From: Andreas Dilger Subject: Re: Ext4 without a journal: some benchmark results Date: Thu, 08 Jan 2009 06:03:57 -0700 Message-ID: <20090108130357.GW13721@webber.adilger.int> References: <6601abe90901071129v3de159d4jcf3b250aac40d0eb@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7BIT Cc: linux-ext4@vger.kernel.org To: Curt Wohlgemuth Return-path: Received: from sca-es-mail-2.Sun.COM ([192.18.43.133]:54529 "EHLO sca-es-mail-2.sun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754494AbZAHNEB (ORCPT ); Thu, 8 Jan 2009 08:04:01 -0500 Received: from fe-sfbay-09.sun.com ([192.18.43.129]) by sca-es-mail-2.sun.com (8.13.7+Sun/8.12.9) with ESMTP id n08D40pZ003755 for ; Thu, 8 Jan 2009 05:04:00 -0800 (PST) Received: from conversion-daemon.fe-sfbay-09.sun.com by fe-sfbay-09.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0KD500001LM7N200@fe-sfbay-09.sun.com> (original mail from adilger@sun.com) for linux-ext4@vger.kernel.org; Thu, 08 Jan 2009 05:04:00 -0800 (PST) In-reply-to: <6601abe90901071129v3de159d4jcf3b250aac40d0eb@mail.gmail.com> Content-disposition: inline Sender: linux-ext4-owner@vger.kernel.org List-ID: On Jan 07, 2009 11:29 -0800, Curt Wohlgemuth wrote: > Iozone was run with the following command line: > > iozone -t (# threads) -s 2g -r 256k -I -T -i0 -i1 -i2 > > I.e., throughput mode; 2GiB file; 256KiB buffer; O_DIRECT. Tests were > limited to How much RAM is on the test system? If the file size is only 2GB then it will likely fit into RAM, which is possibly why the performance numbers of all the filesystems is so close together. The other possibility is that a single disk is the performance bottleneck and all of the filesystems can feed a single disk at a reasonable rate. Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc.