From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261198AbULHMsA (ORCPT ); Wed, 8 Dec 2004 07:48:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261199AbULHMsA (ORCPT ); Wed, 8 Dec 2004 07:48:00 -0500 Received: from ns.virtualhost.dk ([195.184.98.160]:16594 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id S261198AbULHMr6 (ORCPT ); Wed, 8 Dec 2004 07:47:58 -0500 Date: Wed, 8 Dec 2004 13:47:01 +0100 From: Jens Axboe To: Nick Piggin Cc: Andrew Morton , Andrea Arcangeli , linux-kernel@vger.kernel.org Subject: Re: Time sliced CFQ io scheduler Message-ID: <20041208124701.GS19522@suse.de> References: <20041208003736.GD16322@dualathlon.random> <1102467253.8095.10.camel@npiggin-nld.site> <20041208013732.GF16322@dualathlon.random> <20041207180033.6699425b.akpm@osdl.org> <20041208065534.GF3035@suse.de> <1102489719.8095.56.camel@npiggin-nld.site> <20041208071141.GB19522@suse.de> <1102490389.8095.69.camel@npiggin-nld.site> <20041208072616.GD19522@suse.de> <20041208093552.GK19522@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20041208093552.GK19522@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 08 2004, Jens Axboe wrote: > On Wed, Dec 08 2004, Jens Axboe wrote: > > > Hmm, damn. Lots of stuff. I guess some of the notable ones that I've > > > had trouble with are OraSim (Oracle might give you a copy), Andrew's > > > patch scripts when applying a stack of patches, pgbench... can't > > > really remember any others off the top of my head. > > > > The patch scripts case is interesting, last night (when committing other > > patches) I was thinking I should try and bench that today. It has a good > > mix of reads and writes. > > AS is currently 10 seconds faster for that workload (untar of a kernel > and then applying 2237 patches). AS completes it in 155 seconds, CFQ > takes 164 seconds. Turned out to be a stupid dispatch sort error in cfq, now it has the exact same runtime as AS. -- Jens Axboe