From: Theodore Tso Subject: Re: [PATCH 2/4] Create the journal in the middle of the filesystem Date: Thu, 28 Aug 2008 10:36:48 -0400 Message-ID: <20080828143648.GJ26987@mit.edu> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: =?iso-8859-1?Q?Fr=E9d=E9ric_Boh=E9?= , linux-ext4@vger.kernel.org To: Ric Wheeler Return-path: Received: from www.church-of-our-saviour.org ([69.25.196.31]:43900 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752833AbYH1OhN (ORCPT ); Thu, 28 Aug 2008 10:37:13 -0400 Content-Disposition: inline In-Reply-To: <48B6AACE.6060103@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: 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