From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030445AbWFITaP (ORCPT ); Fri, 9 Jun 2006 15:30:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030449AbWFITaP (ORCPT ); Fri, 9 Jun 2006 15:30:15 -0400 Received: from wx-out-0102.google.com ([66.249.82.200]:28538 "EHLO wx-out-0102.google.com") by vger.kernel.org with ESMTP id S1030445AbWFITaN (ORCPT ); Fri, 9 Jun 2006 15:30:13 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=B48Jy6Ejx/ZRKeyFO653uiqBMcx5fktHKURjNtJPX0dLzOJK3kMR2EPexxuiM4EiVcULAUNxNTdQz0mkyMoIbWBnImo+McgEl8mKVv+vo4cX007N/r7yXGqTXhMI+uA7xgPMoA5L0mLbMP9efrlrD7DHd12ZYOFrK5SRYYg5WNY= Message-ID: <4745278c0606091230g1cff8514vc6ad154acb62e341@mail.gmail.com> Date: Fri, 9 Jun 2006 15:30:12 -0400 From: "Vishal Patil" To: linux-kernel@vger.kernel.org Subject: CSCAN vs CFQ I/O scheduler benchmark results MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello I ran the sysbench benchmark to compare the CSCAN I/O scheduler against the CFQ scheduler and following are the results. The results are interesting especially in case of sequential writes and the random workloads Latency (seconds) seq seq seq rnd rnd rnd reads writes r + w reads writes r + w -------------------------------------------------------------------------------------- CFQ 0.0116 0.0164 0.0107 0.1178 0.0423 0.0605 CSCAN 0.0148 0.0092 0.0169 0.1043 0.0473 0.0732 Throughput (MB/seconds) seq seq seq rnd rnd rnd reads writes r + w reads writes r + w -------------------------------------------------------------------------------------- CFQ 19.062 15.251 22.127 2.1197 1.0032 1.376 CSCAN 14.553 22.108 14.72 2.394 0.9304 1.399 The machine configuation is as follows CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz Memory: 1027500 KB (1 GB) Filesystem: ext3 Kernel: 2.6.16.2 If interseted you may have a look at the raw data at http://www.google.com/notebook/public/14554179817860061151/BDQtXSwoQ2_mdxLgh - Vishal