Change the cpu frequency

Ayam · ‎05-12-2014

Hello

First of all, Sorry if I am posting my thread on the wrong platform.

I want to change the cpu frequency. I have install cpufrequtils. the command "cpufreq-info" give me information

cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@vger.kernel.org, please. analyzing CPU 0: driver: intel_pstate CPUs which run at the same hardware frequency: 0 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: 0.97 ms. hardware limits: 1.20 GHz - 2.40 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 1.20 GHz and 2.40 GHz. The governor "performance" may decide which speed to use within this range.

when I try to run the command: "sudo cpufreq-set -f 1500000". I am getting error: Error setting new values. Common errors: - Do you have proper administration rights? (super-user?) - Is the governor you requested available and modprobed? - Trying to set an invalid policy? - Trying to set a specific frequency, but userspace governor is not available, for example because of hardware which cannot be set to a specific frequency or because the userspace governor isn't loaded?

Can you give any idea how to approach this problem?

Regards

SB17 · ‎05-12-2014

in my opinion additional kernel modules for policy is not necessary. Perhaps in the BIOS selected consumption scheme blocking this policy/

It may be depend of BIOS settings. Try change in BIOS item like "cpu config" scheme. May be selected "max perfomance" ?

You can look in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor what policies are available (modprobe acpi_cpufreq).

Ayam · ‎05-13-2014

I have governor: performance and powersave with the driver intel_pstate.

If I do not want to change the BIOS settings then do I have to install acpi_cpufreq?

Thanks,

SB17 · ‎05-13-2014

acpi_cpufreq for provide governor and frequency list in sysfs (for example /devices/system/cpu/cpu*/cpufreq/ )

SB17 · ‎05-13-2014

Look to https://wiki.archlinux.org/index.php/CPU_frequency_scaling and http://www.tweaktown.com/reviews/6101/supermicro-x9dr7-tf-intel-c602j-server-motherboard-review/index4.html ("The advanced CPU tab shows the CPU configuration for this board").

In my opinion you need to see the BIOS settings