From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754743Ab2F1QCG (ORCPT ); Thu, 28 Jun 2012 12:02:06 -0400 Received: from mx4-phx2.redhat.com ([209.132.183.25]:38409 "EHLO mx4-phx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752693Ab2F1QCC (ORCPT ); Thu, 28 Jun 2012 12:02:02 -0400 Date: Thu, 28 Jun 2012 12:00:46 -0400 (EDT) From: Andrew Jones To: Raghavendra K T Cc: Rik van Riel , Marcelo Tosatti , Srikar , Srivatsa Vaddagiri , Peter Zijlstra , "Nikunj A. Dadhania" , KVM , LKML , Gleb Natapov , chegu vinod , Jeremy Fitzhardinge , Avi Kivity , Ingo Molnar Subject: Re: [PATCH] kvm: handle last_boosted_vcpu = 0 case Message-ID: <168f205d-d65f-4864-99c8-363b12818a9b@zmail17.collab.prod.int.phx2.redhat.com> In-Reply-To: <4FEB6CAC.1020406@linux.vnet.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit MIME-Version: 1.0 X-Originating-IP: [70.43.169.206] X-Mailer: Zimbra 7.1.2_GA_3268 (ZimbraWebClient - FF3.0 (Win)/7.1.2_GA_3268) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ----- Original Message ----- > In summary, current PV has huge benefit on non-PLE machine. > > On PLE machine, the results become very sensitive to load, type of > workload and SPIN_THRESHOLD. Also PLE interference has significant > effect on them. But still it has slight edge over non PV. > Hi Raghu, sorry for my slow response. I'm on vacation right now (until the 9th of July) and I have limited access to mail. Also, thanks for continuing the benchmarking. Question, when you compare PLE vs. non-PLE, are you using different machines (one with and one without), or are you disabling its use by loading the kvm module with the ple_gap=0 modparam as I did? Drew