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acpi-cpufreq vs amd-pstate
Posted: Tue Apr 05, 2022 8:03 pm
by Grey
So, I compiled kernel 5.17.1 with amd-pstate support. I found the CPPC setting in the BIOS.
Here I realized that the module is disabled by default. However, I really wanted to try 
But it didn't work out. I tried to give priority to one module over another, then I tried to add amd_pstate.enable=1 amd_pstate.shared_mem=1 parameters to Grub.
It didn't work. It gives out as before:
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root# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
acpi-cpufreq
If someone succeeds, please tell me how
Re: acpi-cpufreq vs amd-pstate
Posted: Wed Apr 06, 2022 3:00 pm
by Phoenix
You do have AMD CPU right? As well it looks for this _CPC entry, so if it doesn't exist it will fallback to the one you did not want. It may also be that acpi-cpufreq starts up faster than amd-pstate meaning you need to add this:
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initcall_blacklist=acpi_cpufreq_init
Re: acpi-cpufreq vs amd-pstate
Posted: Fri Apr 15, 2022 2:29 am
by Grey
I read the article and looked at the tests from Michael.
In principle, everything is as I expected. At the moment, amd_pstate is no better than its "acpi colleague".
Who is interested, you can immediately watch the last sentence on the sixth page of the article