From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH v2 00/11] KVM in-guest performance monitoring Date: Thu, 16 Jun 2011 17:20:56 +0300 Message-ID: <4DFA1148.6070306@redhat.com> References: <1307972106-2468-1-git-send-email-avi@redhat.com> <4DF66B1A.6060606@cisco.com> <4DF71DA3.2080300@redhat.com> <4DF7972F.3040103@cisco.com> <4DF79941.9050705@siemens.com> <4DF79B6F.10102@cisco.com> <4DF79EFE.1050201@cisco.com> <4DF7A436.8090308@cisco.com> <4DF873FD.6040903@redhat.com> <4DF8A82F.5090900@cisco.com> <4DF8B1F8.6030502@redhat.com> <4DF8D8FE.2080808@cisco.com> <4DF8DD87.8040905@redhat.com> <4DF8E328.6070708@cisco.com> <4DFA0AC4.9050702@redhat.com> <4DFA0E56.70301@cisco.com> <4DFA10DA.4030704@cisco.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , kvm@vger.kernel.org, Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo To: David Ahern Return-path: Received: from mx1.redhat.com ([209.132.183.28]:47395 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758106Ab1FPOVM (ORCPT ); Thu, 16 Jun 2011 10:21:12 -0400 In-Reply-To: <4DFA10DA.4030704@cisco.com> Sender: kvm-owner@vger.kernel.org List-ID: On 06/16/2011 05:19 PM, David Ahern wrote: > On 06/16/2011 08:08 AM, David Ahern wrote: > > Command: > > perf stat -e instructions openssl speed aes > > Hmm.. this might be the wrong benchmark for this. I thought > openssl-speed was a purely CPU intensive benchmark which should have > fairly similar performance numbers in both host and guest. I seem to > recall this as true 2 or so years ago, but that is not the case with > 3.0-rc2 and F14. > > Using a benchmark Vince W. wrote seems better: > http://www.csl.cornell.edu/~vince/projects/perf_counter/million.s > > perf stat -e instructions ./million > > Performance counter stats for './million': > > 1,113,650 instructions # 0.00 insns per cycle > Maybe it's sensitive to a cpuid bit which we don't pass through - likely a bug in qemu or perhaps in kvm. -- error compiling committee.c: too many arguments to function