From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ryan Harper Subject: Re: [Qemu-devel] Re: [PATCH 0/3] Refactor AIO to allow multiple AIO implementations Date: Tue, 23 Sep 2008 09:43:19 -0500 Message-ID: <20080923144319.GM31395@us.ibm.com> References: <1222125454-21744-1-git-send-email-ryanh@us.ibm.com> <48D86361.4000405@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Ryan Harper , qemu-devel@nongnu.org, kvm@vger.kernel.org To: Anthony Liguori Return-path: Received: from e33.co.us.ibm.com ([32.97.110.151]:50774 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752074AbYIWOnW (ORCPT ); Tue, 23 Sep 2008 10:43:22 -0400 Received: from d03relay02.boulder.ibm.com (d03relay02.boulder.ibm.com [9.17.195.227]) by e33.co.us.ibm.com (8.13.8/8.13.8) with ESMTP id m8NEhLEW007242 for ; Tue, 23 Sep 2008 10:43:21 -0400 Received: from d03av01.boulder.ibm.com (d03av01.boulder.ibm.com [9.17.195.167]) by d03relay02.boulder.ibm.com (8.13.8/8.13.8/NCO v9.1) with ESMTP id m8NEhKaX182028 for ; Tue, 23 Sep 2008 08:43:20 -0600 Received: from d03av01.boulder.ibm.com (loopback [127.0.0.1]) by d03av01.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m8NEhJno016109 for ; Tue, 23 Sep 2008 08:43:19 -0600 Content-Disposition: inline In-Reply-To: <48D86361.4000405@us.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: * Anthony Liguori [2008-09-22 22:44]: > Can you run the same performance tests with the following patches (using > sync=on instead of cache=off)? > > You'll need my aio_init fix too. I suspect this will give equally good > performance to your patch set. That's not saying your patch set isn't > useful, but I would like to get performance to be better for the case > that we're going through the page cache. I can run the test, but it is orthogonal to the patchset which is focused on using O_DIRECT and linux-aio. -- Ryan Harper Software Engineer; Linux Technology Center IBM Corp., Austin, Tx (512) 838-9253 T/L: 678-9253 ryanh@us.ibm.com