From owner-freebsd-smp Fri Mar 14 8:18:51 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 A6EB037B401 for ; Fri, 14 Mar 2003 08:18:49 -0800 (PST) Received: from mail.speakeasy.net (mail15.speakeasy.net [216.254.0.215]) by mx1.FreeBSD.org (Postfix) with ESMTP id 610EE43FBF for ; Fri, 14 Mar 2003 08:18:46 -0800 (PST) (envelope-from jhb@FreeBSD.org) Received: (qmail 15342 invoked from network); 14 Mar 2003 16:18:48 -0000 Received: from unknown (HELO server.baldwin.cx) ([216.27.160.63]) (envelope-sender ) by mail15.speakeasy.net (qmail-ldap-1.03) with DES-CBC3-SHA encrypted SMTP for ; 14 Mar 2003 16:18:48 -0000 Received: from laptop.baldwin.cx (gw1.twc.weather.com [216.133.140.1]) by server.baldwin.cx (8.12.8/8.12.8) with ESMTP id h2EGIhOv053222; Fri, 14 Mar 2003 11:18:43 -0500 (EST) (envelope-from jhb@FreeBSD.org) Message-ID: X-Mailer: XFMail 1.5.2 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Fri, 14 Mar 2003 11:19:01 -0500 (EST) From: John Baldwin To: Nicolas Kowalski Subject: Re: SMP and Hyperthreading Info Cc: freebsd-smp@FreeBSD.org 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 On 14-Mar-2003 Nicolas Kowalski wrote: > 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 ? It is an option on current. I need to backport it so that it will be a kernel option on 4.8 as well. > 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 -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message