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

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Message-ID: <1332750960.16159.81.camel@twins>
Date:	Mon, 26 Mar 2012 10:36:00 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Paul Turner <pjt@...gle.com>
Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible

On Thu, 2012-03-22 at 21:02 +0530, Srivatsa Vaddagiri wrote:
> 
> Now the more interesting VM scenario:
> 
More interesting for whoem? I still think virt is an utter waste of
time ;-)

>                 tip     tip + patch
> 
> volano          1       1.29   (29% improvement)
> sysbench [n3]   1       2      (100% improvement)
> tbench 1 [n4]   1       1.07   (7% improvement)
> tbench 8 [n5]   1       1.26   (26% improvement)
> httperf  [n6]   1       1.05   (5% improvement)
> Trade           1       1.31   (31% improvement) 

That smells like there's more to the story, a 100% improvement is too
much..
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