[Bug 217931] amd-pstate lacks crucial features: CPU frequency and boost control

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217931

--- Comment #5 from Artem S. Tashkinov (aros@gmx.com) ---
(In reply to Perry Yuan(AMD) from comment #4)
> (In reply to Artem S. Tashkinov from comment #0)
> > Created attachment 305131 [details]
> > Power Options: Processor Power Management in Windows
> > 
> > It would be really great if amd-pstate had a feature parity with
> > acpi-cpufreq, namely
> > 
> > 1) Being able to set operating frequencies (maximum, minimum and
> > user-defined)
> > 
> > 2) Being able to enable/disable boost
> > 
> > Currently both features are not available and frequency control is simply
> > ignored (bug 215800).
> > 
> > Rationale:
> > 
> > 1) This is required for benchmarking and proper temperature control. Boost
> > frequencies are subject to multiple limitations (power in watts, amperage,
> > voltage, temperature, BIOS limitations) and can change depending on the
> > workload. Setting a low enough frequency allows to run benchmarks in the
> > controlled environment and get proper data.
> > 
> > Windows allows to do that easily, see the attached screenshot.
> > 
> > 2) Disabling boost is an easy option to subdue operating temperatures
> though
> > if the previous issue is tackled, it's not really needed.
> 
> Thanks for the suggestion.
> There are two modes for amd pstate driver, one passive, and another active
> mode,  the passive mode already has the boost control feature.
> 
> # cat /sys/devices/system/cpu/cpufreq/boost
> 1
> 
> I have raised this requestion and will get active mode supported with a new
> patch.
> 

Thank you for chiming in, Perry!

I'm looking forward to being able to control min/max frequency which kinda
negates the need for boost control. I know this can be done since the Windows
CPPC driver allows that perfectly.

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