From: Ric Wheeler Subject: Re: [PATCH 2/4] Create the journal in the middle of the filesystem Date: Thu, 28 Aug 2008 10:38:39 -0400 Message-ID: <48B6B86F.5060106@redhat.com> References: <20080827210636.GC26987@mit.edu> <1219871676-18456-1-git-send-email-tytso@mit.edu> <1219871676-18456-2-git-send-email-tytso@mit.edu> <1219917321.3591.79.camel@frecb007923.frec.bull.fr> <20080828133449.GG26987@mit.edu> <48B6AACE.6060103@redhat.com> <20080828143648.GJ26987@mit.edu> Reply-To: rwheeler@redhat.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: =?ISO-8859-1?Q?Fr=E9d=E9ric_Boh=E9?= , linux-ext4@vger.kernel.org To: Theodore Tso Return-path: Received: from mx2.redhat.com ([66.187.237.31]:46580 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753083AbYH1OlH (ORCPT ); Thu, 28 Aug 2008 10:41:07 -0400 In-Reply-To: <20080828143648.GJ26987@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: Theodore Tso wrote: > On Thu, Aug 28, 2008 at 09:40:30AM -0400, Ric Wheeler wrote: > >> I can try and test this with my fsync() heavy fs_mark run... >> >> > > Given [1] I have no doubt that you should see a difference between > mke2fs from e2fsprogs 1.41.0 (which will allocate the journal at the > beginning of the filesystem) and the latest tip of e2fsprogs. > > It would be interesting to see how measurable the difference is, > though. I'd recommend doing "mke2fs -t ext4dev" using both versions > of mke2fs, and seeing how much the difference it makes. > > [1] http://www.usenix.org/events/usenix05/tech/general/full_papers/prabhakaran/prabhakaran_html/main.html#fig-journal-location-withinfs-fix > > - Ted > > I was thinking of trying this on a much larger disk (1TB) - the article reports on a 4GB partition which is pretty tiny, ric