From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ryan Harper Subject: Re: qcow2 slowdown in kvm-78,79 Date: Wed, 19 Nov 2008 12:23:17 -0600 Message-ID: <20081119182317.GA31893@us.ibm.com> References: <1227019192.22098.4.camel@henrik-desktop> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org To: Henrik Holst Return-path: Received: from e34.co.us.ibm.com ([32.97.110.152]:45371 "EHLO e34.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753767AbYKSSX6 (ORCPT ); Wed, 19 Nov 2008 13:23:58 -0500 Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e34.co.us.ibm.com (8.13.1/8.13.1) with ESMTP id mAJIN6Fg003032 for ; Wed, 19 Nov 2008 11:23:06 -0700 Received: from d03av03.boulder.ibm.com (d03av03.boulder.ibm.com [9.17.195.169]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.1) with ESMTP id mAJINY26106060 for ; Wed, 19 Nov 2008 11:23:36 -0700 Received: from d03av03.boulder.ibm.com (loopback [127.0.0.1]) by d03av03.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id mAJINUrG029415 for ; Wed, 19 Nov 2008 11:23:31 -0700 Content-Disposition: inline In-Reply-To: <1227019192.22098.4.camel@henrik-desktop> Sender: kvm-owner@vger.kernel.org List-ID: * Henrik Holst [2008-11-18 08:42]: > The bundled qemu in kvm-78 and kvm-79 slows down disk i/o with qcow2 > images by an order of 10. If one got 60MB/s before, one gets around > 6MB/s with 78 and 79 (measured with dd) dd command? what's your -drive parameters look like, specifically, what if type? ide, scsi, virtio? -- Ryan Harper Software Engineer; Linux Technology Center IBM Corp., Austin, Tx ryanh@us.ibm.com