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Date:	Thu, 23 Feb 2012 17:17:09 +0100
From:	Ingo Molnar <>
To:	Srivatsa Vaddagiri <>
Cc:	Mike Galbraith <>,
	Peter Zijlstra <>,
	Suresh Siddha <>,
	linux-kernel <>,
	Paul Turner <>
Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible

* Srivatsa Vaddagiri <> wrote:

> * Ingo Molnar <> [2012-02-23 12:26:50]:
> > pro perf tip of the day: did you know that it's possible to run:
> > 
> >   perf stat --repeat 10 --null perf bench sched pipe
> Ah yes ..had forgotten that! What is the recommended # of 
> iterations to run?

Well, I start at 3 or 5 and sometimes increase it to get a 
meaningful stddev - i.e. one that is smaller than half of the 
measured effect. (for cases where I expect an improvement and 
want to measure it.)


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