Date: Tue, 11 Jan 2005 22:18:27 -0500 From: Chuck Swiger <cswiger@mac.com> To: David Kelly <dkelly@HiWAAY.net> Cc: freebsd-questions@freebsd.org Subject: Re: Hyperthreading hurts 5.3? Message-ID: <41E49703.2030209@mac.com> In-Reply-To: <0D509666-643F-11D9-A9EF-000393BB56F2@HiWAAY.net> References: <9094-SnapperMsgD246FC56BE0A255B@68.243.126.247> <0D509666-643F-11D9-A9EF-000393BB56F2@HiWAAY.net>
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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
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