From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Tokarev Subject: Re: slow guest performance with build load, looking for ideas Date: Tue, 16 Jun 2009 11:03:29 +0400 Message-ID: <4A3743C1.6090108@msgid.tls.msk.ru> References: <20090612210443.GA21840@sgi.com> <4A34C3D2.9020009@redhat.com> <20090615141542.GA17448@sgi.com> <4A36598E.5050300@redhat.com> <4A3667F2.3040201@msgid.tls.msk.ru> <4A36685E.7090003@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Erik Jacobson , kvm@vger.kernel.org To: Avi Kivity Return-path: Received: from isrv.corpit.ru ([81.13.33.159]:55541 "EHLO isrv.corpit.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751021AbZFPHD3 (ORCPT ); Tue, 16 Jun 2009 03:03:29 -0400 In-Reply-To: <4A36685E.7090003@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: Avi Kivity wrote: > On 06/15/2009 06:25 PM, Michael Tokarev wrote: >> Avi Kivity wrote: >>> On 06/15/2009 05:15 PM, Erik Jacobson wrote: >> [] >>>> So if I understand what you're saying: best not to use kvm guests for build >>>> servers with pre-Nehalem processors. >>> >>> pre-Nehalem / pre-Barcelona, > 4 vcpus, yes. >> >> How about 2 vcpus, and how about AMD processors ? > > 2 vcpus (or 4) should be fine. AMD processors (Barcelona+) would be > good for any number of vcpus. Hmm.. that's sorta good (not so good for owners of most Intel CPUs -- Nehalem just started its life). But still confusing. Namely, 2..4 vcpus per GUEST or HOST -- for the ore-Nehalem ones? :) Thanks! /mjt