Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750758AbVIJLwX (ORCPT ); Sat, 10 Sep 2005 07:52:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750760AbVIJLwX (ORCPT ); Sat, 10 Sep 2005 07:52:23 -0400 Received: from ppp59-167.lns1.cbr1.internode.on.net ([59.167.59.167]:3591 "EHLO triton.bird.org") by vger.kernel.org with ESMTP id S1750758AbVIJLwX (ORCPT ); Sat, 10 Sep 2005 07:52:23 -0400 Message-ID: <4322C9DF.1090704@acquerra.com.au> Date: Sat, 10 Sep 2005 21:56:15 +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: Andrew Morton CC: nate.diller@gmail.com, 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> <4322B437.3010309@acquerra.com.au> <20050910044240.4e8e8e03.akpm@osdl.org> In-Reply-To: <20050910044240.4e8e8e03.akpm@osdl.org> 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: 1489 Lines: 45 Andrew Morton wrote: > Anthony Wesley wrote: > >>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. > > > ext2 is a good filesystem. For that sort of application all the journaling > gunk can really get in the way. > > You should have tested ext3 with data=writeback. > Ask and ye shall receive... I created an ext3 fs, mounted it with data=writeback and gave it a quick spin. The result? Lots of pauses and dropped frames during capture. This is during the part of the process where I have gobs of free RAM that's being used for buffering so dropping frames here is a cardinal sin. Dunno why it's happening, but I saw it also with xfs and reiser4. ext2 on the other hand chugs along happily, no pauses, no dropped frames until we run out of free RAM (takes about 2 minutes now after the simple kernel change). I can understand dropped frames after we run out of ram, but not before. 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/