[Bug 215800] amd-pstate does not allow to set arbitrary maximum CPU frequency above 2200MHz for a desktop Zen 3 CPU

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215800

--- Comment #30 from Mario Limonciello (AMD) (mario.limonciello@amd.com) ---
> It's a little bit confusing though, as in Windows I can perfectly set minimum
> and maximum CPU frequencies and I totally expected this driver to actually
> allow that.

I suppose I'm confused as well.  Windows should be using EPP as well, and
various software constructs like the power slider will be changing that bias.

Maybe you can better explain exactly what you do in Windows and exactly what is
happening.

> Lastly the documentation mentions: energy_performance_available_preferences,
> the file that I don't have.

Eh?  Didn't your above comment show this:

/sys/devices/system/cpu/cpufreq/policy0 $ grep -r . 
energy_performance_available_preferences:default performance
balance_performance balance_power power 

> Lastly there's no boost configuration support which is available both for
> acpi-cpufreq and Intel's native CPPC driver.

Something seems quite wrong if you're not getting boost support.
It registers for boost, see
https://github.com/torvalds/linux/blob/v6.4/drivers/cpufreq/amd-pstate.c#L1121

> It's worse than acpi-cpufreq from seemingly any PoV. Maybe there are some
> advantages for APUs but on my desktop I only see major disadvantages

I /suspect/ what you'll want to do is change the scaling_governor from
'powersave' to 'performance' for your desktop use case.

-- 
You may reply to this email to add a comment.

You are receiving this mail because:
You are the assignee for the bug.