From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: performance trouble Date: Mon, 19 Mar 2012 12:51:34 +0200 Message-ID: <20120319105134.GA27928@redhat.com> References: <20120214134030.GD18866@redhat.com> <20120216085553.GX26955@nfs-rbx.ovh.net> <20120216090126.GC19771@redhat.com> <20120217085939.GZ26955@nfs-rbx.ovh.net> <20120217100714.GB29601@redhat.com> <20120217140107.GA26955@nfs-rbx.ovh.net> <20120219091315.GA10038@redhat.com> <20120222163356.GE26955@nfs-rbx.ovh.net> <20120223083807.GA17505@redhat.com> <20120316101331.GM12293@nfs-rbx.ovh.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Avi Kivity , kvm@vger.kernel.org, Vadim Rozenfeld To: David Cure Return-path: Received: from mx1.redhat.com ([209.132.183.28]:31443 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932395Ab2CSKvl (ORCPT ); Mon, 19 Mar 2012 06:51:41 -0400 Content-Disposition: inline In-Reply-To: <20120316101331.GM12293@nfs-rbx.ovh.net> Sender: kvm-owner@vger.kernel.org List-ID: On Fri, Mar 16, 2012 at 11:13:31AM +0100, David Cure wrote: > hello, > > sorry for the delay, > > Le Thu, Feb 23, 2012 at 10:38:07AM +0200, Gleb Natapov ecrivait : > > > > Ah, I guess the reason is that it records events only of IO thread. You > > need to trace all vcpu threads too. Not sure trace-cmd allows more then > > one -P option though. > > I manage to have the physical server with only one VM with the > slowly function and take trace during the slowly function. > I upload trace in http://www.roullier.net/Report/ with : > o report.txt.3.1.gz : with kernel 3.1 > o report.txt.3.2.gz : with kernel 3.2 > o report.txt.vhost-net-3.1.gz : with kernel 3.1 and vhost-net > o report.txt.vhost-net.3.2.gz : with kernel 3.2 and vhost-net > > With 3.2 + vhost-net we have 10.5s (to remember 8s with > vmware esxi 4). > Can you run the same test on Linux guest and on Windows vm with 1 cpu? I see a lot of IPIs between vcpus. -- Gleb.