From owner-freebsd-questions@FreeBSD.ORG Wed Jan 12 03:19:04 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 05BF016A4CE for ; Wed, 12 Jan 2005 03:19:04 +0000 (GMT) Received: from pi.codefab.com (pi.codefab.com [199.103.21.227]) by mx1.FreeBSD.org (Postfix) with ESMTP id 969EA43D62 for ; Wed, 12 Jan 2005 03:19:01 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from [192.168.1.3] (pool-68-160-208-232.ny325.east.verizon.net [68.160.208.232]) by pi.codefab.com (8.12.11/8.12.11) with ESMTP id j0C3IuCk061428 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 11 Jan 2005 22:18:57 -0500 (EST) Message-ID: <41E49703.2030209@mac.com> Date: Tue, 11 Jan 2005 22:18:27 -0500 From: Chuck Swiger Organization: The Courts of Chaos User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041217 X-Accept-Language: en-us, en MIME-Version: 1.0 To: David Kelly References: <9094-SnapperMsgD246FC56BE0A255B@68.243.126.247> <0D509666-643F-11D9-A9EF-000393BB56F2@HiWAAY.net> In-Reply-To: <0D509666-643F-11D9-A9EF-000393BB56F2@HiWAAY.net> X-Enigmail-Version: 0.90.0.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=1.8 required=5.5 tests=AWL,RCVD_IN_NJABL_DUL, RCVD_IN_SORBS_DUL autolearn=disabled version=3.0.1 X-Spam-Level: * X-Spam-Checker-Version: SpamAssassin 3.0.1 (2004-10-22) on pi.codefab.com cc: "Timothy J. Luoma" cc: freebsd-questions@freebsd.org 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 03:19:04 -0000 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. [ It doesn't surprise me that one would want or have to reinstall XP after disabling HyperThreading. There exist even less comprehensible reasons which oblige people to reinstall Windows.... ] -- -Chuck