From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1945978AbXDCVbK (ORCPT ); Tue, 3 Apr 2007 17:31:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1945977AbXDCVbJ (ORCPT ); Tue, 3 Apr 2007 17:31:09 -0400 Received: from bay0-omc1-s11.bay0.hotmail.com ([65.54.246.83]:56338 "EHLO bay0-omc1-s11.bay0.hotmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1945978AbXDCVbH (ORCPT ); Tue, 3 Apr 2007 17:31:07 -0400 Message-ID: X-Originating-IP: [88.114.147.249] X-Originating-Email: [paapaa125@hotmail.com] In-Reply-To: <46121BCF.50401@yahoo.com.au> From: "Paa Paa" To: nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org Subject: Re: Lower HD transfer rate with NCQ enabled? Date: Tue, 03 Apr 2007 21:31:04 +0000 Mime-Version: 1.0 Content-Type: text/plain; format=flowed X-OriginalArrivalTime: 03 Apr 2007 21:31:06.0994 (UTC) FILETIME=[639E3520:01C77637] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >>Q: What conclusion can I make on "hdparm -t" results or can I make any >>conclusions? Do I really have lower performance with NCQ or not? If I do, >>is this because of my HD or because of kernel? > >What IO scheduler are you using? If AS or CFQ, could you try with deadline? I was using CFQ. I now tried with Deadline and that doesn't seem to degrade the performance at all! With Deadline I got 60MB/s both with and without NCQ. This was with "hdparm -t". So what does this tell us? _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/