From: Theodore Tso Subject: Re: Large File Deletion Comparison (ext3, ext4, XFS) Date: Fri, 27 Apr 2007 14:33:46 -0400 Message-ID: <20070427183345.GJ24852@thunk.org> References: <4631FD7F.9030008@bull.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: ext4 development To: Valerie Clement Return-path: Received: from thunk.org ([69.25.196.29]:42864 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757004AbXD0Sdt (ORCPT ); Fri, 27 Apr 2007 14:33:49 -0400 Content-Disposition: inline In-Reply-To: <4631FD7F.9030008@bull.net> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Fri, Apr 27, 2007 at 03:41:19PM +0200, Valerie Clement wrote: > As asked by Alex, I included in the test results the file fragmentation > level and the number of I/Os done during the file deletion. > > Here are the results obtained with a not very fragmented 100-GB file: > > | ext3 ext4 + extents xfs > ------------------------------------------------------------ > nb of fragments | 796 798 15 > elapsed time | 2m0.306s 0m11.127s 0m0.553s > | > blks read | 206600 6416 352 > blks written | 13592 13064 104 > ------------------------------------------------------------ The metablockgroups feature should help the file fragmentation level with extents. It's easy enough to enable this for ext4 (we just need to remove some checks in ext4_check_descriptors), so we should just do it. - Ted