linux-kernel - Re: [PATCH 00/24] Complete EEVDF

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Message-ID: <CAKfTPtAjXejbsGS+Wd0maiiUyCgSb2xPVZGUXUPCSw_kNLJRDA@mail.gmail.com>
Date: Wed, 14 Aug 2024 18:59:57 +0200
From: Vincent Guittot <vincent.guittot@...aro.org>
To: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com, juri.lelli@...hat.com, 
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, 
	mgorman@...e.de, vschneid@...hat.com, linux-kernel@...r.kernel.org, 
	kprateek.nayak@....com, wuyun.abel@...edance.com, youssefesmat@...omium.org, 
	tglx@...utronix.de
Subject: Re: [PATCH 00/24] Complete EEVDF

On Wed, 14 Aug 2024 at 18:46, Mike Galbraith <efault@....de> wrote:
>
> On Wed, 2024-08-14 at 16:34 +0200, Vincent Guittot wrote:
> >
> > While trying to test what would be the impact of delayed dequeue on
> > load_avg, I noticed something strange with the running slice. I have a
> > simple test with 2 always running threads on 1 CPU and the each thread
> > runs around 100ms continuously before switching to the other one
> > whereas I was expecting 3ms (the sysctl_sched_base_slice on my system)
> > between 2 context swicthes
> >
> > I'm using your sched/core branch. Is it the correct one ?
>
> Hm, building that branch, I see the expected tick granularity (4ms).

On my side tip/sched/core switches every 4ms but Peter's sched/core,
which is delayed queued on top of tip/sched/core if I don't get it
wrong, switches every 100ms.

>
>         -Mike
>