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Date:   Mon, 6 Jul 2020 11:41:12 +0100
From:   Qais Yousef <>
To:     Vincent Guittot <>
Cc:     Ingo Molnar <>,
        Peter Zijlstra <>,
        Valentin Schneider <>,
        Juri Lelli <>,
        Dietmar Eggemann <>,
        Steven Rostedt <>,
        Ben Segall <>, Mel Gorman <>,
        Patrick Bellasi <>,
        Chris Redpath <>,
        Lukasz Luba <>,
        linux-kernel <>
Subject: Re: [PATCH v6 0/2] sched: Optionally skip uclamp logic in fast path

On 07/03/20 14:09, Vincent Guittot wrote:
> I have run the perf bench sched pipe that have have already run
> previously with this v6 and the results are similar to my previous
> tests:
> The impact is -1.61% similarly to v2 which is better compared the
> original -3.66% without your patch

Thanks Vincent.

Can you afford doing a capture of `perf record` and share the resulting
perf.dat with vmlinux (with debug symbols)?

Having a before/after capture would be even better.

Not sure if we can do  much about this -1.61% in your case, but it'd be good to
understand why if possible. perf bench sched pipe is very sensitive to tiniest
of changes which could be due to binary-to-binary differences.


Qais Yousef

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