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

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Message-ID: <000301d5b9ae$cd8f5b30$68ae1190$@net>
Date:   Mon, 23 Dec 2019 08:34:04 -0800
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'Qais Yousef'" <qais.yousef@....com>
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 2019.12.23 06:41 Qais Yousef wrote:
> 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.

Yes, exactly.
I have a clone of the main Linus git branch, but steal the kernel
configuration from the Ubuntu mainline PPA.

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

... Doug