From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Wed, 04 Apr 2007 06:47:38 -0700 (PDT) Received: from mail3b1.westend.com (mail3b.westend.com [212.117.79.78]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id l34DlTfB027541 for ; Wed, 4 Apr 2007 06:47:31 -0700 Date: Wed, 4 Apr 2007 15:47:24 +0200 From: Thomas Kaehn Subject: Re: Strange delete performance using XFS Message-ID: <20070404134724.GF18320@mail3b.westend.com> References: <20070404130535.GE18320@mail3b.westend.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: Justin Piszcz Cc: xfs@oss.sgi.com Hi Justin, On Wed, Apr 04, 2007 at 09:29:46AM -0400, Justin Piszcz wrote: > >Please see below for "time" output. > > > >| # time for i in `seq 1 100000`; do dd if=/dev/zero of=$i bs=1k count=20 > >>/dev/null 2>&1; done > >| > >| real 6m6.814s > >| user 0m30.290s > >| sys 2m42.562s > >| # time rm -rf y > >| > >| real 5m18.034s > >| user 0m0.036s > >| sys 0m8.169s > Deletes on XFS is one area that is a little slower than other filesystems. > You can increase the log size during the creation of the filesystem and > also increase logbufs to 8 and that might help. Thanks for your suggestions. I also tried to increase the log size and logbufs mount option. This optimizes create and delete times to the above values (with default options both are around 9-10 minutes). The strange thing is that on a similar Dell machines using XFS, too, deletes take only ten seconds which would match user and system time. More than five minutes for deleting 100000 files where ext3 needs 3 seconds on the same machine is actually more than a little bit slower - to my mind there must be something wrong. JFS needs around 18 seconds. However I am not sure if the problem is hardware or software related. I've also tried to use the newest 3ware firmware - but this did not lead to an improvement. Ciao, Thomas -- Thomas Kähn WESTEND GmbH | Internet-Business-Provider Technik CISCO Systems Partner - Authorized Reseller Im Süsterfeld 6 Tel 0241/701333-18 tk@westend.com D-52072 Aachen Fax 0241/911879 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Die Gesellschaft ist eingetragen im Handelsregister Aachen unter HRB 7608 Geschäftsführer: Thomas Neugebauer, Thomas Heller, Michael Kolb