From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263009AbTDFPUJ (for ); Sun, 6 Apr 2003 11:20:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263010AbTDFPUJ (for ); Sun, 6 Apr 2003 11:20:09 -0400 Received: from siaag2ac.compuserve.com ([149.174.40.133]:8376 "EHLO siaag2ac.compuserve.com") by vger.kernel.org with ESMTP id S263009AbTDFPUI (for ); Sun, 6 Apr 2003 11:20:08 -0400 Date: Sun, 6 Apr 2003 11:29:00 -0400 From: Chuck Ebbert <76306.1226@compuserve.com> Subject: tuning disk on 3ware /performance problem To: Stephan van Hienen Cc: linux-kernel Message-ID: <200304061131_MC3-1-333A-E630@compuserve.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > Is there anything i can do to tune the drives connected to he 3ware > controller ? (37MB/sec vs 43MB/sec) (and why is the seq. output block > 65MB/sec on the 3ware vs 41MB/sec on 'ide controllers') Try doing a real test with a 1 GB file on an empty filesystem: # mount /fs && date # time dd if=/dev/zero of=/fs/file1 bs=128k count=8k # umount /fs && date && mount /fs # time dd if=/fs/file1 of=/dev/null bs=128k I get numbers that disagree with hdparm by a large amount. -- Chuck I am not a number!