From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752966Ab2GPJDb (ORCPT ); Mon, 16 Jul 2012 05:03:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:27078 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751497Ab2GPJDZ (ORCPT ); Mon, 16 Jul 2012 05:03:25 -0400 Message-ID: <5003D93E.2000304@redhat.com> Date: Mon, 16 Jul 2012 17:05:02 +0800 From: Asias He User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1 MIME-Version: 1.0 To: Christoph Hellwig CC: linux-kernel@vger.kernel.org, Alexander Viro , Benjamin LaHaise , James Bottomley , Jeff Moyer , kvm@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org, "Michael S. Tsirkin" , virtualization@lists.linux-foundation.org, Dave Kleikamp , Zach Brown Subject: Re: [PATCH RESEND 0/5] Add vhost-blk support References: <1342169711-12386-1-git-send-email-asias@redhat.com> <20120714074911.GA31684@infradead.org> In-Reply-To: <20120714074911.GA31684@infradead.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Christoph, On 07/14/2012 03:49 PM, Christoph Hellwig wrote: > Please send a version that does direct block I/O similar to xen-blkback > for now. Seems xen-blkback converts the guest IO request to host bio and submit them directly. I was wondering whether this has a performance gain compared to AIO implementation. > If we get proper in-kernel aio support one day you can add > back file backend support. I talked with Dave and Zack on the in-kernel aio patch which James pointed out: http://marc.info/?l=linux-fsdevel&m=133312234313122 Dave will post a new version soon. I will wait for it. -- Asias