From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754207Ab1LUTLh (ORCPT ); Wed, 21 Dec 2011 14:11:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:48411 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753215Ab1LUTLf (ORCPT ); Wed, 21 Dec 2011 14:11:35 -0500 Date: Wed, 21 Dec 2011 14:11:17 -0500 From: Vivek Goyal To: Minchan Kim Cc: Rusty Russell , Chris Wright , Jens Axboe , Stefan Hajnoczi , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , Minchan Kim Subject: Re: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO Message-ID: <20111221191117.GA27789@redhat.com> References: <1324429254-28383-1-git-send-email-minchan@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1324429254-28383-1-git-send-email-minchan@kernel.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 21, 2011 at 10:00:48AM +0900, Minchan Kim wrote: > This patch is follow-up of Christohp Hellwig's work > [RFC: ->make_request support for virtio-blk]. > http://thread.gmane.org/gmane.linux.kernel/1199763 > > Quote from hch > "This patchset allows the virtio-blk driver to support much higher IOP > rates which can be driven out of modern PCI-e flash devices. At this > point it really is just a RFC due to various issues." > > I fixed race bug and add batch I/O for enhancing sequential I/O, > FLUSH/FUA emulation. > > I tested this patch on fusion I/O device by aio-stress. > Result is following as. > > Benchmark : aio-stress (64 thread, test file size 512M, 8K io per IO, O_DIRECT write) > Environment: 8 socket - 8 core, 2533.372Hz, Fusion IO 320G storage > Test repeated by 20 times > Guest I/O scheduler : CFQ > Host I/O scheduler : NOOP May be using deadline or noop in guest is better to benchmark against PCI-E based flash. Thanks Vivek