From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261728AbUKUCNS (ORCPT ); Sat, 20 Nov 2004 21:13:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261745AbUKUCNS (ORCPT ); Sat, 20 Nov 2004 21:13:18 -0500 Received: from dp.samba.org ([66.70.73.150]:14515 "EHLO lists.samba.org") by vger.kernel.org with ESMTP id S261728AbUKUCNO (ORCPT ); Sat, 20 Nov 2004 21:13:14 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16799.63876.623759.664933@samba.org> Date: Sun, 21 Nov 2004 13:12:20 +1100 To: Andrew Morton Cc: reiser@namesys.com, linux-kernel@vger.kernel.org Subject: Re: performance of filesystem xattrs with Samba4 In-Reply-To: <20041119162651.2d62a6a8.akpm@osdl.org> References: <16797.41728.984065.479474@samba.org> <419E1297.4080400@namesys.com> <16798.31565.306237.930372@samba.org> <20041119162651.2d62a6a8.akpm@osdl.org> X-Mailer: VM 7.19 under Emacs 21.3.1 Reply-To: tridge@samba.org From: tridge@samba.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrew, > Is it reproducible with your tricked-up dbench? > > If so, please send me a machine description and the relevant command line > and I'll do a bsearch. I should explain a little more .... The current dbench is showing way too much variance on this test to be really useful. Here are the numbers for 5 runs of dbench 10 on 2.6.10-rc2 and 2.6.10-rc2-mm2: 2.6.10-rc2 325 320 364 360 347 -mm2 347 371 411 322 384 I've solved this variance problem in NBENCH by making the runs fixed time rather than fixed number of operations, and adding a warmup phase. I need to do the same to dbench in order to get sane numbers out that would be at all useful for a binary patch search. The current dbench worked OK when computers were slower, but now it is completing its runs so fast that the noise is just silly. Cheers, Tridge