linux-kernel - Re: [PATCH 10/10] sched/fair: Implement an EEVDF like policy

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Date:   Sat, 11 Mar 2023 06:53:30 +0100
From:   Mike Galbraith <efault@....de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, vincent.guittot@...aro.org,
        linux-kernel@...r.kernel.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, corbet@....net,
        qyousef@...alina.io, chris.hyser@...cle.com,
        patrick.bellasi@...bug.net, pjt@...gle.com, pavel@....cz,
        qperret@...gle.com, tim.c.chen@...ux.intel.com, joshdon@...gle.com,
        timj@....org, kprateek.nayak@....com, yu.c.chen@...el.com,
        youssefesmat@...omium.org, joel@...lfernandes.org
Subject: Re: [PATCH 10/10] sched/fair: Implement an EEVDF like policy

On Fri, 2023-03-10 at 21:38 +0100, Peter Zijlstra wrote:
> On Thu, Mar 09, 2023 at 05:23:33AM +0100, Mike Galbraith wrote:
> > Ok, seems there must be a math booboo lurking.
>
> Yep that.. please try the version I pushed out here:
>
>   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=sched/eevdf
>
> (It's based on 6.3-rc1, but it should be trivial to rebase onto v6.2 if
> you so wish.)

I stuffed it into .today.  Yup, extreme sleeper stinginess is gone.

tbench/netperf numbers look roughly as previously.  massive_intr vs
desktop CPU distribution improved as expected, but (to me) oddly, the
amount of desktop beating up itself did not.

These are all .today

perf.data.eevdf
  Task                  |   Runtime ms  | Switches | Avg delay ms    | Max delay ms    | Sum delay ms     | Max delay start           | Max delay end          |
  massive_intr:(9)      |1499451.694 ms |   647385 | avg:   0.940 ms | max:  27.969 ms | sum:608348.424 ms | max start:   467.219496 s | max end:   467.247465 s
  TOTAL:                |2369880.457 ms |  2797272 |                                     |   1243484.857 ms |
perf.data.eevdf_FAIR_SLEEPERS
  Task                  |   Runtime ms  | Switches | Avg delay ms    | Max delay ms    | Sum delay ms     | Max delay start           | Max delay end          |
  massive_intr:(9)      |1415743.272 ms |   714999 | avg:   1.013 ms | max:  73.722 ms | sum:724624.600 ms | max start:  2678.846216 s | max end:  2678.919938 s
  TOTAL:                |2362333.392 ms |  2871586 |                                     |   1238748.802 ms |
perf.data.master
  Task                  |   Runtime ms  | Switches | Avg delay ms    | Max delay ms    | Sum delay ms     | Max delay start           | Max delay end          |
  massive_intr:(9)      |1463798.673 ms |   598383 | avg:   0.730 ms | max:  40.029 ms | sum:437069.674 ms | max start:   945.022965 s | max end:   945.062994 s
  TOTAL:                |2370011.937 ms |  1109828 |                                     |    616408.789 ms |