From: Eric Sandeen Subject: Re: Test results for ext4 Date: Fri, 30 May 2008 11:01:51 -0500 Message-ID: <484024EF.7080304@redhat.com> References: <48402253.8040407@bull.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: ext4 development , Mingming Cao , "Jose R. Santos" To: Valerie Clement Return-path: Received: from mx1.redhat.com ([66.187.233.31]:50938 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752084AbYE3QC5 (ORCPT ); Fri, 30 May 2008 12:02:57 -0400 In-Reply-To: <48402253.8040407@bull.net> Sender: linux-ext4-owner@vger.kernel.org List-ID: Valerie Clement wrote: > Hi all, > > Since a couple of weeks, I did batches of tests to have some performance > numbers for the new ext4 features like uninit_groups, flex_bg or > journal_checksum on a 5TB filesystem. > I tried to test allmost all combinations of mkfs and mount options, but > I put only a subset of them in the result tables, the most significant > for me. > > I had started to do these tests on a kernel 2.6.26-rc1, but I'd got several > hangs and crashes occuring randomly outside ext4, sometimes in the slab > code or in the scsi driver eg., and which were not reproductible. > Since 2.6.26-rc2, no crash or hang occur with ext4 on my system. > > The first results and the test description are available here: > http://www.bullopensource.org/ext4/20080530/ffsb-write-2.6.26-rc2.html > http://www.bullopensource.org/ext4/20080530/ffsb-readwrite-2.6.26-rc2.html To be fair in your comparisons with xfs, you should probably either turn barriers off for xfs, or on for ext[34], just FWIW. -Eric