Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752927AbaFKUpX (ORCPT ); Wed, 11 Jun 2014 16:45:23 -0400 Received: from smtp7.sms.unimo.it ([155.185.44.150]:43219 "EHLO smtp7.sms.unimo.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751797AbaFKUpU convert rfc822-to-8bit (ORCPT ); Wed, 11 Jun 2014 16:45:20 -0400 Subject: Re: BFQ speed tests [was Re: [PATCH RFC - TAKE TWO - 00/12] New version of the BFQ I/O Scheduler] Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.2\)) Content-Type: text/plain; charset=windows-1252 From: Paolo Valente In-Reply-To: Date: Wed, 11 Jun 2014 22:45:06 +0200 Cc: Pavel Machek , Tejun Heo , Jens Axboe , Li Zefan , Fabio Checconi , Arianna Avanzini , linux-kernel@vger.kernel.org, containers@lists.linux-foundation.org, cgroups@vger.kernel.org Content-Transfer-Encoding: 8BIT Message-Id: <6A4905B2-ACAA-419D-9C83-659BE9A5B20B@unimore.it> References: <20140528221929.GG1419@htj.dyndns.org> <1401354343-5527-1-git-send-email-paolo.valente@unimore.it> <20140530160712.GG24871@htj.dyndns.org> <464F6CBE-A63E-46EF-A90D-BF8450430444@unimore.it> <20140530232804.GA5057@htj.dyndns.org> <20140602111432.GA3737@amd.pavel.ucw.cz> <20140602130226.GA14654@amd.pavel.ucw.cz> <20140604100358.GA4799@amd.pavel.ucw.cz> <4888F93F-D58D-48DD-81A6-A6D61C452D92@unimore.it> To: Takashi Iwai X-Mailer: Apple Mail (2.1878.2) UNIMORE-X-SA-Score: -2.9 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Il giorno 04/giu/2014, alle ore 13:59, Takashi Iwai ha scritto: > [?] > I've been using BFQ for a while and noticed also some obvious > regression in some operations, notably git, too. > For example, git grep regresses badly. > > I ran "test git grep foo > /dev/null" on linux kernel repos on both > rotational disk and SSD. > [?] > > BFQ seems behaving bad when reading many small files. > The fix I described in my last reply to Pavel's speed tests (https://lkml.org/lkml/2014/6/4/94) apparently solves also this problem. As I wrote in that reply, the new fixed version of bfq is here: http://algogroup.unimore.it/people/paolo/disk_sched/debugging-patches/3.16.0-rc0-v7rc5.tgz These are our results, for your test, with this fixed version of bfq. time git grep foo > /dev/null Rotational disk: CFQ: 2.86user 4.87system 0:29.51elapsed 26%CPU 2.87user 4.87system 0:30.30elapsed 25%CPU 2.82user 4.90system 0:29.13elapsed 26%CPU BFQ: 2.81user 4.97system 0:25.96elapsed 29%CPU 2.83user 5.02system 0:24.79elapsed 31%CPU 2.85user 4.95system 0:24.73elapsed 31%CPU SSD: CFQ: 2.04user 3.93system 0:03.88elapsed 153%CPU 2.12user 3.85system 0:03.89elapsed 153%CPU 2.05user 3.92system 0:03.89elapsed 153%CPU BFQ: 2.10user 3.86system 0:03.89elapsed 153%CPU 2.05user 3.90system 0:03.88elapsed 153%CPU 2.01user 3.95system 0:03.89elapsed 153%CPU time git grep foo HEAD > /dev/null SSD: CFQ: 5.11user 0.38system 0:06.71elapsed 81%CPU 5.21user 0.36system 0:06.78elapsed 82%CPU 5.05user 0.41system 0:06.69elapsed 81%CPU BFQ: 5.17user 0.39system 0:06.77elapsed 82%CPU 5.13user 0.37system 0:06.73elapsed 81%CPU 5.17user 0.37system 0:06.78elapsed 81%CPU Should you be willing to provide further feedback on this and other tests, we would of course really appreciate it. Thanks again for your report, Paolo-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/