From: Valentin Schneider <valentin.schneider@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
dietmar.eggemann@arm.com, rostedt@goodmis.org,
bsegall@google.com, mgorman@suse.de,
linux-kernel@vger.kernel.org, pauld@redhat.com, hdanton@sina.com
Subject: Re: [PATCH 4/4 v2] sched/fair: reduce busy load balance interval
Date: Wed, 23 Sep 2020 15:43:56 +0100 [thread overview]
Message-ID: <jhja6xgmu37.mognet@arm.com> (raw)
In-Reply-To: <20200921072424.14813-5-vincent.guittot@linaro.org>
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@redhat.com>
> Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
next prev parent reply other threads:[~2020-09-23 14:44 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-21 7:24 [PATCH 0/4 v2] sched/fair: Improve fairness between cfs tasks Vincent Guittot
2020-09-21 7:24 ` [PATCH 1/4 v2] sched/fair: relax constraint on task's load during load balance Vincent Guittot
2020-09-23 14:43 ` Valentin Schneider
2020-09-29 7:56 ` [tip: sched/core] sched/fair: Relax " tip-bot2 for Vincent Guittot
2020-09-21 7:24 ` [PATCH 2/4 v2] sched/fair: reduce minimal imbalance threshold Vincent Guittot
2020-09-23 14:43 ` Valentin Schneider
2020-09-29 7:56 ` [tip: sched/core] sched/fair: Reduce " tip-bot2 for Vincent Guittot
2020-09-21 7:24 ` [PATCH 3/4 v2] sched/fair: minimize concurrent LBs between domain level Vincent Guittot
2020-09-23 14:43 ` Valentin Schneider
2020-09-29 7:56 ` [tip: sched/core] sched/fair: Minimize " tip-bot2 for Vincent Guittot
2020-09-21 7:24 ` [PATCH 4/4 v2] sched/fair: reduce busy load balance interval Vincent Guittot
2020-09-23 14:43 ` Valentin Schneider [this message]
2020-09-29 7:56 ` [tip: sched/core] sched/fair: Reduce " tip-bot2 for Vincent Guittot
2020-09-23 15:47 ` [PATCH 0/4 v2] sched/fair: Improve fairness between cfs tasks Mel Gorman
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