences between individual chips.
The thing to keep in mind when overclocking is that the processor in our phone (unlike those of many other phones) does not make use of dynamic voltage scaling. There are only two voltage levels: a lower one if the phone is running at or below (or is it just below? correct me if I'm wrong, guys) 480 MHz, and a higher one if the phone is running above. So below 480 MHz, the system will give the processor a certain amount of voltage (period), and above, the processor will get a certain higher amount of voltage (period).
Because of that, the tests that have been done indicate that 806 MHz is the sweet spot for battery efficiency when the phone is in use--and the closer you get to 806, the better. Thus, I've had the following settings for quite some time:
786 MHz min
786 MHz max
Performance governor
which has treated me pretty well. On a day of light to moderate use, I'd end up with 65-75% battery left (occasionally more like 80%), depending on cell signal where I am et al. And it gives me probably the best performance I'm gonna get out of this phone.
However, I very recently decided to change the minimum to below that 480 MHz threshold and see what a lower voltage when idling would do for my battery life. My current settings are:
320 MHz min (may change to 480)
786 MHz max
Smart*** governor
There is actually a noticeable performance decrease when I first wake the phone up, so I may switch governors as well. In any case, I've had those settings for only one full day now, but for that one day the battery life was noticeably better. I'll post an update when I've had a few more days to test.
As always, it's difficult to quantify battery life in a reliable/rigorous manner (much less a universally applicable one), so YMMV.
Has anyone damaged there s2 from undergoing?
Is there a possibility that you can damage your phone from undervolting?
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davegermiquet said:
Has anyone damaged there s2 from undergoing?
Is there a possibility that you can damage your phone from undervolting?
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It's a good experiment but the processor may be pushed into an usafe operating area where some people may find theirs can't cope. If it was safe the manufacturers would be doing it as standard. Don't do it if you need it to be 100% reliable. As an experiment it's very interesting and may give some worthwhile gains.
It's not going to be laggy but if you can stand a reduction in performance then slowing the clock speed is a safer way to save battery, rather than reduced voltage.
---------- Post added at 09:55 AM ---------- Previous post was at 09:44 AM ----------
Overclock and overvolt terms are very common on computer PC. However, this will increase power usage and generate more heat. Not so good to try it on smartphone. So the other ways ~ underclock and undervolt should be better on smartphone like Samsung Galaxy S II, right? Yes, to improve battery life. Underclock may not be so efficient in performance / walt ratio. But undervolt surely will improve battery life while maintain the overall performance speed.
For example, by underclock from 1.2 GHz to 1 GHz, speed performance drops 16.67% but voltage usage drops 6% only from 1250 mV to 1175 mV. Therefore, it is better to just undervolt only and keep the highest speed stage. Let’s say by reducing voltage from 1250 mV to 1150 mV at 1.2 GHz speed stage, you will get 8% voltage usage reduction while maintaining 1.2 GHz speed.
How to undervolt Samsung Galaxy S2?
1.Install custom kernel that support undervolt.
2.Install SetCPU.
3.At Voltages tab, select the desire value for each speed stages.
4.Note – try to reduce 25 mV each time.
5.Click Apply then.
6.Run Stress test ~ Stress CPU to test stability (located at Info tab).
7.That’s all.
Note – Only check ‘Set on Boot’ when you are confident that the undervolted values won’t hang and stable all the time.
Each phone has its own CPU chipset. Other people’s SetCPU voltages settings may not work for you. Therefore, you need to try lot of the settings until you get the lowest voltages and stable for daily use.
Yes. But is there potential that it will damage the phone permanently? Can it wreck the cpu?
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Very unlikely. You are far more likely to damage your phone/reduce the life of the CPU by overvolting/overclocking (logical).
Most damage is caused by users not bothering to read and follow instructions/stickies etc exactly.
Can't see electronically how UV would cause any damage to semiconductor components or electrical circuits. Maybe software issues caused by freezing or forced reboot or battery pull though.
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Main "potential danger" issue with UV, aside from poor stability and pointless "gains", is the CPU may write bad data to memory (volatile OR non-volatile) causing corruption. This can be recovered, generally, but not if it writes rubbish to the low level "boot" areas.
just dont set the voltage tweaks on boot so if you settings goes wrong
your phone restart and its back to stock voltages
than you can try new settings
i have UV mine from the kernel test thread values and its smooth and battery life is improved
First off is this a good idea? can such small devices be over clocked in a safe way without risking damaging the hardware?
if yes which would you say was the best app for doing so?
Hi,
A good idea... maybe, maybe not... it depends on what you want... higher scores in bench?A shorter battery life?A very very hot device while browsing or gaming (if you run at 1.8Ghz for example)?A little extra power for some apps/games?
With overclocking a little (1.5/1.6Ghz) I noticied that some apps open a little faster and the genera UI is a little more responsive...
There is always a (little) risk to overclock our phones, generally due to overheat but also some CPU's can't handle high overclock.
For me I don't remember reading someone burn her CPU with overclocking but...
There are still some software protections before to burn a CPU (thermal throttling, CPU temp limit before shutdown, etc...).
Obiously the duration of life could be reduced mainly if you always run at 1.8Ghz with playing games... So the "safe" way would be no overclock or a little overclock like 1.5Ghz... For you to test and decide...
For the apps: SetCpu, System Tuner... there is a bunch on the Play Store.Just for the CPU settings I would say SetCpu.
For me i will never overclock my cpu. Just install siyah kernel and it's pretty smooth in games. Overclocking will damage your cpu and maybe loose some of the performance.
I can't see the need on this device, I might experiment with uv, maybe even underclocking, but as above, super smooth on siyah, and Slim Rom
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Talking about battery life i installed darkys rom 3 onto my i9300 and the battery life is already suffering a loss of maybe around 25%. In saying that over clocking will only cause me to lose even more so ill leave it for now
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I'm too running on slim ics and siyah kernel. Best battery life and performance!
GGSunny12 said:
For me i will never overclock my cpu. Just install siyah kernel and it's pretty smooth in games. Overclocking will damage your cpu and maybe loose some of the performance.
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Overclocking won't damage your CPU unless you set crazy voltages, or let it overheat. Also, it won't lose performance... that's crazy talk. Only if it overheats will it throttle, but that only happens on large clock rates like 1.8GHz or if you're in a hot environment.
I had my old LG GT540 overclocked with no heat problems mind that was only a 600mhz cpu, had it up to 825mhz.
But we already have a powerful cpu in this phone, foe now I don't see the need to overclock.
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The best app depends a lot on your kernel and device. For example, for my Galaxy S2 the best OC was with TegraK Overclock.
With my Xoom CPU Tuner is still the best.
With the S3 I suppose CPU tuner would be alright as well, but I haven't had the urge to OC it, because I find SiyahKernel still quite unstable in the S3.
You need an overclockable kernel in order to OC your phone.
As for damages, it is hard to tell if they are permanent, but picture this: your battery will have to be recharged more often, because it will drain faster. Since batteries have a limited lifespan which depends on how many charge cycles they go through, the more often you discharge/charge them, the shorter their lifespan will be.
Also, there is no telling what kind of ill-effects the added heat can do to the phone. It may be totally harmless, but it may also affect the quality of the display, since the added heat will be right underneath the screen.
The lifespan of the CPU will be shortened: instead of being able to work well for 20 years, it will work well for 18, 17, 15, but more than enough time for us to already have replaced our S3 for organic, intradermal smartphones!
What is the difference between undervolting and underclocking? What does each do to battery life, performance, etc.
Also, what are the best, stable undervolting and underclocking value for the Rezound? I'm running Neo's Tron rom
gleggie said:
What is the difference between undervolting and underclocking? What does each do to battery life, performance, etc.
Also, what are the best, stable undervolting and underclocking value for the Rezound? I'm running Neo's Tron rom
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Click to collapse
Undervolting is lowering the amount of power the processor draws at a certain frequency. Let's say, for example, a processor uses 1025mV at 1.18GHz normally. If you lower the voltage to 975mV for that frequency (using System Tuner or something similar) that's undervolting. If you lower the voltage too much the device will be unstable and reboot.
Underclocking is lowering the top speed of a processor. On our Rezound, the maximum speed of our processor is 1.5GHz stock. If you lower the maximum speed to 1.18GHz that's underclocking. Obviously lowering the maximum speed of the processor will decrease the performance of the device somewhat, depending on how much you lower it and what you're doing. Just getting on Twitter and XDA you might not notice the difference in speed, but during gaming it'll become more prevalent.
There isn't an established "best" amount to undervolt by, as each device is different. One device might be able to undervolt by 50mV with no problems, while another might not be able to handle any undervolting at all. If you're using the latest version of TRON ROM you should already be on Snuzzo's FunkyBean kernel, which has been undervolted by 50mV at every frequency.
Undervolting is also a subjective thing. Some people choose to go with 1.18GHz, while others may choose something higher than that, like 1.35GHz. It all depends on how you use your device and how you want it to perform. I suggest trying out something around 1.24GHz and seeing if it's alright with you. If it's too laggy just raise the speed bit by bit until you're satisfied with it.
I'm sorry for the long winded reply, but I wanted to make sure I covered everything.
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SteveG12543 said:
Undervolting is lowering the amount of power the processor draws at a certain frequency. Let's say, for example, a processor uses 1025mV at 1.18GHz normally. If you lower the voltage to 975mV for that frequency (using System Tuner or something similar) that's undervolting. If you lower the voltage too much the device will be unstable and reboot.
Underclocking is lowering the top speed of a processor. On our Rezound, the maximum speed of our processor is 1.5GHz stock. If you lower the maximum speed to 1.18GHz that's underclocking. Obviously lowering the maximum speed of the processor will decrease the performance of the device somewhat, depending on how much you lower it and what you're doing. Just getting on Twitter and XDA you might not notice the difference in speed, but during gaming it'll become more prevalent.
There isn't an established "best" amount to undervolt by, as each device is different. One device might be able to undervolt by 50mV with no problems, while another might not be able to handle any undervolting at all. If you're using the latest version of TRON ROM you should already be on Snuzzo's FunkyBean kernel, which has been undervolted by 50mV at every frequency.
Undervolting is also a subjective thing. Some people choose to go with 1.18GHz, while others may choose something higher than that, like 1.35GHz. It all depends on how you use your device and how you want it to perform. I suggest trying out something around 1.24GHz and seeing if it's alright with you. If it's too laggy just raise the speed bit by bit until you're satisfied with it.
I'm sorry for the long winded reply, but I wanted to make sure I covered everything.
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Thanks for the thorough response!