From owner-freebsd-current@FreeBSD.ORG Wed Mar 1 11:17:36 2006 Return-Path: X-Original-To: current@FreeBSD.ORG Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id F331A16A420; Wed, 1 Mar 2006 11:17:35 +0000 (GMT) (envelope-from sos@deepcore.dk) Received: from spider.deepcore.dk (cpe.atm2-0-53484.0x50a6c9a6.abnxx9.customer.tele.dk [80.166.201.166]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5D87843D45; Wed, 1 Mar 2006 11:17:35 +0000 (GMT) (envelope-from sos@deepcore.dk) Received: from [194.192.25.142] (spider.deepcore.dk [194.192.25.142]) by spider.deepcore.dk (8.13.4/8.13.4) with ESMTP id k21BHGcT003818; Wed, 1 Mar 2006 12:17:17 +0100 (CET) (envelope-from sos@deepcore.dk) Message-ID: <440582BC.30407@deepcore.dk> Date: Wed, 01 Mar 2006 12:17:16 +0100 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= User-Agent: Thunderbird 1.5 (X11/20060213) MIME-Version: 1.0 To: Derek Ragona References: <200603010505.k2155HfQ003205@aldan.algebra.com> <6.0.0.22.2.20060301045410.02659620@mail.computinginnovations.com> In-Reply-To: <6.0.0.22.2.20060301045410.02659620@mail.computinginnovations.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-mail-scanned: by DeepCore Virus & Spam killer v1.16 Cc: sos@FreeBSD.ORG, "Mikhail T." , current@FreeBSD.ORG Subject: Re: pitiful performance of an SATA150 drive X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Mar 2006 11:17:36 -0000 Derek Ragona wrote: > The 500 GB drives I have seen are SATA300, backward compatible to > SATA150. If your's is SATA300, you might consider replacing the > controller with an add-on SATA300 controller. That would make no difference whatsoever, todays drives are not even close to maxing out the SATA150 interface speed. > You didn't say what brand or model your drive is. Different models come > with different sizes caches on the drives which effects performance. > Also depending on the drive read or write caching may or may NOT be > enabled. Usually the drive manufacturer has a utility to examine and > set these values. Caches are always turned on pr default in FreeBSD (if they exist), so nothing to get here *unless* write cache is turned of in the loader. >> I installed a new 500Gb SATA drive into my 6.1 system and am greatly >> disappointed with its performance. Although straight reading is >> Ok at around 32Mb/s, the writing is never more than 7Mb/s (as reported >> by `systat 1 -vm' while running `cat < /dev/zero > /dev/ad8'). The problem is the blocksize that gets in the way of utilizing full transfer speed. As I told the originator earlier in private mail one could use dd with a blocksize of 1Mbyte to test the actual max transfer speed to/from the drive. -Søren