From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Jackson Subject: Re: performance trouble Date: Mon, 30 Jan 2012 10:20:34 -0600 Message-ID: <201201301020.35161.iggy@theiggy.com> References: <20120123082837.GC26955@nfs-rbx.ovh.net> <20120130153655.GI26955@nfs-rbx.ovh.net> Mime-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: David Cure Return-path: Received: from theiggy.com ([66.220.1.110]:44736 "EHLO mail.theiggy.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753861Ab2A3Qpj (ORCPT ); Mon, 30 Jan 2012 11:45:39 -0500 In-Reply-To: <20120130153655.GI26955@nfs-rbx.ovh.net> Sender: kvm-owner@vger.kernel.org List-ID: On Monday, January 30, 2012 09:36:55 AM David Cure wrote: > 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. Without more info or some way to reproduce the problem, it would be pointless for one of the devs to spend much time on it.