Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752826AbZIYOqd (ORCPT ); Fri, 25 Sep 2009 10:46:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752669AbZIYOqd (ORCPT ); Fri, 25 Sep 2009 10:46:33 -0400 Received: from james.oetiker.ch ([213.144.138.195]:39422 "EHLO james.oetiker.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752422AbZIYOqc (ORCPT ); Fri, 25 Sep 2009 10:46:32 -0400 Date: Fri, 25 Sep 2009 16:46:34 +0200 (CEST) From: Tobias Oetiker To: Corrado Zoccolo cc: Shan Wei , Jens Axboe , Jeff Moyer , linux-kernel@vger.kernel.org Subject: Re: [Fwd: [RFC] cfq: adapt slice to number of processes doing I/O (v2.1)] In-Reply-To: <4e5e476b0909250105m18983420g20e39cb2b124af04@mail.gmail.com> Message-ID: References: <4AB74629.1030109@cn.fujitsu.com> <4ABB3A0E.2090204@cn.fujitsu.com> <4e5e476b0909250105m18983420g20e39cb2b124af04@mail.gmail.com> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1089 Lines: 32 Hi Corrado, > > Have you tested buffered write, multi-threads? > Yes. One interesting test was done by Tobias Oetiker > (http://oss.oetiker.ch/optools/wiki/fsopbench) on his Areca HW Raid6 > with ext3. He put target_latency to 200ms, and used a lower > slice_idle, to match his faster disks. I have since updated my benchmark program: http://oss.oetiker.ch/optools/wiki/FsOpBench it provides an even better competition model. It now works on a 20GB artificial file tree with a home directory like file distribution. Results are quite striking ... (not necessarily encouraging). results are quite amazing ... I am still collecting ... but maybe some of you want to try this too ... cheers tobi -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch tobi@oetiker.ch ++41 62 775 9902 / sb: -9900 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/