LinuxQuestions.org - CPU frequency governor configuration

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CPU frequency governor configuration

Hi,
I would like to change the governor to "performance", but I don't even have the directory "cpufreq" under /sys/devices/system/cpu/cpuX/.

The only reason that made me believe that I work with "ondemand" governor is the fact that my kernel (4.1.6-200.fc22.x86_64) is configured with the below flag:
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y

Is there a way to change the governor type without recompiling the kernel?

Any suggestions will be highly appreciated.

Thanks
Yan

I already read this page, but unfortunately there is no explanation regarding what should be done if the cpufreq dir is missing.

You have to install cpufreq utils.

What distro are you using?

I am using Fedora 22. Actually I already installed the cpu freq utills but the directory still didn't show up.

Quote:

Originally Posted by Keruskerfuerst (Post 5444099)

You have to install cpufreq utils.

What distro are you using?

hi,
could you please comment on my answer.
Thanks

Have you looked at this?

Sure, it simply doesnt work. It prints CPU0 with empty info and thats all.

Interesting. I'm running Rawhide (kernel 4.3.0-1.fc24.x86_64), and I get

Code:

~$ cpupower frequency-info --governors

analyzing CPU 0:

conservative userspace powersave ondemand performance

~$ cpupower frequency-set --governor ondemand

Subcommand frequency-set needs root privileges

~$ sudo cpupower frequency-set --governor ondemand

Setting cpu: 0

Setting cpu: 1

~$

However, I don't know if anything actually changed. I also get

Code:

~$ sudo cpupower info

System does not support Intel's performance bias setting

analyzing CPU 0:

~$

CPU is an AMD Athlon X2 5400+

So, perhaps its a Linux bug and looks like not in a single distro.

Post more info about your system. Do you have any of the x86 CPU frequency scaling drivers in the kernel ?

I wrote a small howto here:
http://docs.slackware.com/howtos:har...quency_scaling

The directory won't show up unless you have the drivers that support your system.

Hi here is some more info. First, below I paste the kernel flags related to FREQ configuration.
Next, I show the related modules I have. BTW, when I tried loading any of the modules (using modprobe) I didn't get any errors but ! I didnt get any change either.

I really want to work with a standard kernel without any additional compilations etc...

Thanks in advance..

[root@magma14 ~]# cat /boot/config-4.1.6-200.fc22.x86_64 | grep FREQ
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_GOV_COMMON=y
CONFIG_CPU_FREQ_STAT=m
CONFIG_CPU_FREQ_STAT_DETAILS=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
CONFIG_X86_PCC_CPUFREQ=m
CONFIG_X86_ACPI_CPUFREQ=m
CONFIG_X86_ACPI_CPUFREQ_CPB=y
CONFIG_X86_AMD_FREQ_SENSITIVITY=m
CONFIG_PM_DEVFREQ=y
# DEVFREQ Governors
CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND=m
# CONFIG_DEVFREQ_GOV_PERFORMANCE is not set
# CONFIG_DEVFREQ_GOV_POWERSAVE is not set
# CONFIG_DEVFREQ_GOV_USERSPACE is not set
# DEVFREQ Drivers
# CONFIG_PM_DEVFREQ_EVENT is not set

[root@magma14 ~]# /sbin/modinfo /lib/modules/$(uname -r)/kernel/drivers/cpufreq/* | grep "^[fd]"
filename: /lib/modules/4.1.6-200.fc22.x86_64/kernel/drivers/cpufreq/acpi-cpufreq.ko.xz
description: ACPI Processor P-States Driver
depends:
filename: /lib/modules/4.1.6-200.fc22.x86_64/kernel/drivers/cpufreq/amd_freq_sensitivity.ko.xz
description: AMD frequency sensitivity feedback powersave bias for the ondemand governor.
depends:
filename: /lib/modules/4.1.6-200.fc22.x86_64/kernel/drivers/cpufreq/cpufreq_stats.ko.xz
description: Export cpufreq stats via sysfs
depends:
filename: /lib/modules/4.1.6-200.fc22.x86_64/kernel/drivers/cpufreq/p4-clockmod.ko.xz
description: cpufreq driver for Pentium(TM) 4/Xeon(TM)
depends: speedstep-lib
filename: /lib/modules/4.1.6-200.fc22.x86_64/kernel/drivers/cpufreq/pcc-cpufreq.ko.xz
description: Processor Clocking Control interface driver
depends:
filename: /lib/modules/4.1.6-200.fc22.x86_64/kernel/drivers/cpufreq/powernow-k8.ko.xz
description: AMD Athlon 64 and Opteron processor frequency driver.
depends:
filename: /lib/modules/4.1.6-200.fc22.x86_64/kernel/drivers/cpufreq/speedstep-lib.ko.xz
description: Library for Intel SpeedStep 1 or 2 cpufreq drivers.
depends:

What about the 'X86_INTEL_PSTATE' driver ?

Also, what processor do you have Intel/AMD make, model ?

Also, check your UEFI/BIOS settings and make sure cpu frequency scaling is enabled.