[systemd-devel] Disabling cpufreq/boost at boot time sometimes fails

[Leon Fauster]

Am 12.07.22 um 18:55 schrieb Thomas HUMMEL:
> Hello,
> 
> I'm using systemd-239-45 on RHEL 8.4 x86_64 AMD nodes on which I disable 
> Turbo Core/Turbo Boost by writing '0' into the following file:
> 
> /sys/devices/system/cpu/cpufreq/boost
> 

What about /sys/devices/system/cpu/intel_pstate/no_turbo  ?

And check your actual config profile. Some  "major" settings must be set 
adequately to allow having a specific config.

  cat /sys/devices/system/cpu/cpufreq/*/energy_performance_preference
  cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_governor

https://www.kernel.org/doc/html/v4.13/admin-guide/pm/intel_pstate.html



> 2) adding an entry for systemd-tmpfiles-setup.service like this:
> 
> w /sys/devices/system/cpu/cpufreq/boost - - - - 0


Using the same approach with success here for the scaling_governor.



> 
> a) SELinux is disabled
> 

Sorry that I have to say, in 2022 disabling SELinux is like
having Win95 installed ... and more important, in the future
you will not be able to disable it. So, better get in touch with it.

--
L