Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750739AbVIJKUN (ORCPT ); Sat, 10 Sep 2005 06:20:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750742AbVIJKUN (ORCPT ); Sat, 10 Sep 2005 06:20:13 -0400 Received: from ppp59-167.lns1.cbr1.internode.on.net ([59.167.59.167]:63238 "EHLO triton.bird.org") by vger.kernel.org with ESMTP id S1750739AbVIJKUL (ORCPT ); Sat, 10 Sep 2005 06:20:11 -0400 Message-ID: <4322B437.3010309@acquerra.com.au> Date: Sat, 10 Sep 2005 20:23:51 +1000 From: Anthony Wesley Reply-To: awesley@acquerra.com.au User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.8) Gecko/20050511 X-Accept-Language: en-us, en MIME-Version: 1.0 To: nate.diller@gmail.com CC: linux-kernel@vger.kernel.org Subject: Re: kernel 2.6.13 buffer strangeness - ext2/3/reiser4/xfs comparison References: <432151B0.7030603@acquerra.com.au> <5c49b0ed05090914394dba42bf@mail.gmail.com> <432225E0.9030606@acquerra.com.au> <5c49b0ed0509091735436260bb@mail.gmail.com> <432231B7.2060200@acquerra.com.au> <5c49b0ed0509091847135834c0@mail.gmail.com> <432243AA.4000508@acquerra.com.au> <5c49b0ed05090922021b8f8112@mail.gmail.com> In-Reply-To: <5c49b0ed05090922021b8f8112@mail.gmail.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1756 Lines: 43 Nate Diller wrote: > i really recommend you focus on getting better disk bandwidth, you stand > to gain a lot more from that approach. i presume you're on ext3; > perhaps you should try reiser4 or xfs, they are more likely to meet your > disk bandwidth requirements. > > NATE While I have already solved the issue that was troubling me, I also spent some time comparing different filesystems as reccommended by Nate, with interesting results. My method was simple - make a filesystem and the set it as the target for my video capture. With video coming in at 25MBytes/sec and going out to disk at about 15-20MBytes/sec it is an interesting test of the vm and filesystem. I compared ext2,ext3,xfs,vfat,reiser and reiser4. The hands-down winner was ext2. All the others showed problems of either lower disk throughput or dropped frames during video capture. Only ext2 went the full distance - no dropped frames until we run out of RAM, and good disk throughput. xfs,reiser and reiser4 had slightly higher disk write speed, but showed performance problems that caused lots of dropped frames so they must be ruled out at this stage. I know that xfs and reiser4 are supposed to be faster for some things, but it seems to me that they are not the best choice when you are predominantly writing lots and lots of 600k files :-) regards, Anthony -- Anthony Wesley Director and IT/Network Consultant Smart Networks Pty Ltd Acquerra Pty Ltd Anthony.Wesley@acquerra.com.au Phone: (02) 62595404 or 0419409836 - 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/