[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

Perry Yuan(AMD) (Perry.Yuan@amd.com) changed:

           What    |Removed                     |Added
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                 CC|                            |Perry.Yuan@amd.com

--- Comment #4 from Perry Yuan(AMD) (Perry.Yuan@amd.com) ---
(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.

Perry.

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