From owner-freebsd-stable@FreeBSD.ORG Mon Apr 10 13:59:28 2006 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C69FB16A401 for ; Mon, 10 Apr 2006 13:59:28 +0000 (UTC) (envelope-from lopisaur@gmail.com) Received: from xproxy.gmail.com (xproxy.gmail.com [66.249.82.200]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2F5EF43D45 for ; Mon, 10 Apr 2006 13:59:28 +0000 (GMT) (envelope-from lopisaur@gmail.com) Received: by xproxy.gmail.com with SMTP id s9so641457wxc for ; Mon, 10 Apr 2006 06:59:27 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:subject:from:reply-to:to:cc:in-reply-to:references:content-type:date:message-id:mime-version:x-mailer; b=Nv7nB66dWseK0iCPMUky4YdyRZxM7F76qBD7NUiCrzb7Y82SbrFiYvuNGW7mEF1YIi6of9gdEJtJtMFBM4uFbE35ZcyKntyBNXqV4hHk2bPX9UKFHbWVAO3b7K4TRK07UjUmPejxreMOifkz8y4eMGkpRqIpgFHJuuAScuViyio= Received: by 10.70.94.11 with SMTP id r11mr305957wxb; Mon, 10 Apr 2006 06:59:27 -0700 (PDT) Received: from hellion.clcw ( [200.105.223.42]) by mx.gmail.com with ESMTP id i35sm272039wxd.2006.04.10.06.59.24; Mon, 10 Apr 2006 06:59:26 -0700 (PDT) From: Christian Lopez de Castilla Wagner To: "Matthew D. Fuller" In-Reply-To: <20060409182254.GL41551@over-yonder.net> References: <20060406192950.GE700@turion.vk2pj.dyndns.org> <20060408203233.K67402@woozle.rinet.ru> <20060408212421.GB720@turion.vk2pj.dyndns.org> <20060408160304.ek1xxodrkok4gw4g@webmail.1command.com> <44384EB8.8090803@samsco.org> <20060409182254.GL41551@over-yonder.net> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-JasmssWam71ZxzxUeVSV" Date: Mon, 10 Apr 2006 10:02:34 -0400 Message-Id: <1144677754.28282.5.camel@hellion.clcw> Mime-Version: 1.0 X-Mailer: Evolution 2.4.2.1 FreeBSD GNOME Team Port Cc: freebsd-stable@freebsd.org, "Chris H." Subject: Re: Pros and Cons of amd64 (versus i386). X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: lopisaur@gmail.com List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Apr 2006 13:59:29 -0000 --=-JasmssWam71ZxzxUeVSV Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Sun, 2006-04-09 at 13:22 -0500, Matthew D. Fuller wrote: > On Sat, Apr 08, 2006 at 06:00:56PM -0600 I heard the voice of > Scott Long, and lo! it spake thus: > >=20 > > Modern disks (I don't know how to define a cutoff to this term, > > unfortunately) definitely put more bits onto the outer rim of the > > platter than the inner rim. >=20 > Pretty much any disk you'd currently find, I'd say. >=20 > diskinfo -t won't run through on my 4 or 2 gigs ("disk too small for > test" :), but on my 9 gigger: >=20 > Transfer rates: > outside: 102400 kbytes in 5.215159 sec =3D 19635 kbyte= s/sec > middle: 102400 kbytes in 6.268067 sec =3D 16337 kbyte= s/sec > inside: 102400 kbytes in 8.237962 sec =3D 12430 kbyte= s/sec >=20 > da4 at ahc2 bus 0 target 5 lun 0 > da4: Fixed Direct Access SCSI-3 device=20 > da4: 40.000MB/s transfers (20.000MHz, offset 31, 16bit), Tagged Queueing = Enabled > da4: 8748MB (17916240 512 byte sectors: 255H 63S/T 1115C) >=20 >=20 Just for comparison: root@hellion# diskinfo -t ad1 ad1 512 # sectorsize 61492838400 # mediasize in bytes (57G) 120103200 # mediasize in sectors 119150 # Cylinders according to firmware. 16 # Heads according to firmware. 63 # Sectors according to firmware. Seek times: Full stroke: 250 iter in 5.650173 sec =3D 22.601 msec Half stroke: 250 iter in 4.581880 sec =3D 18.328 msec Quarter stroke: 500 iter in 7.510191 sec =3D 15.020 msec Short forward: 400 iter in 3.556557 sec =3D 8.891 msec Short backward: 400 iter in 3.294277 sec =3D 8.236 msec Seq outer: 2048 iter in 0.285684 sec =3D 0.139 msec Seq inner: 2048 iter in 0.288960 sec =3D 0.141 msec Transfer rates: outside: 102400 kbytes in 1.896157 sec =3D 54004 kbytes/sec middle: 102400 kbytes in 2.297042 sec =3D 44579 kbytes/sec inside: 102400 kbytes in 3.853005 sec =3D 26577 kbytes/sec ad1: 58644MB at ata0-slave UDMA100 As you can see, the outside is more than twice as fast in this case. Just a guess, since both are IBM disks: You're using a Workstation/Server disk, which probably performs in a more balanced way across the platter, while this (consumer disk) is not performance-oriented. Maybe SCSI and IDE devices are not as similar as we all thought? --=20 Christian Lopez de Castilla Wagner lopisaur@gmail.com lopisaur@acelerate.com (+591-705)98290 http://lopisaur.googlepages.com http://lopisaur.blogspot.com --=-JasmssWam71ZxzxUeVSV Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (FreeBSD) iD8DBQBEOmV6BfwpMEg+qbYRAk/qAKCH8vG4xzjn8vEXnQlG5FXL4RDXbwCcDeBR 5WbH0T+8eE+fcrytR7186R0= =0W+T -----END PGP SIGNATURE----- --=-JasmssWam71ZxzxUeVSV--