From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264511AbUAASMj (ORCPT ); Thu, 1 Jan 2004 13:12:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264536AbUAASMj (ORCPT ); Thu, 1 Jan 2004 13:12:39 -0500 Received: from lmdeliver02.st1.spray.net ([212.78.202.115]:33276 "EHLO lmdeliver02.st1.spray.net") by vger.kernel.org with ESMTP id S264511AbUAASMc (ORCPT ); Thu, 1 Jan 2004 13:12:32 -0500 From: Paolo Ornati To: William Lee Irwin III , Ed Sweetman Subject: Re: 2.6.1-rc1 Date: Thu, 1 Jan 2004 19:12:04 +0100 User-Agent: KMail/1.5.2 References: <200312311434.17036.ornati@lycos.it> In-Reply-To: <200312311434.17036.ornati@lycos.it> Cc: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: Multipart/Mixed; boundary="Boundary-00=_0LG9/AAII7glZQK" Message-Id: <200401011912.04358.ornati@lycos.it> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --Boundary-00=_0LG9/AAII7glZQK Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline On Wednesday 31 December 2003 14:34, Paolo Ornati wrote: > > With 2.6.1-rc1 I have noticed a strange IDE performance change. > > Results of "hdparm -t /dev/hda" with 2.6.0 kernel: > (readahead = 256): ~26.31 MB/s > (readahead = 128): ~31.82 MB/s > > PS = readahead is set to 256 by default on my system, 128 seems to be the > best value > > Results of "hdparm -t /dev/hda" with 2.6.1-rc1 kernel: > (readahead = 256): ~26.41 MB/s > (readahead = 128): ~26.27 MB/s > .... I have done new interesting tests. SCRIPT ___________________________________________________________ #!/bin/bash echo "HD test for linux `uname -r`" echo MIN=32 MAX=512 ra=$MIN while test $ra -le $MAX; do hdparm -a $ra /dev/hda > /dev/null; echo -n $ra$'\t'; s1=`hdparm -t /dev/hda | grep 'Timing' | cut -d'=' -f2| cut -d' ' -f2`; s2=`hdparm -t /dev/hda | grep 'Timing' | cut -d'=' -f2| cut -d' ' -f2`; s=`echo "scale=2; ($s1+$s2)/2" | bc`; echo $s; ra=$(($ra+32)); done ___________________________________________________________ o Results for 2.6.0 (first column = readahead, second column = MB/s) HD test for linux 2.6.0 32 13.78 64 31.74 96 31.77 128 31.74 160 31.84 192 31.87 224 31.21 256 26.31 288 21.75 320 27.22 352 27.46 384 31.63 416 28.15 448 28.25 480 31.54 512 26.24 o Results for 2.6.1-rc1 HD test for linux 2.6.1-rc1 32 26.20 64 26.26 96 26.99 128 26.29 160 26.28 192 25.89 224 26.55 256 26.46 288 30.86 320 26.74 352 26.15 384 25.86 416 26.42 448 26.46 480 26.82 512 26.46 A graphic is attached (red = 2.6.0 / green = 2.6.1-rc1 ;) BYE -- Paolo Ornati Linux v2.4.23 --Boundary-00=_0LG9/AAII7glZQK Content-Type: image/png; name="ide-hd.png" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="ide-hd.png" iVBORw0KGgoAAAANSUhEUgAAAg0AAAGMCAYAAABZHJF0AAAABmJLR0QA/wD/AP+gvaeTAAAACXBI WXMAAAsSAAALEgHS3X78AAAAB3RJTUUH1AEBEgYtzIA2oQAAFAtJREFUeJzt3U9u4kq7B+DiKhto D1lOhpGygkTdg7uUu5L+lLMCpAyzHIbuJXAHfZzPIQbeMv5bfh7pqE+M4XUZY35UlWFX18dTAgC4 4X/m3gAAYB2EBgAgRGgAAEKEBgAgRGgAAEKEBgAgRGgAAEIe5t4A2LKq2qe6Pn7+f5fm9vP7XdK1 fle9Ibfn0mPdc/+odp2hHxv4SmiABbkWEM5vm+INMmd7Ivevqv3N4JJjyMcCbjM8AQu3tDfFe7Zn aW0B8uhpgBWo6+OiPlUPvT3XhhiaOufrNH939Xz0fbzz5e37X1p+qR1d23Tt8S89Tp/bYSxCAzCr 8/DRFUa6ll0KLn0f79J9L4WSW3WGXCfnbxiT0AAr1Xei4bVJlGM7rx0NAzmTL+95vGgwifQY9Fnn Uq3c9sFYhAZYqb5vEreunhhS1+N1feovwVTtKGV/sU5CAzCaPldYrNG14Y6hlbC/WC9XT8AKLK37 eWnbA0xDaICFW1p39JDb0zXuf0+NrsebK+D0acOl7b92e99a0IfhCViQyByAa+teW3/s7ekrehli 38eb6kuwutowRHDoM8ESxrKr6+Np7o0AAJbP8AQAECI0AAAhQgMAECI0AAAhQgMAECI0AAAhQgMA 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