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Tags: 18.04   xubuntu   cpu   32-bit   cpufreq  
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Title: How to delete CPU-stats from cpufreq?
ID: /2019/04/27/How-to-delete-CPU-stats-from-cpufreq_
Created: April 27, 2019    Edited:  June 12, 2020
Upload: November 24, 2022    Layout:  post
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From: CPU frequency and voltage scaling statistics in the Linux(TM) kernel

<mysystem>:/sys/devices/system/cpu/cpu0/cpufreq/stats # ls -l
total 0
drwxr-xr-x  2 root root    0 May 14 16:06 .
drwxr-xr-x  3 root root    0 May 14 15:58 ..
--w-------  1 root root 4096 May 14 16:06 reset
-r--r--r--  1 root root 4096 May 14 16:06 time_in_state
-r--r--r--  1 root root 4096 May 14 16:06 total_trans
-r--r--r--  1 root root 4096 May 14 16:06 trans_table


Write-only attribute that can be used to reset the stat counters. This can be useful for evaluating system behaviour under different governors without the need for a reboot.

This should reset all the stats:

echo '1' | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/stats/reset
## ```

From: [How to use cpufrequtils][2]

### cpufreq-set

Allows setting

-d minimum frequency, -u maximum frequency, -f specific frequency (userspace governor must be set first) and -g governor on a -c specific CPU.

`cpufreq-set` needs root privileges in order to work. 

Look for this in your setup:

sudo cpufreq-set -u 950MGhz

and remove it. Or add this to your setup:

sudo cpufreq-set -u 1.20Ghz


From: [HowTo CpuFrequencyScaling][3] 

GOVERNOR variable from /etc/default/cpufrequtils not taking effect

So, you configured the GOVERNOR variable in /etc/default/cpufrequtils and after reboot you notice by running cpufreq-info that the active governor is still "ondemand".

This may happen if you have laptop-mode-tools installed. laptop-mode configures the active governor via the following variables: BATT_CPU_GOVERNOR, LM_AC_CPU_GOVERNOR, NOLM_AC_CPU_GOVERNOR. You can override them to your liking in /etc/laptop-mode/laptop-mode.conf:



From: [Arch Linux CPU frequency scaling][4]

### Setting maximum and minimum frequencies

In rare cases, it may be necessary to manually set maximum and minimum frequencies.

To set the maximum clock frequency (clock_freq is a clock frequency with units: GHz, MHz):

sudo cpupower frequency-set -u clock_freq

To set the minimum clock frequency:

sudo cpupower frequency-set -d clock_freq

To set the CPU to run at a specified frequency:

sudo cpupower frequency-set -f clock_freq ```

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