From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752362AbaEWNOs (ORCPT ); Fri, 23 May 2014 09:14:48 -0400 Received: from mail-pb0-f43.google.com ([209.85.160.43]:51235 "EHLO mail-pb0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751113AbaEWNOq (ORCPT ); Fri, 23 May 2014 09:14:46 -0400 Message-ID: <537F49C2.3000304@gmail.com> Date: Fri, 23 May 2014 22:14:42 +0900 From: Akira Hayakawa User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: dm-devel@redhat.com CC: linux-kernel@vger.kernel.org, masami.hiramatsu@gmail.com, devel@etsukata.com Subject: Re: dm-writeboost: Progress Report References: <537775B0.2060907@gmail.com> In-Reply-To: <537775B0.2060907@gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Guys, This progress report includes very important benchmarking results, which shows i) Write will always improve - It boosts writes (396% in the best case) even with really small cache (say, 64MB) because of the sophisticated writeback optimization. ii) Read won't be bad - It doesn't so much deteriorate the read (less than 1% for SSD+HDD case) because of the insignificant overhead. iii) Good in application workloads - 22% improvement with read-intensive workload and 234-299% improvement with fileserver workload (using dbench) Yeah, merging Writeboost into the mainline is my goal now and I really need your feedbacks. For more details, please read the previous post. Cheers, - Akira