linux-kernel - Re: [PATCH 4/4 v2] sched/fair: reduce busy load balance interval

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Message-ID: <jhja6xgmu37.mognet@arm.com>
Date:   Wed, 23 Sep 2020 15:43:56 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, linux-kernel@...r.kernel.org, pauld@...hat.com,
        hdanton@...a.com
Subject: Re: [PATCH 4/4 v2] sched/fair: reduce busy load balance interval


On 21/09/20 08:24, Vincent Guittot wrote:
> The busy_factor, which increases load balance interval when a cpu is busy,
> is set to 32 by default. This value generates some huge LB interval on
> large system like the THX2 made of 2 node x 28 cores x 4 threads.
> For such system, the interval increases from 112ms to 3584ms at MC level.
> And from 228ms to 7168ms at NUMA level.
>
> Even on smaller system, a lower busy factor has shown improvement on the
> fair distribution of the running time so let reduce it for all.
>
> Reviewed-by: Phil Auld <pauld@...hat.com>
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>

Reviewed-by: Valentin Schneider <valentin.schneider@....com>