linux-kernel - Re: sched: tweak select_idle_sibling to look for idle threads

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Message-ID: <20160501085303.GF2975@worktop.cust.blueprintrf.com>
Date:	Sun, 1 May 2016 10:53:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <mgalbraith@...e.de>
Cc:	Chris Mason <clm@...com>, Ingo Molnar <mingo@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: sched: tweak select_idle_sibling to look for idle threads

On Sun, May 01, 2016 at 09:12:33AM +0200, Mike Galbraith wrote:
> On Sat, 2016-04-30 at 14:47 +0200, Peter Zijlstra wrote:

> > Can you guys have a play with this; I think one and two node tbench are
> > good, but I seem to be getting significant run to run variance on that,
> > so maybe I'm not doing it right.
> 
> Nah, tbench is just variance prone.  It got dinged up at clients=cores
> on my desktop box, on 4 sockets the high end got seriously dinged up.

Ouch, yeah, big hurt. Lets try that again... :-)