linux-kernel - Re: [PATCH v6 0/4] sched/fair: Improve scan efficiency of SIS

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Message-ID: <757f143b-0c5d-4dd9-f7a1-5450da3b86b5@bytedance.com>
Date:   Thu, 16 Feb 2023 21:18:08 +0800
From:   Abel Wu <wuyun.abel@...edance.com>
To:     K Prateek Nayak <kprateek.nayak@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Mel Gorman <mgorman@...e.de>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Valentin Schneider <valentin.schneider@....com>
Cc:     Josh Don <joshdon@...gle.com>, Chen Yu <yu.c.chen@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "Gautham R . Shenoy" <gautham.shenoy@....com>,
        Aubrey Li <aubrey.li@...el.com>,
        Qais Yousef <qais.yousef@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Yicong Yang <yangyicong@...wei.com>,
        Barry Song <21cnbao@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/4] sched/fair: Improve scan efficiency of SIS

Hi Prateek, thanks very much for your solid testings!

On 2/7/23 11:42 AM, K Prateek Nayak wrote:
> Hello Abel,
> 
> I've retested the patches with on the updated tip and the results
> are still promising.
> 
> tl;dr
> 
> o Hackbench sees improvements when the machine is overloaded.
> o tbench shows improvements when the machine is overloaded.
> o The unixbench regression seen previously seems to be unrelated
>    to the patch as the spawn test scores are vastly different
>    after a reboot/kexec for the same kernel.
> o Other benchmarks show slight improvements or are comparable to
>    the numbers on tip.

Cheers! Yet I still see some minor regressions in the report
below. As we discussed last time, reducing unnecessary updates
on the idle cpumask when LLC is overloaded should help.

Thanks & Best regards,
	Abel