From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Cure Subject: Re: performance trouble Date: Mon, 30 Jan 2012 16:36:55 +0100 Message-ID: <20120130153655.GI26955@nfs-rbx.ovh.net> References: <20120123082837.GC26955@nfs-rbx.ovh.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: kvm@vger.kernel.org Return-path: Received: from gandalf.cure.nom.fr ([91.121.137.146]:57272 "EHLO gandalf.cure.nom.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753593Ab2A3Pg5 (ORCPT ); Mon, 30 Jan 2012 10:36:57 -0500 Received: from gandalf.cure.nom.fr (localhost.localdomain [127.0.0.1]) by gandalf.cure.nom.fr (8.14.3/8.14.3/Debian-5+lenny1) with ESMTP id q0UFats0011150 for ; Mon, 30 Jan 2012 16:36:55 +0100 Received: (from david@localhost) by gandalf.cure.nom.fr (8.14.3/8.14.3/Submit) id q0UFatli011149 for kvm@vger.kernel.org; Mon, 30 Jan 2012 16:36:55 +0100 Content-Disposition: inline In-Reply-To: <20120123082837.GC26955@nfs-rbx.ovh.net> Sender: kvm-owner@vger.kernel.org List-ID: Le Mon, Jan 23, 2012 at 09:28:37AM +0100, David Cure ecrivait : > > I use several kvm box, and no problem at all except for 1 > application that have bad response time. > > The VM runs Windows 2008R2 and the application is an > client-server app develop with progress software and talk to an Oracle > databasei (on another server) and we access this app with RDS/TSE. > The physical server runs Debian testing to have qemu-kvm 1.0 and > linux kernel 3.1 and libvirt 0.9.8. We use virtio for disk and network > and use the last driver for Windows (from RH). > > We have 2 references servers : one physical and one running > Vmware. > > Response time : > o physical = 7s > o VM under vmware = 8s > o VM under KVM = 12s (to complete with qemu-kvm 0.12.5 and > kernel 2.6.32 we have 22s ...). > > I attach the libvirt xml of my vm. > > How can I see what's append ? Do you have idea to increase > performance ? no one interesting to try to track this issue where kvm is so slow ? David.