From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Sat, 23 Dec 2006 07:36:17 -0800 (PST) Received: from deflector.emaze.net (deflector.emaze.net [213.178.220.4]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id kBNFaCqw010754 for ; Sat, 23 Dec 2006 07:36:13 -0800 Received: from localhost (localhost [127.0.0.1]) by deflector.emaze.net (Postfix) with ESMTP id 8F6E7F2816D for ; Sat, 23 Dec 2006 16:15:12 +0100 (CET) Received: from deflector.emaze.net ([127.0.0.1]) by localhost (deflector [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 06830-03 for ; Sat, 23 Dec 2006 16:15:12 +0100 (CET) Received: from [192.168.10.55] (host68-236-dynamic.5-87-r.retail.telecomitalia.it [87.5.236.68]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by deflector.emaze.net (Postfix) with ESMTP id 459C2F28080 for ; Sat, 23 Dec 2006 16:15:12 +0100 (CET) Message-ID: <458D4845.2010803@emaze.net> Date: Sat, 23 Dec 2006 16:16:21 +0100 From: fdegrassi MIME-Version: 1.0 Subject: Possible performance problem introduced between kernel 2.6.15 and 2.6.17 on xfs code Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com List-Id: xfs To: linux-xfs@oss.sgi.com Hi all, i noticed that changing from kernel 2.6.15 to 2.6.17, gnomevfs-copy operations suffered an heavy performance hit (20 times slower). I checked quickly (i am not a kernel hacker) and i think it could be related to libgnomevfs calling fadvice POSIX_FADV_DONTNEED (in gnome_vfs_forget_cache, disabling this behaviour gets back normal performance). I am not able to dig deeper than this, anyway it could be a starting point. The relevant gnome bugzilla reference is the following: http://bugzilla.gnome.org/show_bug.cgi?id=363400 Francesco Degrassi