linux-kernel - Re: [PATCH] sched: smart wake-affine

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Date:	Mon, 08 Jul 2013 11:59:58 -0700
From:	Davidlohr Bueso <davidlohr.bueso@...com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Alex Shi <alex.shi@...el.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH] sched: smart wake-affine

On Mon, 2013-07-08 at 10:21 +0200, Peter Zijlstra wrote:
> On Sun, Jul 07, 2013 at 08:43:25AM +0200, Mike Galbraith wrote:
> > On Fri, 2013-07-05 at 14:16 +0800, Michael Wang wrote:
> > 
> > > PeterZ has suggested some optimization which I sent out yesterday, I
> > > suppose they haven't been included into this test yet, correct?
> > 
> > No, that was with both v3 patches applied.  hackbench -l 1000 delta
> > tracked to next pull/build fwiw, but I don't see anything noteworthy
> > elsewhere, so I'm filing it under "tasks/core ~= zillion ~= hohum".
> 
> OK, I'll apply the patches, we'll see what happens. If there significant
> fallout we'll immediately have more information anyway ;-)

So I gave the v2 a spin on my aim7 benchmark on an 80-core 8 socket
DL980. Not much changed, most numbers are in the noise range, however,
with HT off, the high_systime workload suffered in throughput with this
patch with higher concurrency (after 600 users). Image attached.

Thanks,
Davidlohr

Download attachment "high_systime-htoff.jpg" of type "image/jpeg" (58246 bytes)