linux-kernel - Re: sched: Avoid SMT siblings in select_idle

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Message-ID: <1329820643.2293.386.camel@twins>
Date:	Tue, 21 Feb 2012 11:37:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mike Galbraith <efault@....de>
Cc:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>
Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible

On Tue, 2012-02-21 at 10:21 +0100, Mike Galbraith wrote:

> I use vmark, find it _somewhat_ useful.  Not a lovely benchmark, but it
> is highly affinity sensitive, and switches heftily.  I don't put much
> value on it though, too extreme for me, but it is a ~decent indicator.
> 
> There are no doubt _lots_ better than vmark for java stuff.
> 
> I toss a variety pack at the box in obsessive-compulsive man mode when
> testing.  Which benchmarks doesn't matter much, just need to be wide
> spectrum and consistent.

http://www.volano.com/benchmarks.html

> No, I use Ingo's pipe-test, but that to measure fastpath overhead.

http://people.redhat.com/mingo/cfs-scheduler/tools/pipe-test.c

Also I think it lives as: perf bench sched pipe
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