From owner-freebsd-hackers@FreeBSD.ORG Tue May 10 01:56:03 2005 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 90A4716A4EB for ; Tue, 10 May 2005 01:56:03 +0000 (GMT) Received: from smarthost2.sentex.ca (smarthost2.sentex.ca [205.211.164.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1688843D68 for ; Tue, 10 May 2005 01:56:03 +0000 (GMT) (envelope-from mike@sentex.net) Received: from BLUELAPIS.sentex.ca (cage.simianscience.com [64.7.134.1]) by smarthost2.sentex.ca (8.13.3/8.13.3) with SMTP id j4A1txW1097236; Mon, 9 May 2005 21:55:59 -0400 (EDT) (envelope-from mike@sentex.net) From: Mike Tancsa To: Dan Nelson Date: Mon, 09 May 2005 21:56:05 -0400 Message-ID: <0350819dcs9asmaioaqo4kuhhsqmlg0t06@4ax.com> References: <427FA802.90805@chamkila.org> <427FA8CD.8040405@centtech.com> <427FAB5F.6070508@chamkila.org> <427FAF73.7070702@centtech.com> <20050509190245.GF38839@dan.emsphone.com> In-Reply-To: <20050509190245.GF38839@dan.emsphone.com> X-Mailer: Forte Agent 1.93/32.576 English (American) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable X-Virus-Scanned: ClamAV version 0.84, clamav-milter version 0.84e on smarthost2.sentex.ca X-Virus-Status: Clean cc: freebsd-hackers@freebsd.org Subject: Re: Low HDD tranfer rate with FreeBSD 5.3-Release X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 May 2005 01:56:04 -0000 On Mon, 9 May 2005 14:02:45 -0500, in sentex.lists.freebsd.hackers you wrote: > >Yes, try 64k instead of 8k, and also compare read speeds. If you have >the time (could take an hour or so), try "dd if=3D/dev/ad0 = of=3D/dev/null >bs=3D64k", run an "iostat 60" in another window, let the dd run through >the entire disk, and compare the relative speeds from start to finish. > >For the DiamondMax 160, the sustained throughput should be 26MB -> 50MB >as you go from inner to outer tracks. Not sure how honest diskinfo is, but the numbers do seem somewhat reasonable for checking these values. [releng5-865]# diskinfo -t ad0 ad0 512 # sectorsize 40020664320 # mediasize in bytes (37G) 78165360 # mediasize in sectors 77545 # Cylinders according to firmware. 16 # Heads according to firmware. 63 # Sectors according to firmware. Seek times: Full stroke: 250 iter in 5.641185 sec =3D 22.565 msec Half stroke: 250 iter in 4.381489 sec =3D 17.526 msec Quarter stroke: 500 iter in 7.043785 sec =3D 14.088 msec Short forward: 400 iter in 1.625114 sec =3D 4.063 msec Short backward: 400 iter in 1.524874 sec =3D 3.812 msec Seq outer: 2048 iter in 0.233424 sec =3D 0.114 msec Seq inner: 2048 iter in 0.224814 sec =3D 0.110 msec Transfer rates: outside: 102400 kbytes in 1.787498 sec =3D 57287 kbytes/sec middle: 102400 kbytes in 2.175933 sec =3D 47060 kbytes/sec inside: 102400 kbytes in 3.416033 sec =3D 29976 kbytes/sec [releng5-865]#=20 ---Mike -------------------------------------------------------- Mike Tancsa, Sentex communications http://www.sentex.net Providing Internet Access since 1994 mike@sentex.net, (http://www.tancsa.com)