From owner-freebsd-questions@FreeBSD.ORG Wed Jan 12 11:24:00 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 41FD416A4CE for ; Wed, 12 Jan 2005 11:24:00 +0000 (GMT) Received: from aiolos.otenet.gr (aiolos.otenet.gr [195.170.0.23]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7CCF943D2D for ; Wed, 12 Jan 2005 11:23:59 +0000 (GMT) (envelope-from keramida@ceid.upatras.gr) Received: from orion.daedalusnetworks.priv (aris.bedc.ondsl.gr [62.103.39.226])j0CBNvA6002498; Wed, 12 Jan 2005 13:23:57 +0200 Received: from orion.daedalusnetworks.priv (orion [127.0.0.1]) j0CBNvau026504; Wed, 12 Jan 2005 13:23:57 +0200 (EET) (envelope-from keramida@ceid.upatras.gr) Received: (from keramida@localhost)j0CBNtoM026464; Wed, 12 Jan 2005 13:23:55 +0200 (EET) (envelope-from keramida@ceid.upatras.gr) Date: Wed, 12 Jan 2005 13:23:54 +0200 From: Giorgos Keramidas To: Chuck Swiger Message-ID: <20050112112354.GB1651@orion.daedalusnetworks.priv> References: <9094-SnapperMsgD246FC56BE0A255B@68.243.126.247> <0D509666-643F-11D9-A9EF-000393BB56F2@HiWAAY.net> <41E49703.2030209@mac.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <41E49703.2030209@mac.com> cc: David Kelly 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 11:24:00 -0000 On 2005-01-11 22:18, 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. Moving a disk with Windows installed on it to another system has other problems too, although they are not (in general) as serious. Since the user doesn't have the source, many options are 'tuned by the installation process' to the system Windows is installed on. So it doesn't sound as surprising that it would require a reinstall when HTT is toggled :-) > [ 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.... ] True.