linux-kernel - Re: [RFC][PATCH 0/7] sched: select_idle

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Date:	Wed, 11 May 2016 10:19:28 -0400
From:	Chris Mason <clm@...com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<mingo@...nel.org>, <linux-kernel@...r.kernel.org>,
	<matt@...eblueprint.co.uk>, <mgalbraith@...e.de>,
	<tglx@...utronix.de>, <fweisbec@...il.com>
Subject: Re: [RFC][PATCH 0/7] sched: select_idle_siblings rewrite

On Mon, May 09, 2016 at 12:48:07PM +0200, Peter Zijlstra wrote:
> Hai,
> 
> here be a semi coherent patch series for the recent select_idle_siblings()
> tinkering. Happy benchmarking..

I ran a few more rounds of the production benchmarks, and NO_AVG_CPU is
consistently faster by about 5% than AVG_CPU.  I think what's happening
here is the production runs are ramping up load in a finer grained setup
than schbench, and production is able to see the AVG_CPU calculations
back off the scan too soon (for us anyway).

I'm going to play around with schbench to try and model this better, but
so far this is a clear win over unpatched v4.6.

-chris