linux-kernel - Re: [RFC PATCH v3 00/16] Core scheduling v3

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Date:   Fri, 19 Jul 2019 19:48:42 +0800
From:   Aubrey Li <aubrey.intel@...il.com>
To:     Aaron Lu <aaron.lu@...ux.alibaba.com>
Cc:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Subhra Mazumdar <subhra.mazumdar@...cle.com>,
        Vineeth Remanan Pillai <vpillai@...italocean.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Turner <pjt@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kerr <kerrnel@...gle.com>, Phil Auld <pauld@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC PATCH v3 00/16] Core scheduling v3

On Fri, Jul 19, 2019 at 1:53 PM Aaron Lu <aaron.lu@...ux.alibaba.com> wrote:
>
> On Thu, Jul 18, 2019 at 04:27:19PM -0700, Tim Chen wrote:
> >
> >
> > On 7/18/19 3:07 AM, Aaron Lu wrote:
> > > On Wed, Jun 19, 2019 at 02:33:02PM -0400, Julien Desfossez wrote:
> >
> > >
> > > With the below patch on top of v3 that makes use of util_avg to decide
> > > which task win, I can do all 8 steps and the final scores of the 2
> > > workloads are: 1796191 and 2199586. The score number are not close,
> > > suggesting some unfairness, but I can finish the test now...
> >
> > Aaron,
> >
> > Do you still see high variance in terms of workload throughput that
> > was a problem with the previous version?
>
> Any suggestion how to measure this?
> It's not clear how Aubrey did his test, will need to take a look at
> sysbench.
>

Well, thanks to post this at the end of my vacation, ;)
I'll go back to the office next week and give a shot.
I actually have a new setup of co-locating AVX512 tasks with
sysbench MYSQL. Both throughput and latency was unacceptable
on the top of V3, Looking forward to seeing the difference of
patch.

Thanks,
-Aubrey