Re: linux-6.6.y: Regression in amd-pstate cpufreq driver since 6.6.34

[Lars Wendler <wendler.lars@web.de>]

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Hello Mario,

Am Mon, 1 Jul 2024 10:58:17 -0500
schrieb Mario Limonciello <mario.limonciello@amd.com>:

> > I've tested both, 6.9.7 and 6.10-rc6 and they both don't have that
> > issue. I can disable CPU boost with both kernel versions.
> 
> Thanks for checking those.  That's good to hear it's only an issue in 
> the LTS series.
> 
> It means we have the option to either drop that patch from LTS kernel 
> series or identify the other commit(s) that helped it.
> 
> Can you see if adding this commit to 6.6.y helps you?
> 
> https://git.kernel.org/superm1/c/8164f743326404fbe00a721a12efd86b2a8d74d2

that commit does not fix the regression.

> > 
> >> I'd like to understand if we just have a missing commit to backport
> >> or it's a problem in the mainline kernel as well.
> >>
> >>   From the below description it's specifically with boost in
> >> passive mode, right?
> > 
> > I have only tested the passive mode on all my Ryzen systems and
> > only my Zen4 machine shows this regression.
> >   
> 
> That's an interesting finding.  Do you know if your other system(s) 
> support preferred cores?
> 
> Also as a curiosity why don't you use active mode (EPP)?  Most people 
> find a better balance with perf/efficiency with EPP.
> 


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