From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ondrej Zary Subject: Re: [git patches] IDE update Date: Tue, 05 Jul 2005 12:01:40 +0200 Message-ID: <42CA5A84.1060005@rainbow-software.org> References: <200507042033.XAA19724@raad.intranet> <42C9C56D.7040701@tomt.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mailhub3.nextra.sk ([195.168.1.146]:39687 "EHLO mailhub3.nextra.sk") by vger.kernel.org with ESMTP id S261779AbVGEKBt (ORCPT ); Tue, 5 Jul 2005 06:01:49 -0400 In-Reply-To: <42C9C56D.7040701@tomt.net> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: =?ISO-8859-1?Q?Andr=E9_Tomt?= Cc: Al Boldi , 'Bartlomiej Zolnierkiewicz' , 'Linus Torvalds' , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Andr=E9 Tomt wrote: > Al Boldi wrote: >=20 >> Bartlomiej Zolnierkiewicz wrote: { >> >>>>> On 7/4/05, Al Boldi wrote: >>>>> Hdparm -tT gives 38mb/s in 2.4.31 >>>>> Cat /dev/hda > /dev/null gives 2% user 33% sys 65% idle >>>>> >>>>> Hdparm -tT gives 28mb/s in 2.6.12 >>>>> Cat /dev/hda > /dev/null gives 2% user 25% sys 0% idle 73% IOWAIT >=20 >=20 > The "hdparm doesn't get as high scores as in 2.4" is a old discussed = to=20 > death "problem" on LKML. So far nobody has been able to show it affec= ts=20 > anything but that pretty useless quasi-benchmark. >=20 No, it's not a problem with hdparm. hdparm only shows that there is=20 _really_ a problem: 2.6.12 root@pentium:/home/rainbow# time dd if=3D/dev/hda of=3D/dev/null bs=3D5= 12 count=3D1048576 1048576+0 records in 1048576+0 records out real 0m32.339s user 0m1.500s sys 0m14.560s 2.4.26 root@pentium:/home/rainbow# time dd if=3D/dev/hda of=3D/dev/null bs=3D5= 12 count=3D1048576 1048576+0 records in 1048576+0 records out real 0m23.858s user 0m1.750s sys 0m15.180s --=20 Ondrej Zary