From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264389AbTL3Xre (ORCPT ); Tue, 30 Dec 2003 18:47:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264392AbTL3Xre (ORCPT ); Tue, 30 Dec 2003 18:47:34 -0500 Received: from mail4.bluewin.ch ([195.186.4.74]:2509 "EHLO mail4.bluewin.ch") by vger.kernel.org with ESMTP id S264389AbTL3Xrd (ORCPT ); Tue, 30 Dec 2003 18:47:33 -0500 Date: Wed, 31 Dec 2003 00:46:43 +0100 From: Roger Luethi To: Thomas Molina Cc: William Lee Irwin III , Linus Torvalds , Kernel Mailing List Subject: Re: 2.6.0 performance problems Message-ID: <20031230234643.GB8412@k3.hellgate.ch> Mail-Followup-To: Thomas Molina , William Lee Irwin III , Linus Torvalds , Kernel Mailing List References: <20031230143929.GN27687@holomorphy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Operating-System: Linux 2.6.0-test11 on i686 X-GPG-Fingerprint: 92 F4 DC 20 57 46 7B 95 24 4E 9E E7 5A 54 DC 1B X-GPG: 1024/80E744BD wwwkeys.ch.pgp.net User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 30 Dec 2003 16:14:13 -0500, Thomas Molina wrote: > I also get 90+ percent iowait under 2.6 and 0 iowait in 2.4. I'm not sure > how the alleged suckiness of 2.6 paging fits into this. On this system It is not alleged. It is real, but the badness is not universal. I was afraid I'd have to add another category, but fortunately it seems bk export matches qsbench: Major regressions neither between test2 and test3 nor between 2.4 and 2.6. I'm still interested to learn whether 2.5.39 is a major regression (fixed later) for bk export, although that might have been due to the qs specific reference patterns, I haven't looked into it. At least for qsbench the spike is confirmed though, even with different parameters. Roger