From owner-freebsd-current@FreeBSD.ORG Fri May 21 18:34:00 2004 Return-Path: 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 9055016A4CE for ; Fri, 21 May 2004 18:34:00 -0700 (PDT) Received: from mtaw6.prodigy.net (mtaw6.prodigy.net [64.164.98.56]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8080A43D1D for ; Fri, 21 May 2004 18:34:00 -0700 (PDT) (envelope-from kris@obsecurity.org) Received: from obsecurity.dyndns.org (97dc737d64c4c82aee58708e28fd23f1@adsl-67-115-73-128.dsl.lsan03.pacbell.net [67.115.73.128]) by mtaw6.prodigy.net (8.12.10/8.12.10) with ESMTP id i4M0qQJ3001249; Fri, 21 May 2004 17:52:26 -0700 (PDT) Received: by obsecurity.dyndns.org (Postfix, from userid 1000) id ED3C65494E; Fri, 21 May 2004 17:53:45 -0700 (PDT) Date: Fri, 21 May 2004 17:53:45 -0700 From: Kris Kennaway To: Kevin Oberman Message-ID: <20040522005345.GA12594@xor.obsecurity.org> References: <20040521224729.680285D0A@ptavv.es.net> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="YZ5djTAD1cGYuMQK" Content-Disposition: inline In-Reply-To: <20040521224729.680285D0A@ptavv.es.net> User-Agent: Mutt/1.4.2.1i cc: freebsd-current@freebsd.org Subject: Re: Disk performance under CURRENT X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 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: Sat, 22 May 2004 01:34:00 -0000 --YZ5djTAD1cGYuMQK Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, May 21, 2004 at 03:47:29PM -0700, Kevin Oberman wrote: > I just ran test of disk writing performance under V4 (STABLE) and V5 > (CURRENT) and was surprised at the difference. >=20 > The test was simple and not at all rigorous. Just a dd bs=3D256k > if=3D/dev/zero of=3D/dev/ad2. This is about the simplest way of dealing w= ith > a disk. No file system or anything else. Just raw data to the device. >=20 > Under STABLE, I get an average of 25 MB/sec to the disk. Under CURRENT, > it drops to 15 MB/sec. I did this because I had noted that it was now > taking over an hour to backup my system disk (40 GB) when it was only > taking 40 minutes when I was running V4.6. The STABLE system was built > yesterday. The CURRENT system last Sunday. >=20 > Any idea why this is so much slower? It looks to me like it must be in > either geom or the disk driver. Yes, disk performance sucks on 5.x..this is something phk is planning to work on. Kris --YZ5djTAD1cGYuMQK Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFArqSZWry0BWjoQKURAiCPAJoDdO3kECNWHLgxBJAYH08Y/yRDwgCffsrN 4GGmFJk8QyV0TVll7lTNgx0= =GZpQ -----END PGP SIGNATURE----- --YZ5djTAD1cGYuMQK--