[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 #29 from Artem S. Tashkinov (aros@gmx.com) ---
(In reply to Mario Limonciello (AMD) from comment #28)
> When you're using active mode (EPP), the hardware is choosing frequencies
> and software only provides a hint to set bias.
> 
> You can read a little bit more about active mode at
> https://www.kernel.org/doc/html/latest/admin-guide/pm/amd-pstate.html
> 
> What you should be doing isn't trying to set specific frequency targets, but
> rather you should change the values of 'energy_performance_preference' to
> meet the needs for your workload.

Thanks Mario.

Would be great if the documentation was updated in this case and the variable
removed altogether if the amd-pstate driver is active. I know it's possible.

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.

Now you're saying I need to work with "energy_performance_preference" which
doesn't even look like something I can properly configure.

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

In short it looks like everything is in a deep state of flux.

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

I'll retest the drive in a year. I don't like anything about how it works,
functions and its configuration options. 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.

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