From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric B Munson <emunson@mgebm.net>
Subject: Re: [PATCH v2 6/7] KVM-GST: adjust scheduler cpu power
Date: Thu, 16 Jun 2011 20:49:10 -0400
Message-ID: <20110617004910.GG27252@mgebm.net>
References: <1308262856-5779-1-git-send-email-glommer@redhat.com>
 <1308262856-5779-7-git-send-email-glommer@redhat.com>
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Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Rik van Riel <riel@redhat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Avi Kivity <avi@redhat.com>,
	Anthony Liguori <aliguori@us.ibm.com>
To: Glauber Costa <glommer@redhat.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org
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On Thu, 16 Jun 2011, Glauber Costa wrote:

> This is a first proposal for using steal time information
> to influence the scheduler. There are a lot of optimizations
> and fine grained adjustments to be done, but it is working reasonably
> so far for me (mostly)
>=20
> With this patch (and some host pinnings to demonstrate the situation),
> two vcpus with very different steal time (Say 80 % vs 1 %) will not get
> an even distribution of processes. This is a situation that can naturally
> arise, specially in overcommited scenarios. Previosly, the guest scheduler
> would wrongly think that all cpus have the same ability to run processes,
> lowering the overall throughput.
>=20
> Signed-off-by: Glauber Costa <glommer@redhat.com>
> CC: Rik van Riel <riel@redhat.com>
> CC: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
> CC: Peter Zijlstra <peterz@infradead.org>
> CC: Avi Kivity <avi@redhat.com>
> CC: Anthony Liguori <aliguori@us.ibm.com>
> CC: Eric B Munson <emunson@mgebm.net>

Tested-by: Eric B Munson <emunson@mgebm.net>

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