From owner-freebsd-hardware@FreeBSD.ORG Mon Apr 16 23:03:24 2007 Return-Path: X-Original-To: freebsd-hardware@freebsd.org Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 7E76216A417; Mon, 16 Apr 2007 23:03:24 +0000 (UTC) (envelope-from kris@obsecurity.org) Received: from elvis.mu.org (elvis.mu.org [192.203.228.196]) by mx1.freebsd.org (Postfix) with ESMTP id 5968313C4D9; Mon, 16 Apr 2007 23:03:24 +0000 (UTC) (envelope-from kris@obsecurity.org) Received: from obsecurity.dyndns.org (elvis.mu.org [192.203.228.196]) by elvis.mu.org (Postfix) with ESMTP id 53ACD1A4D8C; Mon, 16 Apr 2007 16:03:37 -0700 (PDT) Received: by obsecurity.dyndns.org (Postfix, from userid 1000) id 22934513F4; Mon, 16 Apr 2007 19:03:23 -0400 (EDT) Date: Mon, 16 Apr 2007 19:03:23 -0400 From: Kris Kennaway To: "Gelsema, P (Patrick)" Message-ID: <20070416230322.GA69661@xor.obsecurity.org> References: <200704162247.29909.gelsemap@superhero.nl> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="7JfCtLOvnd9MIVvH" Content-Disposition: inline In-Reply-To: <200704162247.29909.gelsemap@superhero.nl> User-Agent: Mutt/1.4.2.2i Cc: freebsd-current@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: Difference between 6.2 and 7.0 Adaptec 39320D - 7.0 performing less X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Apr 2007 23:03:24 -0000 --7JfCtLOvnd9MIVvH Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Apr 16, 2007 at 10:47:24PM +0200, Gelsema, P (Patrick) wrote: > Goodevening lists, >=20 > I am toying with Freebsd 7 to see if it will and how it runs on my new As= us=20 > M2N mainboard. One of the things I noticed is that when running=20 > 7.0-Current-200704 the throughput of the SCSI drive seems halved. When=20 > running 6.2 throughput is doubled/normal. >=20 > Throughput is measured with the following command. >=20 > dd if=3D/dev/zero of=3D/usr/test > where /usr resides on da0s1f >=20 > On 7.0 I get about 33MB/sec > On 6.2 I get about 69Mb/sec >=20 > I did not make any changes, installation is fresh from CD with Minimal as= =20 > distribution. Apparently you weren't paying attention during boot, because 7.0 ships with heavy debugging options enabled, and tells you about it up front: "WARNING: WITNESS option enabled, expect reduced performance.\n"; Recompile your kernel with debugging options disabled before making performance comparisons. Kris --7JfCtLOvnd9MIVvH Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFGJAC6Wry0BWjoQKURAv0sAJ0dd0PPYZ+8Dk6aFgZJJI9tJGH51wCg7S2T DBOgChfHDflj992dewZge+4= =7Jg8 -----END PGP SIGNATURE----- --7JfCtLOvnd9MIVvH--