Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753917AbYJNTLT (ORCPT ); Tue, 14 Oct 2008 15:11:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751702AbYJNTLF (ORCPT ); Tue, 14 Oct 2008 15:11:05 -0400 Received: from 1-1-4-20a.ras.sth.bostream.se ([82.182.72.90]:57470 "EHLO amd.kenjo.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751626AbYJNTLE (ORCPT ); Tue, 14 Oct 2008 15:11:04 -0400 Subject: Re: weird throughput on write to SATA disk From: kenneth johansson To: Tejun Heo Cc: Grant Grundler , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <48F463C4.3070405@kernel.org> References: <1223925629.3947.7.camel@duo> <1223932956.3947.22.camel@duo> <1223936351.3947.41.camel@duo> <1223975694.3947.77.camel@duo> <48F463C4.3070405@kernel.org> Content-Type: multipart/mixed; boundary="=-uwCB5yqFNjj/kyp2+U+X" Date: Tue, 14 Oct 2008 21:10:49 +0200 Message-Id: <1224011449.10090.7.camel@duo> Mime-Version: 1.0 X-Mailer: Evolution 2.24.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 14111 Lines: 214 --=-uwCB5yqFNjj/kyp2+U+X Content-Type: text/plain Content-Transfer-Encoding: 7bit On Tue, 2008-10-14 at 18:17 +0900, Tejun Heo wrote: > kenneth johansson wrote: > > On Mon, 2008-10-13 at 18:33 -0700, Grant Grundler wrote: > >> On Mon, Oct 13, 2008 at 3:19 PM, kenneth johansson wrote: > >> ... > >>>> Can you try "dd oflag=direct if=/dev/null of=/dev/sdb bs=64k"? > >>> I changed to use O_DIRECT and it's much more consistent now. 69-75 with > >>> 74 about 95% of the time. > >> That's low but it could be worse. Many things can contribute to slow > >> disks. > > Well my main problem was that it was fluctuating so much that can't be > > right. > Can you try deadline scheduler? > I did but it was so bad I restarted my computer and did it again. Same result complete disaster. so fas O_DIRECT is the only one that is as it should be. Alan mentioned a patch by Arjan van de Ven anyone knows how to find that one? --=-uwCB5yqFNjj/kyp2+U+X Content-Disposition: attachment; filename="deadline2.png" Content-Type: image/png; name="deadline2.png" Content-Transfer-Encoding: base64 iVBORw0KGgoAAAANSUhEUgAAAoAAAAHgCAMAAAACDyzWAAAB6VBMVEX///8AAACgoKD/AAAAwAAA gP/AAP8A7u7AQADu7gAgIMD/wCAAgECggP+AQAD/gP8AwGAAwMAAYIDAYIAAgABA/4AwYICAYABA QEBAgAAAAICAYBCAYGCAYIAAAMAAAP8AYADjsMBAwIBgoMBgwABgwKCAAACAAIBgIIBgYGAgICAg QEAgQIBggCBggGBggICAgEAggCCAgICgoKCg0ODAICAAgIDAYACAwODAYMDAgADAgGD/QAD/QECA wP//gGD/gIDAoADAwMDA/8D/AAD/AP//gKDAwKD/YGAA/wD/gAD/oACA4OCg4OCg/yDAAADAAMCg ICCgIP+AIACAICCAQCCAQICAYMCAYP+AgADAwAD/gED/oED/oGD/oHD/wMD//wD//4D//8AAAIAA AJAAAKAAALAAAMAAANAAAOEAAPEAAv8AEv8AIv8AM/8AQ/8AU/8AY/8Ac/8AhP8AlP8ApP8AtP8A xP8A1P8A5f8A9f8G//kW/+km/9k3/8hH/7hX/6hn/5h3/4iI/3eY/2eo/1e4/0fI/zfZ/ybp/xb5 /wb/9QD/5QD/1AD/xAD/tAD/pAD/lAD/hAD/cwD/YwD/UwD/QwD/MwD/IgD/EgD/AgDxAADhAADQ 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