linux-kernel - Re: [RFC] sched: The removal of idle

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Message-ID: <1361082379.6088.22.camel@marge.simpson.net>
Date:	Sun, 17 Feb 2013 07:26:19 +0100
From:	Mike Galbraith <efault@....de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Clark Williams <clark@...hat.com>,
	Andrew Theurer <habanero@...ibm.com>
Subject: Re: [RFC] sched: The removal of idle_balance()

On Fri, 2013-02-15 at 01:13 -0500, Steven Rostedt wrote: 
> I've been working on cleaning up the scheduler a little and I moved the
> call to idle_balance() from directly in the scheduler proper into the
> idle class. Benchmarks (well hackbench) improved slightly as I did this.
> I was adding some more tweaks and running perf stat on the results when
> I made a mistake and notice a drastic change.
> 
> My runs looked something like this on my i7 4 core 4 hyperthreads:
> 

> 293,801,912,874 cycles                    #    1.470 GHz                      ( +-  4.20% ) [100.00%]

> 215,927,081,108 cycles                    #    2.198 GHz                      ( +-  5.48% ) [100.00%]

Hm.  Maybe set governor to performance?

-Mike

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