From owner-freebsd-current@FreeBSD.ORG Thu Aug 14 10:10:34 2003 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 C8D6137B401 for ; Thu, 14 Aug 2003 10:10:34 -0700 (PDT) Received: from odin.ac.hmc.edu (Odin.AC.HMC.Edu [134.173.32.75]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3EF8043FAF for ; Thu, 14 Aug 2003 10:10:34 -0700 (PDT) (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 (8.12.9/8.12.3) with ESMTP id h7EHAU7c010454; Thu, 14 Aug 2003 10:10:30 -0700 Received: (from brdavis@localhost) by odin.ac.hmc.edu (8.12.9/8.12.3/Submit) id h7EHAUHP010432; Thu, 14 Aug 2003 10:10:30 -0700 Date: Thu, 14 Aug 2003 10:10:30 -0700 From: Brooks Davis To: "David R. Colyer" Message-ID: <20030814171021.GB1806@Odin.AC.HMC.Edu> References: <200308140959.58487.davedillinger@wyoming.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="rJwd6BRFiFCcLxzm" Content-Disposition: inline In-Reply-To: <200308140959.58487.davedillinger@wyoming.com> User-Agent: Mutt/1.5.4i X-Virus-Scanned: by amavisd-milter (http://amavis.org/) on odin.ac.hmc.edu cc: freebsd-current@freebsd.org Subject: Re: Dual P4 2.4Ghz Xeon With Hyperthreading enabled... 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: Thu, 14 Aug 2003 17:10:35 -0000 --rJwd6BRFiFCcLxzm Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Aug 14, 2003 at 09:59:58AM -0600, David R. Colyer wrote: > No doubt this has been answered before, but I have an asus p4pe with a 3.= 06=20 > p4. Naturally, it is enabled in the bios. To enable hyperthreading do I= =20 > need to recompile my kernel with smp support, and if so...does this apply= to=20 > freebsd 5.1 release as well? (my friend wants to know). Additionally do= es=20 > changing the machdep.cpu_idle_hlt to zero make it faster? Thanks in adva= nce. Yes, you need SMP support in all releases. As to your second question, define faster. It depends heavily on your appliction mix. My guess is that on a UP system which is doing something other then running a single compute bound process it's going to be a minor win, but only measurement will tell you anything. -- Brooks --rJwd6BRFiFCcLxzm Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQE/O8J8XY6L6fI4GtQRAheqAJ95jTNUwzsLUCl+4nWemHbvbaIyIwCgxua9 w7yh6F2eXYNUIaL1k9SOJdo= =N4NR -----END PGP SIGNATURE----- --rJwd6BRFiFCcLxzm--