Date: Mon, 31 Aug 2015 11:24:49 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Morten Rasmussen <morten.rasmussen@arm.com>
Cc: mingo@redhat.com, vincent.guittot@linaro.org, daniel.lezcano@linaro.org,
        Dietmar Eggemann <Dietmar.Eggemann@arm.com>, yuyang.du@intel.com,
        mturquette@baylibre.com, rjw@rjwysocki.net,
        Juri Lelli <Juri.Lelli@arm.com>, sgurrappadi@nvidia.com,
        pang.xunlei@zte.com.cn, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/6] sched/fair: Compute capacity invariant
 load/utilization tracking
Message-ID: <20150831092449.GJ19282@twins.programming.kicks-ass.net>
References: <1439569394-11974-1-git-send-email-morten.rasmussen@arm.com>
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On Fri, Aug 14, 2015 at 05:23:08PM +0100, Morten Rasmussen wrote:
> Target: ARM TC2 A7-only (x3)
> Test: hackbench -g 25 --threads -l 10000
> 
> Before	After
> 315.545	313.408	-0.68%
> 
> Target: Intel(R) Core(TM) i5 CPU M 520 @ 2.40GHz
> Test: hackbench -g 25 --threads -l 1000 (avg of 10)
> 
> Before	After
> 6.4643	6.395	-1.07%
> 

A quick run here gives:

IVB-EP (2*20*2):

perf stat --null --repeat 10 -- perf bench sched messaging -g 50 -l 5000

Before:				After:
5.484170711 ( +-  0.74% )	5.590001145 ( +-  0.45% )

Which is an almost 2% slowdown :/

I've yet to look at what happens.
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