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Date:   Tue, 5 Oct 2021 12:36:22 +0200
From:   Peter Zijlstra <>
To:     Phil Auld <>
Cc:     Vincent Guittot <>,
        Mike Galbraith <>,
        Mel Gorman <>,
        Ingo Molnar <>,
        Valentin Schneider <>,
        Aubrey Li <>,
        Barry Song <>,
        Srikar Dronamraju <>,
        LKML <>
Subject: Re: [PATCH 2/2] sched/fair: Scale wakeup granularity relative to

On Thu, Sep 23, 2021 at 08:24:03AM -0400, Phil Auld wrote:

> It's capped at 8 cpus, which is pretty easy to reach these days, so the
> values don't get too large.  That scaling is almost a no-op these days.

Ooh, hey, we already fixed that :-)

So the reasoning there is that if the values get too big, interactiviy
get *really* bad, but if you go from say 1 to 4 CPUs, interactivity can
improve due to being able to run on other CPUs.

At 8 CPUs we end up at 6ms*4=24ms, which is already pretty terrible.

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