From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263052AbUB0REY (ORCPT ); Fri, 27 Feb 2004 12:04:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263053AbUB0REY (ORCPT ); Fri, 27 Feb 2004 12:04:24 -0500 Received: from fw.osdl.org ([65.172.181.6]:12685 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S263052AbUB0RES (ORCPT ); Fri, 27 Feb 2004 12:04:18 -0500 Message-Id: <200402271704.i1RH45E19258@mail.osdl.org> Date: Fri, 27 Feb 2004 09:03:58 -0800 (PST) From: markw@osdl.org Subject: Re: AS performance with reiser4 on 2.6.3 To: reiser@namesys.com cc: Nikita@namesys.com, piggin@cyberone.com.au, reiserfs-list@namesys.com, linux-kernel@vger.kernel.org In-Reply-To: <403EBB87.2070504@namesys.com> MIME-Version: 1.0 Content-Type: TEXT/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 27 Feb, Hans Reiser wrote: > Nikita Danilov wrote: > >>markw@osdl.org writes: >> > Hi Nick, >> > >> > I started getting some results with dbt-2 on 2.6.3 and saw that reiser4 >> > is doing a bit worse with the AS elevator. Although reiser4 wasn't >> > doing well to begin with, compared to the other filesystems. I have >> > links to the STP results on our 4-ways and 8-ways here: >> > http://developer.osdl.org/markw/fs/dbt2_stp_results.html >> >>There were no changes between 2.6.2 and 2.6.3 that could affect reiser4 >>performance, so it is not clear why numbers are so different. Probably >>results should be averaged over several runs. >> > The differences don't "feel" like testing error, and in any event > something is seriously wrong. That something is either poor fsync > performance, or poor scalability. In any event, please investigate, and > please try such things as using capture on copy. Mark, does this > benchmark like to use fsync? > > Thanks much mark for bringing this to our attention. Yes, PostgreSQL uses fsync for its database logging. I can certainly enable the capture on copy option. Does that produce something that I need to manually capture? Mark