From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dor Laor Subject: Re: virtio disk slower than IDE? Date: Sun, 15 Nov 2009 11:51:20 +0200 Message-ID: <4AFFCF18.1080509@redhat.com> References: <4AFEBD59.2090002@bobich.net> Reply-To: dlaor@redhat.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org To: Gordan Bobic Return-path: Received: from mx1.redhat.com ([209.132.183.28]:65118 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752465AbZKOJv2 (ORCPT ); Sun, 15 Nov 2009 04:51:28 -0500 In-Reply-To: <4AFEBD59.2090002@bobich.net> Sender: kvm-owner@vger.kernel.org List-ID: On 11/14/2009 04:23 PM, Gordan Bobic wrote: > I just tried paravirtualized virtio block devices, and my tests show > that they are approximately 30% slower than emulated IDE devices. I'm > guessing this isn't normal. Is this a known issue or am I likely to have > mosconfigured something? I'm using 64-bit RHEL/CentOS 5 (both host and > guest). Please try to change the io scheduler on the host to io scheduler, it should boost your performance back. > > Thanks. > > Gordan > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html