http://forum.xda-developers.com/showthread.php?t=1297619
Has anyone tried this?
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akira02rex said:
http://forum.xda-developers.com/showthread.php?t=1297619
Has anyone tried this?
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Click to collapse
Completely different architecture, and our device has no problems hotplugging in the second core when needed. If anything, it fires up the second core TOO soon and eats battery. Which is why airghi has a ton of patches that affect when CPU1 gets onlined... I've been working on cherry-picking some of them already.
Actually, those tweaks won't even work when the kernel is handling hotplugging of the second core.
I monitored the cores with system panel and noticed the second core comes alive just by touching the screen.
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akira02rex said:
I monitored the cores with system panel and noticed the second core comes alive just by touching the screen.
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Yup, as I said - it tends to fire up a little too rapidly.
The second core being enabled actually saves battery life. Differences between voltage and frequency (clock speed) are not linear, so by using two cores at 250mhz it uses less power than one at 500mhz. Using two cores is a good thing.
Related
What's the most battery friendly kernel?
I'm using nymphetamine.. what about you?
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In order to determine this one must flash all kernels and test each of them with the same ROM for a minimum period of 24 hours and then when they have finished that post their results.
For the record im using Franco kernel.
No doubt. Insecure kernel
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I'm using postinthewrongsection kernel.
It's the ****.
Smh...
Seriously, nobody can answer this question and yet it is still asked 20 times a week, best rom, best kernel, best modem, whatever.
It's completely subjective!!
What is good for you might be **** for someone else.
As jonny68 said already, try them out.
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nodstuff said:
I'm using postinthewrongsection kernel.
It's the ****.
Smh...
Seriously, nobody can answer this question and yet it is still asked 20 times a week, best rom, best kernel, best modem, whatever.
It's completely subjective!!
What is good for you might be **** for someone else.
As jonny68 said already, try them out.
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I haven't seen that, where can I download the postinthewrongsection kernel?
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Thread closed.
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brian6685 said:
I haven't seen that, where can I download the postinthewrongsection kernel?
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LOL!!!
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Tbh i would recommend any custom kernel that allows you to undervolt, i.e Siyah
i currently have my phone running 100mv below stock and my battery life is better than it was stock
Uv is useless in s3 seriouzly. How much can u save.
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Well think about it, 4 cores consuming 1400 millivolts each.
Undervolt by 100 millivolts and you have saved the equivalent current of 400 millivolts (100 per core).
Thats close to a third of the total consumption of one stock core.
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Undervolting is pointless unless you are planning on overclocking and want to reduce heat.
Battery savings from Undervolting are about 2-3%
This is insignificant and isn't worth the potential instabilities.
Plus it's not even a big consumer of power, The power the cpu uses is dwarfed by everything else in the phone.
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wong section. please ask Q in Q&A subforum
nodstuff said:
Undervolting is pointless unless you are planning on overclocking and want to reduce heat.
Battery savings from Undervolting are about 2-3%
This is insignificant and isn't worth the potential instabilities.
Plus it's not even a big consumer of power, The power the cpu uses is dwarfed by everything else in the phone.
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The CPU is still the largest consumer of power unless you have extremely bright colours showing on the screen. Plus the phone can be undervolted very far below stock settings as it is, so savings should be more than what you quoted. For gaming I'd say my mali patch would bring quite some advantage in terms of power, since the CPU lock is gone and ASV scaling on the GPU can actually take place now, Netarchy already included that into Ninphetamin.
woshiahboi said:
Thread closed.
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lol.. how'd that work out for ya
AndreiLux said:
The CPU is still the largest consumer of power unless you have extremely bright colours showing on the screen. Plus the phone can be undervolted very far below stock settings as it is, so savings should be more than what you quoted. For gaming I'd say my mali patch would bring quite some advantage in terms of power, since the CPU lock is gone and ASV scaling on the GPU can actually take place now, Netarchy already included that into Ninphetamin.
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Somewhere on XDA I've been reading about some1 testing high (nearly max) voltages against as low as possible voltages (but if I remember correctly it has been a single core CPU). His result of this test was that even with such extreme voltage differences he was not able to save one percent of battery.
While I'm not too much into CPU voltages and undervolting I can't say anything about it for sure. But I'll be looking for that article...
swent said:
Somewhere on XDA I've been reading about some1 testing high (nearly max) voltages against as low as possible voltages (but if I remember correctly it has been a single core CPU). His result of this test was that even with such extreme voltage differences he was not able to save one percent of battery.
While I'm not too much into CPU voltages and undervolting I can't say anything about it for sure. But I'll be looking for that article...
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Click to collapse
I think I know what thread you are talking about and I completely disagree with those findings, at least on the S2 I did proper measurements myself with -100mV on various frequencies and the power advantage was almost equal to the CMOS power formula f*V² on full load applications. I advise people to stop comparing such articles from different architectures as the Snapdragons or the OMAPs as they have different types of power saving states which influence the measurements greatly. The Exynos is relatively "stupid" in terms of lower power states and relies heavily on DVFS scaling so voltage brings a greater effect on the dissipation.
hefonthefjords said:
Well think about it, 4 cores consuming 1400 millivolts each.
Undervolt by 100 millivolts and you have saved the equivalent current of 400 millivolts (100 per core).
Thats close to a third of the total consumption of one stock core.
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If you're so concerned with volts per core. Buy the North American version and run it on 2g lol
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Yeah well, I'm sorry if I complicated things. Just thought it's worth pointing out.
For anyone still interested: here
Probably you're right, as I said... can't argue with any of it and hopefully no1 takes my dangerous semi-knowledge as reference.
AndreiLux said:
I think I know what thread you are talking about and I completely disagree with those findings, at least on the S2 I did proper measurements myself with -100mV on various frequencies and the power advantage was almost equal to the CMOS power formula f*V² on full load applications. I advise people to stop comparing such articles from different architectures as the Snapdragons or the OMAPs as they have different types of power saving states which influence the measurements greatly. The Exynos is relatively "stupid" in terms of lower power states and relies heavily on DVFS scaling so voltage brings a greater effect on the dissipation.
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Well you learn something new every day! Thanks Andreilux :thumbup:
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swent said:
Yeah well, I'm sorry if I complicated things. Just thought it's worth pointing out.
For anyone still interested: here
Probably you're right, as I said... can't argue with any of it and hopefully no1 takes my dangerous semi-knowledge as reference.
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Click to collapse
This is the same study I saw while I was using nexus s.
Tbh I completely ignored the fact that it was single core and different architecture when applying that info here. Oops.
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Is there any app that can turn off cores manually on the S3? 2nd core doesn't work and Cpu sleep seems very useless because I can't turn off cores while actually using my phone. An app like 2nd core for a quad core cpu would be greatly appreciated.
Thanks.
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pegasusq (the scheduler) doesn't turn cores on and off based on whether the phone's screen is on, but based on the CPU usage.
So it actually does everything you need by itself; if it's sitting idle it will turn off cores, whenever you need the horsepower it turns them back on.
Siyahkernel with Extweaks allows you to force it down to 2 or 3 cores, however I wouldn't do it. Rather play with ExTweaks to have it turn the other cores on when the load is higher.
If you don't want to use the extra cores, why didn't you just buy a galaxy s2 instead?
d4fseeker said:
pegasusq (the scheduler) doesn't turn cores on and off based on whether the phone's screen is on, but based on the CPU usage.
So it actually does everything you need by itself; if it's sitting idle it will turn off cores, whenever you need the horsepower it turns them back on.
Siyahkernel with Extweaks allows you to force it down to 2 or 3 cores, however I wouldn't do it. Rather play with ExTweaks to have it turn the other cores on when the load is higher.
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Click to collapse
Yeah but on my S2 I found that using 2nd core and turning it to single core usage it would give almost the same performance if I just boosted cpu by 200mhz. So do I need the siyahkernel or is there a core turn-off app for ninphettamin kernel?
Sorry for late reply I was abroad.
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krico said:
If you don't want to use the extra cores, why didn't you just buy a galaxy s2 instead?
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I had the s2 but it feel in the toilet so GTFO?
Cheers.
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gjunki said:
I had the s2 but it feel in the toilet so GTFO?
Cheers.
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it was a legitimate question mate, no need to snap. On topic, the phone really should do that on its own and handles all the processes just fine. I don't think youd even WANT to have to manually change there core usage, that's a hassle. I'm sure there are plenty of great custom kernel s as the previous posts have mentioned that improve off of stock greatly though
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There is no need for installing anything that enables or disables cores, let android take care of that. Not all cores will be initiated when mailing, texting or calling. Only when they have to. It`s like using these stupid task managers that mess up android task management. Let it go unless you know what you are doing. No disrespect but only noobs come up with these ideas.
Pegasusq does all the work, users need not apply. (Seriously)
If you need to ask this question then you need to leave the system alone.
Stick to playing games
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Bumping here, but wow. Since when did XDA disencourage modding and developing?
MaXmeOliver said:
Bumping here, but wow. Since when did XDA disencourage modding and developing?
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Click to collapse
Custom Kernel. Limit cores and problem solved.
I use Perseus and Siyah with STweaks.
gjunki said:
Is there any app that can turn off cores manually on the S3? 2nd core doesn't work and Cpu sleep seems very useless because I can't turn off cores while actually using my phone. An app like 2nd core for a quad core cpu would be greatly appreciated.
Thanks.
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Click to collapse
If you use a kernel with init.d suport you can flash this zip in the recovery.
It disable 3 core's when the screen is off.
Only for JB rom's!!!!
This application works for me https://play.google.com/store/apps/details?id=com.iamaner.CoreDisabler
STweaks - Siyah Kernel
Siyah Kernel will do the job with STweaks.
The last update for SGS3 GT-I9300:
http://forum.xda-developers.com/showthread.php?t=1709686
Why there is not dev try to plug different governor for user?
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I may have this wrong but I have read in earlier posts that the power managment on the tegra 2 is only set to work with the perfomace governor. It was tried with the power save governor but that had no effect and was actually more power hungry. I will try to find those refrences when I finish work.
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thx!
Tegra 2 has a built in hardware governor which is pretty good so there is no need to install software governors, in fact, installing a governor other than performance will impede performance and/or battery life by interfering with the on chip governor.
I believe the Tegra 2 drivers control the CPU speed. It overrides the governor. Performance and powersave are the simplest governors.
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In was just looking into this. I'm on neutrino, and no matter what kernel I seem to have, my CPU is locked to the max frequency. My battery life has been brutal and the phone gets too hot even after sending an email!
What is wrong?
Sorry for the ETA, and but I should be more clear..
When I open setcpu or antutu cpu master, and both report the highest selected cpu frequency constantly no matter what the conditions are.
Is the fact that I'm running a java application to control max frequency interfering with tegra 2's governor? Although I've see screen shots of atrix users in setcpu with the freq being not-the-max-freq.
Thanks for any help!
Note: I only ever have one over clock app installed at a time.
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Nevermind. Just installed milestone 6 and it's working fine.
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Hi, so recently I flashed the Siyah Kernel on my S3 GT-I9300T. I downloaded STweaks so that I can do some tweaks to my S3. Then I went under CPU SCALING SETTINGS and changed the MAX CPU LOCK to single core (so that my S3 would run on 1 core to save more battery), but I was worried if it was going to do any damage to the core if it was under a lot of pressure (like playing heavy 3D games).
Thanks.
Mountain_Lion said:
Hi, so recently I flashed the Siyah Kernel on my S3 GT-I9300T. I downloaded STweaks so that I can do some tweaks to my S3. Then I went under CPU SCALING SETTINGS and changed the MAX CPU LOCK to single core (so that my S3 would run on 1 core to save more battery), but I was worried if it was going to do any damage to the core if it was under a lot of pressure (like playing heavy 3D games).
Thanks.
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This is an insult to the phone... Just keep a charger with you, in your pocket. How can you play heavy 3D games with just a single core
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DarkSofter said:
This is an insult to the phone... Just keep a charger with you, in your pocket. How can you play heavy 3D games with just a single core
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You're insulting my old galaxy s
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Using a single core not only results in lags for obvious reasons but also in higher frequencies.
Since running multiple cores on low frequencies costs less power than running a single core on full frequency you are actually provoking adverse effects
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d4fseeker said:
Using a single core not only results in lags for obvious reasons but also in higher frequencies.
Since running multiple cores on low frequencies costs less power than running a single core on full frequency you are actually provoking adverse effects
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But will it do any damage to the core if I was using single core just for light use, like calling, browsing and messaging etc.? Thanks
no, even if you peg it to 100% it wont "damage" it. There's no point tho. Leave it at quad, power managers shut down the ones you dont need.
I'm just curious to see everyone's experience with the Faux kernel as opposed to the one that comes pre-installed.
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Capgun_Homicide said:
I'm just curious to see everyone's experience with the Faux kernel as opposed to the one that comes pre-installed.
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You have to read xda rules again.. Your free to use both of them and see it for your self without asking which is best in public!!
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Capgun_Homicide said:
I'm just curious to see everyone's experience with the Faux kernel as opposed to the one that comes pre-installed.
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I think they're both great you can't go wrong with either kernel. It's like choosing a lamborgini or ferrari, they're both awesome but it truly comes down to preference.
I think I got better battery with faux 31 but I under clocked and undervolted so I can't do a fair battery life test.
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SuperAfnan said:
I think they're both great you can't go wrong with either kernel. It's like choosing a lamborgini or ferrari, they're both awesome but it truly comes down to preference.
I think I got better battery with faux 31 but I under clocked and undervolted so I can't do a fair battery life test.
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I've noticed better battery life as well; not majorly, but noticeably. Although I feel it also has a little perfomance drop. Could just be me, though.
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Sorry for a question within a question, but what does undervolting/overvolting do? I've only ever tampered with MHz frequencies.
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Capgun_Homicide said:
Sorry for a question within a question, but what does undervolting/overvolting do? I've only ever tampered with MHz frequencies.
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Don't worry.
Undervolting is basically adjusting the voltages so the cpu uses less voltage aka electricity. It helps a little but it can make your phone unstable so watch out. Of you undervolt use the system tuner app on the market. You should definitely under clock if you want to save power too. When you undervolt be sure to underclock, and don't do it too low or your phone might freeze! That's why your shouldn't go so extreme on it.
Overvolting is basically adding more voltage to the cpu. There is no point in doing it for our amazes to be honest. It is already a battery hog. I guess it can help if you want to over clock a lot but there is absolutely no point in doing that.
In older legacy phones if you wanted to over clock because the cpu would be so weak, like 600mhz then you would have to overvolt to over clock to like 1ghz if you were lucky. Our devices are 1.5 ghz dual core and sense isn't THAT bad. There's no point in doing overvolt in this phone though.
PS, check out my rom in the development section.
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SuperAfnan said:
Don't worry.
Undervolting is basically adjusting the voltages so the cpu uses less voltage aka electricity. It helps a little but it can make your phone unstable so watch out. Of you undervolt use the system tuner app on the market. You should definitely under clock if you want to save power too. When you undervolt be sure to underclock, and don't do it too low or your phone might freeze! That's why your shouldn't go so extreme on it.
Overvolting is basically adding more voltage to the cpu. There is no point in doing it for our amazes to be honest. It is already a battery hog. I guess it can help if you want to over clock a lot but there is absolutely no point in doing that.
In older legacy phones if you wanted to over clock because the cpu would be so weak, like 600mhz then you would have to overvolt to over clock to like 1ghz if you were lucky. Our devices are 1.5 ghz dual core and sense isn't THAT bad. There's no point in doing overvolt in this phone though.
PS, check out my rom in the development section.
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I just saw it in Venom Tweaks and was curious. The most I underclock to is 1 GHz; cuts down the CPU maximum by a third and doesn't hinder performance to much. What voltage would you recommend at that clock speed?
P.S. I have I plan on flashing it to try it out when I get WiFi access. Trying to cut down data usage since I don't have WiFi at home.
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Capgun_Homicide said:
I just saw it in Venom Tweaks and was curious. The most I underclock to is 1 GHz; cuts down the CPU maximum by a third and doesn't hinder performance to much. What voltage would you recommend at that clock speed?
P.S. I have I plan on flashing it to try it out when I get WiFi access. Trying to cut down data usage since I don't have WiFi at home.
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1ghz is perfect. As for voltage it really varies but I subtract 75 or 50 mv from all voltages.
PS. Oh nice, hope you get wifi soon then.
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