From owner-freebsd-stable Tue Mar 18 17:43:19 2003 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 8042F37B401 for ; Tue, 18 Mar 2003 17:43:17 -0800 (PST) Received: from odin.ac.hmc.edu (Odin.AC.HMC.Edu [134.173.32.75]) by mx1.FreeBSD.org (Postfix) with ESMTP id ED3A743F75 for ; Tue, 18 Mar 2003 17:43:16 -0800 (PST) (envelope-from brdavis@odin.ac.hmc.edu) Received: from odin.ac.hmc.edu (IDENT:brdavis@localhost.localdomain [127.0.0.1]) by odin.ac.hmc.edu (8.12.3/8.12.3) with ESMTP id h2J1hFJu027307; Tue, 18 Mar 2003 17:43:15 -0800 Received: (from brdavis@localhost) by odin.ac.hmc.edu (8.12.3/8.12.3/Submit) id h2J1hFCE027306; Tue, 18 Mar 2003 17:43:15 -0800 Date: Tue, 18 Mar 2003 17:43:14 -0800 From: Brooks Davis To: Gregory Bond Cc: Brooks Davis , stable@FreeBSD.ORG Subject: Re: Hyperthreading in 4.8RC Message-ID: <20030318174314.A26196@Odin.AC.HMC.Edu> References: <200303190124.MAA15190@lightning.itga.com.au> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-md5; protocol="application/pgp-signature"; boundary="7AUc2qLy4jB3hD7Z" Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <200303190124.MAA15190@lightning.itga.com.au>; from gnb@itga.com.au on Wed, Mar 19, 2003 at 12:24:22PM +1100 X-Virus-Scanned: by amavisd-milter (http://amavis.org/) on odin.ac.hmc.edu Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG --7AUc2qLy4jB3hD7Z Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Mar 19, 2003 at 12:24:22PM +1100, Gregory Bond wrote: > > That CPU doesn't really support hyperthreading except in the vacuous > > sense. It's got enough support that you can boot an SMP kernel, but > > plain P4's below 3.06GHz don't actually have additional logical CPUs > > available. >=20 > Thanks, that sort-of makes sense. What buzz-words do I need to look for = when > shopping for CPU and/or MB? If I get the appropriately fast CPU, will an= y ol' > S478 MB do or does there need to be special support there too? You need a 3.06Mhz P4 or any Xeon to get HTT support. I believe any motherboard that supports those CPUs will work, but if you have an older one, you might need a BIOS upgrade. Be aware that depending on your appliction mix, HTT may help and it may hurt. That's why there's a kernel option. -- Brooks --=20 Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 --7AUc2qLy4jB3hD7Z Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQE+d8syXY6L6fI4GtQRArJgAKC1EGXKNr9St6ut9iWRMeHG5OPw2wCffXJF mkPAuOg+vugn8Ru2X7f3bZ8= =cPaO -----END PGP SIGNATURE----- --7AUc2qLy4jB3hD7Z-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message