[Bug 215729] amd-pstate driver has a much higher idle power consumption for a desktop Zen 3 CPU

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215729

--- Comment #6 from Artem S. Tashkinov (aros@gmx.com) ---
After rebooting again with amd-pstate the situation has kinda improved:

Max CPU frequency in idle is now around 1.2GHz with occasional spikes to
2.2GHz.

Power consumption is now around 23W - not a big difference with acpi-cpufreq
but I was under the impression that amd-pstate should be more power efficient,
not less.

'Minimum' governor is now at around ~20W in idle which matches acpi-cpufreq.

----

Here's the most important thing:

The ondemand governor in idle makes the CPU consume around 23.5W

The performance governor in idle makes the CPU consume around 20.5W which is
near perfect.

So, it looks like the ondemand governor falters with amd-pstate for some
reasons. Maybe it does more work than necessary, maybe it gets called far too
often, I've no idea.

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