linux-kernel - Re: [PATCH] sched/fair: Optimize select_idle

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Message-Id: <20191206133930.GA25024@linux.vnet.ibm.com>
Date:   Fri, 6 Dec 2019 19:09:30 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Valentin Schneider <valentin.schneider@....com>
Subject: Re: [PATCH] sched/fair: Optimize select_idle_core

Hi Vincent,

> >
> > Collecting ticks on a Power 9 SMT 8 system around select_idle_core
> > while running schbench shows us that
> >
> > (units are in ticks, hence lesser is better)
> > Without patch
> >     N           Min           Max        Median           Avg        Stddev
> > x 130           151          1083           284     322.72308     144.41494
> >
> >
> > With patch
> >     N           Min           Max        Median           Avg        Stddev   Improvement
> > x 164            88           610           201     225.79268     106.78943        30.03%
> 
> Thanks for the figures. Might be good to include them in the commit message
> 

Since I needed a debug/hack patch on top of upstream/my-patch to get these
numbers, I wasn't sure if this would be ideal to be included in a commit
message. But if you still think it's good to have, I can re-spin the patch
with these numbers included.

> Reviewed-by: Vincent Guittot <vincent.guittot@...aro.org>
>

Thanks.

-- 
Thanks and Regards
Srikar Dronamraju