From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933087AbXKPSf6 (ORCPT ); Fri, 16 Nov 2007 13:35:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759480AbXKPSfb (ORCPT ); Fri, 16 Nov 2007 13:35:31 -0500 Received: from nf-out-0910.google.com ([64.233.182.189]:18431 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759732AbXKPSf2 (ORCPT ); Fri, 16 Nov 2007 13:35:28 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=f4TZ+KWLApPJKtS7yAI9l8hTLZrauuElRKqURCEZm9h/CBcaKvuRlBuoLJM64mEENWKhQhySV7rApAPJzgsXmN43ZfytVKpw2JQfIGOQHAhnGClIjLQN/dzeS3p+onuVbCRZRbjnv/f0+TndZAJ2Caeb6yw95TxnXkvPJ3ZiohA= Message-ID: <2c0942db0711161035x5978a37bjd0f3fb67470553eb@mail.gmail.com> Date: Fri, 16 Nov 2007 10:35:25 -0800 From: "Ray Lee" To: "Alan D. Brunelle" Subject: Re: [patch] Give kjournald a IOPRIO_CLASS_RT io priority Cc: "Andrew Morton" , "Rik van Riel" , arjan@infradead.org, jens.axboe@oracle.com, mingo@elte.hu, linux-kernel@vger.kernel.org In-Reply-To: <473DC496.6010805@hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20071015104647.14e60bc5@laptopd505.fenrus.org> <20071015114738.6b5a25c7.akpm@linux-foundation.org> <20071015161315.4fe18e07@bree.surriel.com> <20071015141236.62b075c6.akpm@linux-foundation.org> <473B18BA.5000709@hp.com> <20071114091451.d4b110db.akpm@linux-foundation.org> <473DC496.6010805@hp.com> X-Google-Sender-Auth: dadd8aa222ea8dee Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Nov 16, 2007 8:25 AM, Alan D. Brunelle wrote: > Here are the results for the latest tests, some notes: > > o The machine actually has 8GiB of RAM, so the tests still may end up > using (some) page cache. (But at least it was the same for both kernels! > :-) ) > > o Sorry the results took so long - the updated tree size caused the > runs to take > 12 hours... > > o The longer runs seemed to bring down the standard deviation a bit, > although they are still quite large. > > o 10 runs per test (read large file, read a tree, overwrite large > file), with averages presented. > > o 1st 4 columns (min, avg, max, std dev) refer to the average run > lengths for the tests - real time, in seconds > > o The last 3 columns are extracted from iostat results over the course > of the whole run. > > o The read a tree test certainly stands out - the other 2 large file > manipulations have the two kernels within a couple of percent, but the > read a tree test has Arjan's patch taking about 47%(!) longer on > average. The increased %iowait & %system time in all 3 cases is interesting. > > > Read large file: > > Kernel Min Avg Max Std Dev %user %system %iowait > -------------------------------------------------------------- > base : 201.6 215.1 275.5 22.8 0.26% 4.69% 33.54% > arjan: 198.0 210.3 261.5 18.5 0.33% 10.24% 54.00% > > Read a tree: > > Kernel Min Avg Max Std Dev %user %system %iowait > -------------------------------------------------------------- > base : 3518.2 4631.3 5991.3 784.6 0.19% 3.29% 23.56% > arjan: 5731.6 6849.8 7777.4 731.6 0.32% 9.90% 52.70% > > Overwrite large file: > > Kernel Min Avg Max Std Dev %user %system %iowait > -------------------------------------------------------------- > base : 104.2 147.7 239.5 38.4 0.02% 0.05% 1.08% > arjan: 106.2 149.7 239.2 38.4 0.25% 0.79% 14.97% > > Let me know if there is anything else I can do to elaborate, or if you > have suggestions for further testing. Out of curiosity, what are the mount options for the freshly created ext3 fs? In particular, are you using noatime, nodiratime? Ray