[solved] What is constantly changing my CPU frequency?

orschiro · 2013-06-13 19:38:35

Hi there,

I set /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor to userspace but still something is changing my frequency automatically:

[root@thinkpad orschiro]# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 
1866000
[root@thinkpad orschiro]# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq 
800000

Suddenly the frequency changes from 1866000 to 800000. Why is it not enough to set the govenor to userspace and what is causing the frequency to change?

I am running a Thinkpad X200T with Gnome 3.8.

Thanks!

Last edited by orschiro (2013-06-16 09:26:06)

orschiro · 2013-06-14 07:39:37

As referenced in the wiki I tried disabling the new pstate driver by appending "intel_pstate=disable" to the kernel line. But still something is changing my frequency...

theapodan · 2013-06-14 20:40:03

I don't think that the governor for cpu1 has an effect on cpu0:

..I set /sys/devices/system/cpu/cpu1/c
...[root@thinkpad orschiro]# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq

And if you don't want the freq to change, use the performance governor.

orschiro · 2013-06-16 09:25:53

Hi theapodan,

Sorry I forgot to mention that I also changed the governor for cpu0 to userspace. But thanks for your tip. I did not know that only performance will not change the frequency.

stqn · 2013-06-17 11:46:25

If you check the documentation for the CPUfreq governors you’ll see that performance is not the only governor that will not change the frequency.

Edit: also, have you checked https://wiki.archlinux.org/index.php/CP … limitation and http://www.thinkwiki.org/wiki/Problem_w … cy_scaling ?

Last edited by stqn (2013-06-17 12:07:35)

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#1 2013-06-13 19:38:35

[solved] What is constantly changing my CPU frequency?

#2 2013-06-14 07:39:37

Re: [solved] What is constantly changing my CPU frequency?

#3 2013-06-14 20:40:03

Re: [solved] What is constantly changing my CPU frequency?

#4 2013-06-16 09:25:53

Re: [solved] What is constantly changing my CPU frequency?

#5 2013-06-17 11:46:25

Re: [solved] What is constantly changing my CPU frequency?

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