Re: default cpufreq gov, was: [PATCH] sched/fair: check for idle core

Vincent Guittot
2020-10-22T15:55:44Z

On Thu, 22 Oct 2020 at 17:45, A L <mail@lechevalier.se> wrote:
>
>
>
> ---- From: Peter Zijlstra <peterz@infradead.org> -- Sent: 2020-10-22 - 14:29 ----
>
> > On Thu, Oct 22, 2020 at 02:19:29PM +0200, Rafael J. Wysocki wrote:
> >> > However I do want to retire ondemand, conservative and also very much
> >> > intel_pstate/active mode.
> >>
> >> I agree in general, but IMO it would not be prudent to do that without making
> >> schedutil provide the same level of performance in all of the relevant use
> >> cases.
> >
> > Agreed; I though to have understood we were there already.
>
> Hi,
>
>
> Currently schedutil does not populate all stats like ondemand does, which can be a problem for some monitoring software.
>
> On my AMD 3000G CPU with kernel-5.9.1:
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>
> grep. /sys/devices/system/cpu/cpufreq/policy0/stats/*
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> With ondemand:
> time_in_state:3900000 145179
> time_in_state:1600000 9588482
> total_trans:177565
> trans_table: From : To
> trans_table: : 3900000 1600000
> trans_table: 3900000: 0 88783
> trans_table: 1600000: 88782 0
>
> With schedutil only two file exists:
> reset:<empty>
> total_trans:216609
>
>
> I'd really like to have these stats populated with schedutil, if that's possible.

Your problem might have been fixed with
commit 96f60cddf7a1 ("cpufreq: stats: Enable stats for fast-switch as well")

>
> Thanks.
>