linux-kernel - Re: [RFC -v5 PATCH 0/4] directed yield for Pause Loop Exiting

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Message-ID: <4D30891B.9010104@redhat.com>
Date:	Fri, 14 Jan 2011 12:34:19 -0500
From:	Rik van Riel <riel@...hat.com>
To:	kvm@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, Avi Kiviti <avi@...hat.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>,
	Chris Wright <chrisw@...s-sol.org>, ttracy@...hat.com,
	dshaks@...hat.com
Subject: Re: [RFC -v5 PATCH 0/4] directed yield for Pause Loop Exiting

On 01/14/2011 03:02 AM, Rik van Riel wrote:

> Benchmark "results":
>
> Two 4-CPU KVM guests are pinned to the same 4 physical CPUs.

I just discovered that I had in fact pinned the 4-CPU KVM
guests to 4 HT threads across 2 cores, and the scheduler
has all kinds of special magic for dealing with HT siblings.

I am now rerunning the tests with the KVM guests bound to
cores 0,2,4,6 to see if that makes a difference.

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