From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [RFC] vhost-blk implementation Date: Tue, 23 Mar 2010 12:05:10 +0200 Message-ID: <4BA89256.4030100@redhat.com> References: <1269306023.7931.72.camel@badari-desktop> <4BA81685.9060809@codemonkey.ws> <4BA81D2F.1020405@us.ibm.com> <4BA820AE.7090803@codemonkey.ws> <4BA82C5B.8010808@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Anthony Liguori , kvm@vger.kernel.org To: Badari Pulavarty Return-path: Received: from mx1.redhat.com ([209.132.183.28]:36599 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753781Ab0CWKFO (ORCPT ); Tue, 23 Mar 2010 06:05:14 -0400 In-Reply-To: <4BA82C5B.8010808@us.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: On 03/23/2010 04:50 AM, Badari Pulavarty wrote: > Anthony Liguori wrote: >> On 03/22/2010 08:45 PM, Badari Pulavarty wrote: >>> Anthony Liguori wrote: >>>> On 03/22/2010 08:00 PM, Badari Pulavarty wrote: >>>>> Forgot to CC: KVM list earlier >>>> >>>> >>>> These virtio results are still with a 2.6.18 kernel with no aio, >>>> right? >>> Results are on 2.6.33-rc8-net-next kernel. But not using AIO. >> >> Can you try with aio and cache=none? > > aio-native,cache=none > > # time dd if=/dev/vda of=/dev/null bs=128k iflag=direct > 640000+0 records in > 640000+0 records out > 83886080000 bytes (84 GB) copied, 470.588 seconds, 170 MB/s > You're effectively killing readahead with this. Please use fio with a sequential pattern, queue depth > 1. -- error compiling committee.c: too many arguments to function