From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: [PATCH] qemu-kvm: response to SIGUSR1 to start/stop a VCPU (v2) Date: Wed, 01 Dec 2010 14:42:56 -0500 Message-ID: <4CF6A540.9050608@redhat.com> References: <1290530963-3448-1-git-send-email-aliguori@us.ibm.com> <4CECCA39.4060702@redhat.com> <4CED1A23.9030607@linux.vnet.ibm.com> <4CED1FD3.1000801@redhat.com> <20101201123742.GA3780@linux.vnet.ibm.com> <4CF6460C.5070604@redhat.com> <20101201161221.GA8073@linux.vnet.ibm.com> <1291220718.32004.1696.camel@laptop> <20101201171758.GA8514@sequoia.sous-sol.org> <1291224176.32004.1763.camel@laptop> <4CF6854C.4020500@redhat.com> <1291230476.32004.1922.camel@laptop> <4CF6A0E4.1050108@redhat.com> <1291232136.32004.1964.camel@laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Chris Wright , vatsa@linux.vnet.ibm.com, Avi Kivity , Anthony Liguori , qemu-devel@nongnu.org, kvm@vger.kernel.org, Ingo Molnar , Mike Galbraith To: Peter Zijlstra Return-path: Received: from mx1.redhat.com ([209.132.183.28]:35019 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756576Ab0LATn1 (ORCPT ); Wed, 1 Dec 2010 14:43:27 -0500 In-Reply-To: <1291232136.32004.1964.camel@laptop> Sender: kvm-owner@vger.kernel.org List-ID: On 12/01/2010 02:35 PM, Peter Zijlstra wrote: > On Wed, 2010-12-01 at 14:24 -0500, Rik van Riel wrote: >> Even if we equalized the amount of CPU time each VCPU >> ends up getting across some time interval, that is no >> guarantee they get useful work done, or that the time >> gets fairly divided to _user processes_ running inside >> the guest. > > Right, and Jeremy was working on making the guest load-balancer aware of > that so the user-space should get fairly scheduled on service (of > course, that's assuming you run a linux guest with that logic in). At that point, you might not need the host side balancing any more, since the guest can move around processes internally (if needed). -- All rights reversed