From owner-freebsd-questions@FreeBSD.ORG Wed Jan 12 03:50:21 2005 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6D93C16A4CF for ; Wed, 12 Jan 2005 03:50:21 +0000 (GMT) Received: from smtp.knology.net (smtp.knology.net [24.214.63.101]) by mx1.FreeBSD.org (Postfix) with SMTP id EB47743D1D for ; Wed, 12 Jan 2005 03:50:20 +0000 (GMT) (envelope-from dkelly@HiWAAY.net) Received: (qmail 29959 invoked by uid 0); 12 Jan 2005 03:56:41 -0000 Received: from user-69-73-60-132.knology.net (HELO ?10.0.0.68?) (69.73.60.132) by smtp8.knology.net with SMTP; 12 Jan 2005 03:56:41 -0000 Mime-Version: 1.0 (Apple Message framework v619) In-Reply-To: <41E49703.2030209@mac.com> References: <9094-SnapperMsgD246FC56BE0A255B@68.243.126.247> <0D509666-643F-11D9-A9EF-000393BB56F2@HiWAAY.net> <41E49703.2030209@mac.com> Content-Type: multipart/signed; micalg=sha1; boundary=Apple-Mail-5-493070635; protocol="application/pkcs7-signature" Message-Id: <0BD7B3B8-644D-11D9-A9EF-000393BB56F2@HiWAAY.net> From: David Kelly Date: Tue, 11 Jan 2005 21:50:05 -0600 To: FreeBSD_Questions FreeBSD_Questions X-Mailer: Apple Mail (2.619) X-Content-Filtered-By: Mailman/MimeDel 2.1.1 Subject: Re: Hyperthreading hurts 5.3? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Jan 2005 03:50:21 -0000 --Apple-Mail-5-493070635 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; format=flowed On Jan 11, 2005, at 9:18 PM, Chuck Swiger wrote: > David Kelly wrote: >>> (disabling HT will apparently mean I have to reinstall XP on the >>> other >>> drive. >> What does XP have to do with it? IIRC on Dell its F2 during the >> power-on diagnostics to reach the built-in BIOS config. That is where >> HT is to be disabled. > > If you install and configure many flavors of Windows on a SMP system, > that installation will not work if you move that image to a uni-proc > system by swapping disks or otherwise removing CPU's (ie, by turning > off HT'ing). I last saw this with a Win2K system, which immediately > blue-screened with an "invalid SMP HAL" error very early in the boot. OK, that makes Microsoft-logic sense. Had it in my head that he was saying the need to reinstall XP on a HD was to have a utility to toggle the HT bit in BIOS. OTOH I've heard of others toggling the HT bit but don't remember anything about having to reinstall XP. Last I had a similar dealing was with NT4SP4, possibly with the "upgrade" to NT4SP6 when I somehow lost one of my 450 MHz CPU's. Found instructions on how to revive the 2nd CPU but left it alone as it was far better for the company server to be running on one CPU than the risk of damaging the install worse than it already was. Last time I had to reinstall NT4SP6 it took 3 days of patch, reboot, repeat, before the OS install was complete. Decided it was time for a clean wipe installation on my laptop when Panther was released. Believe it took 15 minutes. About the same for a text-only installation of FreeBSD on my Dell Optiplex. -- David Kelly N4HHE, dkelly@HiWAAY.net ======================================================================== Whom computers would destroy, they must first drive mad. --Apple-Mail-5-493070635--