From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Cure Subject: Re: performance trouble Date: Fri, 16 Mar 2012 11:13:31 +0100 Message-ID: <20120316101331.GM12293@nfs-rbx.ovh.net> References: <4F3A6260.7050208@redhat.com> <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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Avi Kivity , kvm@vger.kernel.org, Vadim Rozenfeld To: Gleb Natapov Return-path: Received: from gandalf.cure.nom.fr ([91.121.137.146]:48366 "EHLO gandalf.cure.nom.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1032703Ab2CPKNh (ORCPT ); Fri, 16 Mar 2012 06:13:37 -0400 Content-Disposition: inline In-Reply-To: <20120223083807.GA17505@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: 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). David.