Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261540AbVE3GFL (ORCPT ); Mon, 30 May 2005 02:05:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261537AbVE3GFK (ORCPT ); Mon, 30 May 2005 02:05:10 -0400 Received: from brick.kernel.dk ([62.242.22.158]:54659 "EHLO nelson.home.kernel.dk") by vger.kernel.org with ESMTP id S261536AbVE3GE6 (ORCPT ); Mon, 30 May 2005 02:04:58 -0400 Date: Mon, 30 May 2005 08:05:57 +0200 From: Jens Axboe To: Jeff Garzik Cc: Michael Thonke , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Playing with SATA NCQ Message-ID: <20050530060556.GC7054@suse.de> References: <20050526140058.GR1419@suse.de> <429793C8.8090007@gmail.com> <42979C4F.8020007@pobox.com> <42979FA3.1010106@gmail.com> <20050528121258.GA17869@suse.de> <4299BD23.6010004@gmail.com> <20050529190259.GA29770@suse.de> <429A2238.8010604@gmail.com> <429A236D.8030307@pobox.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <429A236D.8030307@pobox.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 739 Lines: 22 On Sun, May 29 2005, Jeff Garzik wrote: > Michael Thonke wrote: > >Well the subjective feeling is great through! What I noticed is a > >improvement on rsync (goes slighty faster drive to drive). > >The noise decrease now it only make noise on very heavy IO reads and > >writes. > > > It might be as simple as... NCQ means the drive is doing more work. > More work means more noise. You can argue both ways :-). Usually more noise means more seeks and thus less work done. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/