From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: Poor write- and overall performance Date: Mon, 15 Dec 2008 08:38:28 +0200 Message-ID: <4945FB64.3040109@redhat.com> References: <49459A51.7040905@opengeo.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Arne Kepp Return-path: Received: from mx2.redhat.com ([66.187.237.31]:54326 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751125AbYLOGiW (ORCPT ); Mon, 15 Dec 2008 01:38:22 -0500 In-Reply-To: <49459A51.7040905@opengeo.org> Sender: kvm-owner@vger.kernel.org List-ID: Arne Kepp wrote: > Hi, > > I'm testing KVM 80 (prepackaged from lfarkas.org) on CentOS 5.2 (both > guest and host) and comparing against Xen 3.3.0. The only modification > I've really made is that I've set noatime on both guest and host. The > guest is running straight from an LVM volume and is assigned 4 Gb RAM > and 4 virtual CPUs. I suggest trying scsi in kvm-81, or setting cache=writeback if you want to keep using IDE (but be aware of the potential for severe data loss with the latter option). -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.