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Hi, all!
Some people, like me, may have downloaded a cpu-monitor app like System Tuner then notice their second cpu (cpu1) always appears offline.
First off, I recently realized that that is often inacurate. Using another app like SystemPanel would show both cpus being online, and more importantly, checking sys/devices/system/cpu/cpu1/online would show it's "1" indicating online. Many cpu app's inability to read cpu1's info is because "cpufreq" folder is missing from cpu1 folder (if you check cpu0's cpufreq folder it's always there).
K, now also, some poeple like me, thought cpu1 was really offline, and used System Tuner's "Force all cpus online" option, and viola, after reboot the second cpu showed up. But why? Cuz a "cpufreq" folder is found in cpu1 again.
What is interesting is both files "affected_cpus" and "related_cpus" would show "0 1" meaning the two cores are in sync and if you change settings(freq,governor,etc) for one core it automatically changes the other.
Now here's the tricky part, however after the tablet goes to sleep, when I wake it, cpu1's "cpufreq" folder would disappear again, meaning Sytem Tuner would show cpu1 agains as "offline". But if you chekc "online" file in folder you'll see it's still online ("1") and SystemPanes still shows cpu1 activity. However "affected_cpus" and "realated_cpus" will show only "0" meaning the two cores are no longer in sync.
Conclusion: so far what I deduced is my tablet in its default state has both cores online, but are off-sync. After turning on "Force all cpus online" and rebooting, they are both online and in-sync. After the device goes to sleep and wake, the two cores are still online but now off-sync.
The important thing about this investigation is how much it affects 3D performance. I was always confused why my device lags with a aged-game like Counter Strike portable but is perfectly smooth in a consol-quality game like Mass Effect Infiltrator. My current thought is Mass Effect acttively tweaks your cpu while most other games leave cpus as they are.
Benchmarking (using market benchmark apps):
(First off, the FPS difference may seem small but in running the actual games for some reason it made a enormous difference, often the difference between crashing and not crashing/playable or unplayable in Nova3/Shadowgun)
Default, newly flashed rom: FPS :33 (Some games fail to load graphics properly for some unknown reason)
Turn on "Force all cpus online" with Sys Tuner: FPS 39-40 (All games are silky smooth, no errors, tablet temp hotter)
"Force cpus online", then after wake from sleep: FPS: 33-34 (not as smooth before sleep, but games generally load properly)
**Switching my cpu0 gonernor to the same governor I think cpu1 is using: FPS 35-37 (no errors, almost as smooth as "Force cpus online")
Here's a crappy surprise --Cpu1 off (turn off dual core): FPS: 39. (Completely smooth, zero errors, hottest tablet temp)
**after cpufreq folder disappears from cpu1 I cannot be sure which governor cpu1 is using, but checked with Kernel Tuner and believe the system switch it back to "performance2" which is a governor foudn in my tablet.(it it not like "performance" governor) upthresh 60 downthresh 30 freqstep 5.
Conclusion:
This leads me to the conclusion that having both cpus online does not necessarily improve performance, but if the two cpus are off-sync it definitely BUTCHERS performance. It does so so badly that running one core is actually better.
Need help:
I hope the info so far may helped some people, but the help I also really need is someone to tell me how are "affected_cpus" and "related_cpus" controled by the system? So far I had no sccucess modding their values and forcing cpus to "sync". I enter "0 1" but it doesn't go through. Since having the cpus in sync seems to give good performance and lower temp (single core was good but temp was noticeably high), I want my cpu cores to remain in sync, but currently it undoes the sync after waking from sleep. I need to understand how and why the system somtimes decides to coordinate both cpus synchronously so both cpus appear under "affected_cpus" and "related_cpus"?
Thanks to anyone for reading!
I am trying to figure all of this out myself and will be performing more tests after I root. Thank you for the info!
Sent from my Nexus 7 using xda app-developers app
exactly same problem here
cpu: AML8726-MX
rom: 4.1.1 official from tabulet beat duos
setting cpu governor for all cores irrespective of their online status
i am stuck at the inability of kernel to allow a one point settting of scaling_governor for all cores. I tried with a for loop to echo, in each core's
cpufreq module, a scaling governor, but failed for offline cores as they have no cpufreq folder when they are offline. I tested cpu tuner app and it does the above said amazingly well. I would like to request anyone to help me in knowing,
how to programatically set cpu governor to all cores irrespective of their online status?
thanking all.
shavi
curiosity
oijjio said:
Hi, all!
Some people, like me, may have downloaded a cpu-monitor app like System Tuner then notice their second cpu (cpu1) always appears offline.
First off, I recently realized that that is often inacurate. Using another app like SystemPanel would show both cpus being online, and more importantly, checking sys/devices/system/cpu/cpu1/online would show it's "1" indicating online. Many cpu app's inability to read cpu1's info is because "cpufreq" folder is missing from cpu1 folder (if you check cpu0's cpufreq folder it's always there).
K, now also, some poeple like me, thought cpu1 was really offline, and used System Tuner's "Force all cpus online" option, and viola, after reboot the second cpu showed up. But why? Cuz a "cpufreq" folder is found in cpu1 again.
What is interesting is both files "affected_cpus" and "related_cpus" would show "0 1" meaning the two cores are in sync and if you change settings(freq,governor,etc) for one core it automatically changes the other.
Now here's the tricky part, however after the tablet goes to sleep, when I wake it, cpu1's "cpufreq" folder would disappear again, meaning Sytem Tuner would show cpu1 agains as "offline". But if you chekc "online" file in folder you'll see it's still online ("1") and SystemPanes still shows cpu1 activity. However "affected_cpus" and "realated_cpus" will show only "0" meaning the two cores are no longer in sync.
Conclusion: so far what I deduced is my tablet in its default state has both cores online, but are off-sync. After turning on "Force all cpus online" and rebooting, they are both online and in-sync. After the device goes to sleep and wake, the two cores are still online but now off-sync.
The important thing about this investigation is how much it affects 3D performance. I was always confused why my device lags with a aged-game like Counter Strike portable but is perfectly smooth in a consol-quality game like Mass Effect Infiltrator. My current thought is Mass Effect acttively tweaks your cpu while most other games leave cpus as they are.
Benchmarking (using market benchmark apps):
(First off, the FPS difference may seem small but in running the actual games for some reason it made a enormous difference, often the difference between crashing and not crashing/playable or unplayable in Nova3/Shadowgun)
Default, newly flashed rom: FPS :33 (Some games fail to load graphics properly for some unknown reason)
Turn on "Force all cpus online" with Sys Tuner: FPS 39-40 (All games are silky smooth, no errors, tablet temp hotter)
"Force cpus online", then after wake from sleep: FPS: 33-34 (not as smooth before sleep, but games generally load properly)
**Switching my cpu0 gonernor to the same governor I think cpu1 is using: FPS 35-37 (no errors, almost as smooth as "Force cpus online")
Here's a crappy surprise --Cpu1 off (turn off dual core): FPS: 39. (Completely smooth, zero errors, hottest tablet temp)
**after cpufreq folder disappears from cpu1 I cannot be sure which governor cpu1 is using, but checked with Kernel Tuner and believe the system switch it back to "performance2" which is a governor foudn in my tablet.(it it not like "performance" governor) upthresh 60 downthresh 30 freqstep 5.
Conclusion:
This leads me to the conclusion that having both cpus online does not necessarily improve performance, but if the two cpus are off-sync it definitely BUTCHERS performance. It does so so badly that running one core is actually better.
Need help:
I hope the info so far may helped some people, but the help I also really need is someone to tell me how are "affected_cpus" and "related_cpus" controled by the system? So far I had no sccucess modding their values and forcing cpus to "sync". I enter "0 1" but it doesn't go through. Since having the cpus in sync seems to give good performance and lower temp (single core was good but temp was noticeably high), I want my cpu cores to remain in sync, but currently it undoes the sync after waking from sleep. I need to understand how and why the system somtimes decides to coordinate both cpus synchronously so both cpus appear under "affected_cpus" and "related_cpus"?
Thanks to anyone for reading![/QUOTthats exactly what happens i reboot,both run i check it again later its offline or uneven,,,,you say tuner,, which tuner are you implying to? Thank u
Click to expand...
Click to collapse
When my Mi4C is cold and I run antutu I get 55-56k scores.
After I play some games for about 5 min one of the processors (A57 1.8 GHz) turns off.
After another 10-15 min of playing any modern game second A57 is off, and I'm left wit 4x 1.4 GHz processors....
Then when I run antutu it only gets around 30-35k scores and I can see while playing that there is lower framerate...
I'm checking processors status in CPU-Z.
My MI4C runs on rooted MIUI 7.0.4.0 stable version.
Anyone got solution for this problem, or is it bad desing of this model?
Do you have a silicon back cover? Anyway it's normal that it's stop the core...
I've recently discovered with kernel auditor that there are various form of thermal protection for the cpu pack, one of them is core control, so it just stop one of the core.
Another one is the well known thermal throttling ...in our case, the kernel is set up for core control so it's normal that it stop one of the core, altough is bit curious the fact that the device with just normal browsing and instant messaging get this hot.
I've opened one thread on the official en forum of miui about this problem just a couple of hours ago.
If you mi4c rooted. Download kernel auditor from playstore, open and find thermal tab ,uncheck "core control" and the open cpu tab , if cpu 4 and 5 was stopped , you can switch on. This can make your device get heat.. Use at you own risk
Some easy but requires root technique:
Open /system/etc/thermalblabla.conf (forgot the name, but there's only 1 file starting with thermal)
Find CPU4 & CPU5 section
Change threshold value somewhere higher. CPU4 default is 42000 while CPU5 is 45000. I add 25° more so at max CPU5 will be as hot as 70° C
Either reboot or restart thermal-engine
Hello,
Mi 4i lags/slows down most of the time, when i check CPU-Z during that time, i can see that only the lower clocked 2/4 cpu cores run constantly at 800 Mhz. It is very difficult to use when it is so slow. Other 4/6 cores remain inactive.
Is there any solution for this weird behavior while running in Balanced mode. Even when switching to Performance mode, nothing changes. I believe due to the heat generated, the OS automatically underclocks the CPU. I have already rooted and tried changing the CPU Governor, Clock speed but it resets to default every time. Sometimes i am unable to change that too.
Thank you.
There's a configuration that does this, just try to use the provided tweaks available here and then configure the phone's cores and so manually.
http://en.miui.com/thread-140563-1-1.html
I tried tweaking the thermal config using the above thread. But still only four cores are active @ 800 Mhz. The phone is so lagging that it is not usable at most of the time. Unable to change governor in any CPU clocking app, turn on the other cores. If you can help me out, please let me know.
Thanks.
Hackerpunk1 said:
There's a configuration that does this, just try to use the provided tweaks available here and then configure the phone's cores and so manually.
Click to expand...
Click to collapse
Might be a bug. Try a clean install and see
Same here
I am having a similar issue, very frustrating. I tried Sensei kernel, but no luck
i don't know what do you mean bro
everytime i change to other rom,other kernel
the results is...
all core is on
vijayr2002 said:
Hello,
Mi 4i lags/slows down most of the time, when i check CPU-Z during that time, i can see that only the lower clocked 2/4 cpu cores run constantly at 800 Mhz. It is very difficult to use when it is so slow. Other 4/6 cores remain inactive.
Is there any solution for this weird behavior while running in Balanced mode. Even when switching to Performance mode, nothing changes. I believe due to the heat generated, the OS automatically underclocks the CPU. I have already rooted and tried changing the CPU Governor, Clock speed but it resets to default every time. Sometimes i am unable to change that too.
Thank you.
Click to expand...
Click to collapse
strange, i am using miuipro with sensei and havent found any problem.
This happens in the latest stable MIUI7 ROM. I think it is time to change to a custom rom.
i have the 1689mhz bug!!! at random time the MIN freq of the cpu is stuck at 1689mhz andthe max still at 2ghz. ( you can activate on developer options the "show cpu info" toggle)
i cannot change the min value from kernel adiutor, i click on 652mhz but nothing changes, only a REBOOT actually fix the min freq used.
i thought it was a problem of my custom rom resurrection 5.8.3 or the fact i am using kernel adiutor, in fact this app does randomly give CPU LOAD BUG on several devices i mod! sometimes kernel adiutor load my cpu cores at 100% also on light load, but just forceclosing the app the cores return to lower freq.
but the 1689mhz bug is a KERNEL BUG, i read about this bug also on people with stock rom, and the p2a42 phone.... and i have p2c72 hardware phone!!! so this kernel BUG is found in EVERY VERSION of this phone.
please developers, we need a modded kernel that fixes this bug, and why not.......... new i/o schedulers and governors.... and maybe a little undervolt for every cpu freq
realista87 said:
i have the 1689mhz bug!!! at random time the MIN freq of the cpu is stuck at 1689mhz andthe max still at 2ghz. ( you can activate on developer options the "show cpu info" toggle)
i cannot change the min value from kernel adiutor, i click on 652mhz but nothing changes, only a REBOOT actually fix the min freq used.
i thought it was a problem of my custom rom resurrection 5.8.3 or the fact i am using kernel adiutor, in fact this app does randomly give CPU LOAD BUG on several devices i mod! sometimes kernel adiutor load my cpu cores at 100% also on light load, but just forceclosing the app the cores return to lower freq.
but the 1689mhz bug is a KERNEL BUG, i read about this bug also on people with stock rom, and the p2a42 phone.... and i have p2c72 hardware phone!!! so this kernel BUG is found in EVERY VERSION of this phone.
please developers, we need a modded kernel that fixes this bug, and why not.......... new i/o schedulers and governors.... and maybe a little undervolt for every cpu freq
Click to expand...
Click to collapse
Haha! Have very less hopes,bcoz some feel that custom kernels are not at all needed! They think that a device wid 2ghz processor doesn't need custom kernel
And btw the post topic is 100% right,bt the place where it's posted is wrong! This should be under discussion section
realista87 said:
i have the 1689mhz bug!!! at random time the MIN freq of the cpu is stuck at 1689mhz andthe max still at 2ghz. ( you can activate on developer options the "show cpu info" toggle)
i cannot change the min value from kernel adiutor, i click on 652mhz but nothing changes, only a REBOOT actually fix the min freq used.
Click to expand...
Click to collapse
Yes, thats true. The bug is i think VDD related. Sometimes the VDD switches automatically on, the min CPU freq goes up to 1689 MHz, and can not be lowered until you don't switch off the VDD. You can switch off in Kernel Adiutor/Thermal section, or use the following command :
echo '0' > /sys/module/msm_thermal/vdd_restriction/enabled
I use the KSLABS Schedule! app to run the command every 5 minutes.
I hope this will help you, until we get one bugfree kernel.
u are right
now the bug is MORE AGGRESSIVE THAN EVER............ i rebooted, i attachedthe phone to a charger, arrived 100%, then rest for 1h30min on idle(deep sleep) but when i started using the phone... i checked the frequencies and BOOM....... another time the bug of 1689mhz!!! the battery was 100%......
maybe there is an app that causes this... but which one?
realista87 said:
maybe there is an app that causes this... but which one?
Click to expand...
Click to collapse
Which ROM do you use?
I have stock 244, but the method worked for me in 233 too. In the past, I used the Magisk Crossbreeder Lite module to eliminate this problem, but the latest (1.6+) versions made the phone very slow, especially booting.
Vis77 said:
Yes, thats true. The bug is i think VDD related. Sometimes the VDD switches automatically on, the min CPU freq goes up to 1689 MHz, and can not be lowered until you don't switch off the VDD. You can switch off in Kernel Adiutor/Thermal section, or use the following command :
echo '0' > /sys/module/msm_thermal/vdd_restriction/enabled
I use the KSLABS Schedule! app to run the command every 5 minutes.
I hope this will help you, until we get one bugfree kernel.
Click to expand...
Click to collapse
can you help me with the console command... but with macrodroid? i don't use that app
edit_ i setted your app, ibut i prefer every 1h to toggle VDD off
realista87 said:
u are right
now the bug is MORE AGGRESSIVE THAN EVER............ i rebooted, i attachedthe phone to a charger, arrived 100%, then rest for 1h30min on idle(deep sleep) but when i started using the phone... i checked the frequencies and BOOM....... another time the bug of 1689mhz!!! the battery was 100%......
maybe there is an app that causes this... but which one?
Click to expand...
Click to collapse
Maybe the Kernel adiutor itself cause the high load, as background task make 28-30% cpu load, see the attachment.
But, the 1689 MHz bug still exist. :-\
Vis77 said:
Maybe the Kernel adiutor itself cause the high load, as background task make 28-30% cpu load, see the attachment.
But, the 1689 MHz bug still exist. :-\
Click to expand...
Click to collapse
what app do you use to see the % of cpu for each thread?
i don't think that the cause is kernel adiutor... i repeat, a lot of people with 100% stock rom have this bug.....
hey vis could you help me with the string of the scheduler app? i don't understand how to set every 1 hour my previous screenshot i think is wrong because it does not work every 1 h
sorry but the "cron expression" is too much difficult to me to understand.....
EDIT i found how to do every 1h!! 0 0 0/1 1/1 * ? *
thanks to this site!!! http://www.cronmaker.com/
realista87 said:
what app do you use to see the % of cpu for each thread?
i don't think that the cause is kernel adiutor... i repeat, a lot of people with 100% stock rom have this bug.....
[/B]
Click to expand...
Click to collapse
The app name is 3C Toolbox Pro.
Yes the bug is still here, Kernel Adiutor is only different problem.
After reading all your discussion.. I understood that one of you knew solution to stop the bug ,and the other guy learnt how to do it ..
But I don't get a single thing ,what and how you solved that bug
Note : I don't even know that 1698 bug is present , all I know is cpu idle is consuming more power ..
Is this the same thing you guys were discussing?
If yes ..how can a I solve it ? Any walkthrough?for dumb minds like me ...?
nandakis4 said:
After reading all your discussion.. I understood that one of you knew solution to stop the bug ,and the other guy learnt how to do it ..
But I don't get a single thing ,what and how you solved that bug
Note : I don't even know that 1698 bug is present , all I know is cpu idle is consuming more power ..
Is this the same thing you guys were discussing?
If yes ..how can a I solve it ? Any walkthrough?for dumb minds like me ...
Click to expand...
Click to collapse
I've made the following observations:
On a fresh install(stock or custom rom(i have not tried Firelord versions)), rooted phone(with Magisk or SuperSU), if you install the Kernel Adiutor, and go to Thermal section the VDD restriction by default is OFF. You can change freely the CPU minimum frequency.
After some hours/days(total random) something switch ON the VDD restriction, the CPU minimun frequency going up to 1698 MHz, and unable to set back the default 652 MHz. If you switch off the screen the cores going to deep sleep, but if you switch on the screen the min. freq. is still 1698 MHZ.
If you manually switch OFF the VDD restriction, the CPU working normal, until switched ON automatically again.
If your phone is not rooted, the only thing what you can notice that the battery is dropping faster than usual, or the phone a bit warmer.
The problem still occurs even if you do not have a program that you can turn on/off the VDD.
The above solution does not repair the problem, it only remedies the symptoms...
I sometimes notice that even though I don't use it, "Google Play Services" consume an unusual amount of battery and will continue to do so unless I reboot the phone. I have never investigated the cause. Might this be related to the 1698MHz bug ?
medwatt said:
I sometimes notice that even though I don't use it, "Google Play Services" consume an unusual amount of battery and will continue to do so unless I reboot the phone. I have never investigated the cause. Might this be related to the 1698MHz bug ?
Click to expand...
Click to collapse
I do not think so, but check the status of VDD when you have rooted phone. Sometimes I have too huge battery usage caused by the Google Play Services, but i would suspect first of the Location services. If I use some sport tracker, or navigation app then growing for me the Google Play Services consumption.
Vis77 said:
I do not think so, but check the status of VDD when you have rooted phone. Sometimes I have too huge battery usage caused by the Google Play Services, but i would suspect first of the Location services. If I use some sport tracker, or navigation app then growing for me the Google Play Services consumption.
Click to expand...
Click to collapse
My phone is rooted. I will start monitoring VDD. FYI, I don't use any google app (Gmail, Play Store, Maps, etc ...). Location services is also turned off. Sometimes, out of nowhere, I'd see Google Play Services at the top of the battery consumption details. Yesterday, it had a very high CPU consumption time of around 1h (prevented the phone from going to sleep; had 3000+ wakelocks). I had to reboot the phone to get it to stop eating my battery. Usually, Google Play Services use the CPU for a total of 10min on a full charge.
medwatt said:
My phone is rooted. I will start monitoring VDD. FYI, I don't use any google app (Gmail, Play Store, Maps, etc ...). Location services is also turned off. Sometimes, out of nowhere, I'd see Google Play Services at the top of the battery consumption details. Yesterday, it had a very high CPU consumption time of around 1h (prevented the phone from going to sleep; had 3000+ wakelocks). I had to reboot the phone to get it to stop eating my battery. Usually, Google Play Services use the CPU for a total of 10min on a full charge.
Click to expand...
Click to collapse
If you don't use it, you can remove what is mentioned on the MicroG Prerequisites page[0].
Some apps nag about it but the only noticable problem I have is messenger lite notifications don't go automaticaly away after replying. Even my banking app keeps working.
[0]https://github.com/microg/android_packages_apps_GmsCore/wiki/Prerequisites
In the options to save battery life there is an option to turn on a cup limiter. Is there a way to automate this? Limiting the cpu when not in use automatically would be helpful. Or does this phone implement this already? Does a program already exist to do this? Any knowledge on this topic would be helpful.
Dreadsta5889 said:
In the options to save battery life there is an option to turn on a cup limiter. Is there a way to automate this? Limiting the cpu when not in use automatically would be helpful. Or does this phone implement this already? Does a program already exist to do this? Any knowledge on this topic would be helpful.
Click to expand...
Click to collapse
As far as I know, 8 core exynos cpus use 4 power efficient cores. so in some way they apply limiters.
I think every Android lowers the CPU frequency when not used....
Yes, but when you go to battery, and max power settings, the one thing on the list that affects the time the most is the speed limiter, which shows to add like 1200 minutes every time. I'd like to just use that alone on occasion, and not be limited to 8 apps.
Why do not you try using Tasker for this?
that wont really affect anything, the CPU will automatically idle when its not performing a task or if the screen off.
Dreadsta5889 said:
In the options to save battery life there is an option to turn on a cup limiter. Is there a way to automate this? Limiting the cpu when not in use automatically would be helpful. Or does this phone implement this already? Does a program already exist to do this? Any knowledge on this topic would be helpful.
Click to expand...
Click to collapse
I use different kernel apps 3 c toolbox or kernel auditor and limmitnmine on the snap dragon model I cap my big cores normally to 1.9 and small cores to 1.4 or so. I would love to shut a few off but Samsung uses there own hotplug and most kernel apps can't do nothing with that
Maybe you could check this app
https://forum.xda-developers.com/android/apps-games/app-helix-engine-v1-0-beta-3-t3745746