From owner-freebsd-smp Fri Mar 14 2:11:32 2003 Delivered-To: freebsd-smp@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id F085637B401 for ; Fri, 14 Mar 2003 02:11:30 -0800 (PST) Received: from imag.imag.fr (imag.imag.fr [129.88.30.1]) by mx1.FreeBSD.org (Postfix) with ESMTP id 59DDB43F3F for ; Fri, 14 Mar 2003 02:11:29 -0800 (PST) (envelope-from Nicolas.Kowalski@imag.fr) Received: from pave.imag.fr (pave.imag.fr [129.88.43.12]) by imag.imag.fr (8.12.8/8.12.8) with ESMTP id h2EABRZa017987 for ; Fri, 14 Mar 2003 11:11:27 +0100 (CET) Received: from astazou.imag.fr (kowalski@astazou [129.88.43.102]) by pave.imag.fr (8.12.8/8.12.7/ImagV2) with ESMTP id h2EABQxA085907 for ; Fri, 14 Mar 2003 11:11:27 +0100 (MET) (envelope-from kowalski@imag.fr) To: freebsd-smp@FreeBSD.org Subject: Re: SMP and Hyperthreading Info From: Nicolas Kowalski Date: Fri, 14 Mar 2003 11:11:26 +0100 In-Reply-To: (John Baldwin's message of "Thu, 13 Mar 2003 17:55:33 -0500 (EST)") Message-ID: User-Agent: Gnus/5.090016 (Oort Gnus v0.16) XEmacs/21.4 (Common Lisp, linux) References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org John Baldwin writes: > Right now we just spin up the logical CPU's as if they were extra CPUs. > There isn't any special treatment in the schedule for logical CPUs. Just a question : is there a way (kernel option ?) to disable Hyperthreading, so that FreeBSD only uses two physical CPUs ? I am running FreeBSD 4.8-RC on a Compaq ML370 dual-Xeon, and disabling HT in the BIOS has no effect. Thanks in advance. -- Nicolas To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message