linux-kernel - Re: [PATCH v4 1/6] x86,sched: Add support for frequency invariance

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Message-ID: <20191223144043.ticfxfgbolsqk74i@e107158-lin.cambridge.arm.com>
Date:   Mon, 23 Dec 2019 14:40:44 +0000
From:   Qais Yousef <qais.yousef@....com>
To:     Doug Smythies <dsmythies@...us.net>
Cc:     'Giovanni Gherdovich' <ggherdovich@...e.cz>, x86@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        'Mel Gorman' <mgorman@...hsingularity.net>,
        'Matt Fleming' <matt@...eblueprint.co.uk>,
        'Viresh Kumar' <viresh.kumar@...aro.org>,
        'Juri Lelli' <juri.lelli@...hat.com>,
        'Paul Turner' <pjt@...gle.com>,
        'Peter Zijlstra' <peterz@...radead.org>,
        'Vincent Guittot' <vincent.guittot@...aro.org>,
        'Quentin Perret' <qperret@...rret.net>,
        'Dietmar Eggemann' <dietmar.eggemann@....com>,
        'Srinivas Pandruvada' <srinivas.pandruvada@...ux.intel.com>,
        'Thomas Gleixner' <tglx@...utronix.de>,
        'Ingo Molnar' <mingo@...hat.com>,
        'Borislav Petkov' <bp@...e.de>, 'Len Brown' <lenb@...nel.org>,
        "'Rafael J . Wysocki'" <rjw@...ysocki.net>
Subject: Re: [PATCH v4 1/6] x86,sched: Add support for frequency invariance

On 12/23/19 14:07, Qais Yousef wrote:
> > Re-boot to the nocgv1 (stock + cgroup_no_v1=all) kernel.
> > set the schedutil governor.
> > launch test 2 and related monitoring tools.
> > verify performance governor like behavior.
> 
> So as stated above, by default uclamp_{min, max} = (0, 1024). So it wouldn't
> act as performance governor by default unless you explicitly write 1024 to
> uclamp.min.
> 
> Let me go find Ubuntu mainline tree to see if they applied anything extra in
> there. If they modified the default behavior that could explain what you see.

Actually I see what you were saying now that you copy the config. So I think
I misunderstood and you are running Linus' 5.5-rc2 + Ubuntu PPA config.

I'm trying to to reproduce the issue at my end.

Cheers

--
Qais Yousef