linux-kernel - Re: [PATCH 4/4] sched/fair: Use a recently used CPU as an idle candidate and the basis for SIS

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Message-ID: <20180130115349.GB2269@hirez.programming.kicks-ass.net>
Date:   Tue, 30 Jan 2018 12:53:49 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Mike Galbraith <efault@....de>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] sched/fair: Use a recently used CPU as an idle
 candidate and the basis for SIS

On Tue, Jan 30, 2018 at 10:45:55AM +0000, Mel Gorman wrote:
> The results can be less dramatic on NUMA where automatic balancing interferes
> with the test. It's also known that network benchmarks running on localhost
> also benefit quite a bit from this patch (roughly 10% on netperf RR for UDP
> and TCP depending on the machine). Hackbench also seens small improvements
> (6-11% depending on machine and thread count). The facebook schbench was also
> tested but in most cases showed little or no different to wakeup latencies.

What cpufreq setting were you using for these tests?