From: Valerie Clement Subject: Re: Test results for ext4 Date: Fri, 30 May 2008 18:21:16 +0200 Message-ID: <4840297C.7030809@bull.net> References: <48402253.8040407@bull.net> <484024EF.7080304@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: ext4 development To: Eric Sandeen Return-path: Received: from ecfrec.frec.bull.fr ([129.183.4.8]:40981 "EHLO ecfrec.frec.bull.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752263AbYE3QVi (ORCPT ); Fri, 30 May 2008 12:21:38 -0400 In-Reply-To: <484024EF.7080304@redhat.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Eric Sandeen wrote: > Valerie Clement wrote: >> Hi all, >> >> Since a couple of weeks, I did batches of tests to have some perform= ance >> 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 significa= nt >> 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 s= lab >> 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.ht= ml >> http://www.bullopensource.org/ext4/20080530/ffsb-readwrite-2.6.26-rc= 2.html >=20 > To be fair in your comparisons with xfs, you should probably either t= urn > barriers off for xfs, or on for ext[34], just FWIW. >=20 Oops, I did the test on a device mapper /dev/md0. I forgot to change it= in the test description. I will do it. When mounting the xfs filesystem, I've got the following message: Filesystem "md0": Disabling barriers, not supported by the underlying= device It means barriers are not supported by my device, isn' it? Val=E9rie -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html