From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: AW: AW: AW: AW: AW: KVM performance Date: Thu, 16 Apr 2009 17:40:59 +0300 Message-ID: <49E7437B.8040705@redhat.com> References: <133D9897FB9C5E4E9DF2779DC91E947C518348@SLFSNX.rcs.alcatel-research.de> <49D9EB48.4030709@redhat.com> <133D9897FB9C5E4E9DF2779DC91E947C51834A@SLFSNX.rcs.alcatel-research.de> <49DA2F54.8090109@redhat.com> <133D9897FB9C5E4E9DF2779DC91E947C51834E@SLFSNX.rcs.alcatel-research.de> <49DB8E8A.1090908@redhat.com> <133D9897FB9C5E4E9DF2779DC91E947C518350@SLFSNX.rcs.alcatel-research.de> <133D9897FB9C5E4E9DF2779DC91E947C518355@SLFSNX.rcs.alcatel-research.de> <49E0C30B.1000209@redhat.com> <133D9897FB9C5E4E9DF2779DC91E947C518356@SLFSNX.rcs.alcatel-research.de> <49E44DB6.3010701@redhat.com> <133D9897FB9C5E4E9DF2779DC91E947C518365@SLFSNX.rcs.alcatel-research.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: "BRAUN, Stefanie" Return-path: Received: from mx2.redhat.com ([66.187.237.31]:47149 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752873AbZDPOlL (ORCPT ); Thu, 16 Apr 2009 10:41:11 -0400 In-Reply-To: <133D9897FB9C5E4E9DF2779DC91E947C518365@SLFSNX.rcs.alcatel-research.de> Sender: kvm-owner@vger.kernel.org List-ID: BRAUN, Stefanie wrote: > Hello, > I've compiled a new kernel v2.6.27-rc5 with the modified svm.c. > But the behaviour of the vlc process in the guest is still the same. > > I've exported additional cpu features to the guest, e.g. mmxext with kvm-84. > But no performance changes. > > I was not able to export the cpu flags 3dnow and 3dnowext to the guest, no error but they are not visible in /proc/cpuinfo. Not sure why. > > Can you test on an intel host (relative performance host vs guest)? -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.