linux-kernel - Re: [PATCH v2 00/13] sched: Clean-ups and asymmetric cpu capacity support

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Message-ID: <20160708081817.GD12540@e105550-lin.cambridge.arm.com>
Date:	Fri, 8 Jul 2016 09:18:17 +0100
From:	Morten Rasmussen <morten.rasmussen@....com>
To:	KEITA KOBAYASHI <keita.kobayashi.ym@...esas.com>
Cc:	"peterz@...radead.org" <peterz@...radead.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"dietmar.eggemann@....com" <dietmar.eggemann@....com>,
	"yuyang.du@...el.com" <yuyang.du@...el.com>,
	"vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
	"mgalbraith@...e.de" <mgalbraith@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Gaku Inami <gaku.inami.xw@...renesas.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: Re: [PATCH v2 00/13] sched: Clean-ups and asymmetric cpu capacity
 support

On Fri, Jul 08, 2016 at 07:35:56AM +0000, KEITA KOBAYASHI wrote:
> Hi,
> 
> I tested these patches on Renesas SoC r8a7790(CA15*4 + CA7*4)
> and your preview branch[1] on Renesas SoC r8a7795(CA57*4 + CA53*4).
> 
> > Test 0:
> > 	for i in `seq 1 10`; \
> > 	       do sysbench --test=cpu --max-time=3 --num-threads=1 run;
> > \
> > 	       done \
> > 	| awk '{if ($4=="events:") {print $5; sum +=$5; runs +=1}} \
> > 	       END {print "Average events: " sum/runs}'
> > 
> > Target: ARM TC2 (2xA15+3xA7)
> > 
> > 	(Higher is better)
> > tip:	Average events: 146.9
> > patch:	Average events: 217.9
> > 
> Target: Renesas SoC r8a7790(CA15*4 + CA7*4)
>   w/  capacity patches: Average events: 200.2
>   w/o capacity patches: Average events: 144.4
> 
> Target: Renesas SoC r8a7795(CA57*4 + CA53*4)
>   w/  capacity patches : 3587.7
>   w/o capacity patches : 2327.8
> 
> > Test 1:
> > 	perf stat --null --repeat 10 -- \
> > 	perf bench sched messaging -g 50 -l 5000
> > 
> > Target: Intel IVB-EP (2*10*2)
> > 
> > tip:    4.861970420 seconds time elapsed ( +-  1.39% )
> > patch:  4.886204224 seconds time elapsed ( +-  0.75% )
> > 
> > Target: ARM TC2 A7-only (3xA7) (-l 1000)
> > 
> > tip:    61.485682596 seconds time elapsed ( +-  0.07% )
> > patch:  62.667950130 seconds time elapsed ( +-  0.36% )
> > 
> Target: Renesas SoC r8a7790(CA15*4) (-l 1000)
>   w/  capacity patches: 38.955532040 seconds time elapsed ( +-  0.12% )
>   w/o capacity patches: 39.424945580 seconds time elapsed ( +-  0.10% )
> 
> Target: Renesas SoC r8a7795(CA57*4) (-l 1000)
>   w/  capacity patches : 29.804292200 seconds time elapsed ( +-  0.37% )
>   w/o capacity patches : 29.838826790 seconds time elapsed ( +-  0.40% )
> 
> Tested-by: Keita Kobayashi <keita.kobayashi.ym@...esas.com>

Thank you for testing and sharing your test results. They seem to show a
significant improvement in throughput which is in line with the
measurement we have for the ARM dev boards and the MediaTek SoC.

Thanks,
Morten