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

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Message-ID: <20190619183302.GA6775@sinkpad>
Date:   Wed, 19 Jun 2019 14:33:02 -0400
From:   Julien Desfossez <jdesfossez@...italocean.com>
To:     Aubrey Li <aubrey.intel@...il.com>
Cc:     Subhra Mazumdar <subhra.mazumdar@...cle.com>,
        Aaron Lu <aaron.lu@...ux.alibaba.com>,
        Vineeth Remanan Pillai <vpillai@...italocean.com>,
        Nishanth Aravamudan <naravamudan@...italocean.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        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 17-Jun-2019 10:51:27 AM, Aubrey Li wrote:
> The result looks still unfair, and particularly, the variance is too high,

I just want to confirm that I am also seeing the same issue with a
similar setup. I also tried with the priority boost fix we previously
posted, the results are slightly better, but we are still seeing a very
high variance.

On average, the results I get for 10 30-seconds runs are still much
better than nosmt (both sysbench pinned on the same sibling) for the
memory benchmark, and pretty similar for the CPU benchmark, but the high
variance between runs is indeed concerning.

Still digging :-)

Thanks,

Julien