linux-kernel - Re: [PATCH v4] sched/fair: Introduce SIS_UTIL to search idle CPU based on sum of util

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Message-ID: <4027cf04-d39e-d8fd-b3af-c1873757bb39@amd.com>
Date:   Fri, 24 Jun 2022 09:34:49 +0530
From:   K Prateek Nayak <kprateek.nayak@....com>
To:     Chen Yu <yu.c.chen@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Barry Song <21cnbao@...il.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Len Brown <len.brown@...el.com>,
        Ben Segall <bsegall@...gle.com>,
        Aubrey Li <aubrey.li@...el.com>,
        Abel Wu <wuyun.abel@...edance.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Tim Chen <tim.c.chen@...el.com>, linux-kernel@...r.kernel.org,
        Yicong Yang <yangyicong@...ilicon.com>,
        Mohini Narkhede <mohini.narkhede@...el.com>
Subject: Re: [PATCH v4] sched/fair: Introduce SIS_UTIL to search idle CPU
 based on sum of util_avg

Hello Chenyu,

On 6/24/2022 7:37 AM, Chen Yu wrote:

>
> [..snip..]>
>> With v4 on the current tip, I don't see any need for
>> a special case for systems with smaller LLCs with
>> SIS_PROP disabled and SIS_UITL enable. Even SIS Efficiency
>> seems to be better with SIS_UTIL for hackbench.
>>
>> Tested-by: K Prateek Nayak <kprateek.nayak@....com>
> Thanks again. Would you mind if I add this test report link into next patch
> version?

Sure.
I'm assuming the next version will disables SIS_PROP and only
keep SIS_UTIL enabled which is the same configuration we ran
during this round of testing. The results should stay the same :)
--
Thanks and Regards,
Prateek