From owner-freebsd-stable@FreeBSD.ORG Wed Apr 25 14:08:17 2007 Return-Path: X-Original-To: freebsd-stable@FreeBSD.ORG Delivered-To: freebsd-stable@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id B3BED16A401 for ; Wed, 25 Apr 2007 14:08:17 +0000 (UTC) (envelope-from olli@lurza.secnetix.de) Received: from lurza.secnetix.de (lurza.secnetix.de [83.120.8.8]) by mx1.freebsd.org (Postfix) with ESMTP id 29F7513C468 for ; Wed, 25 Apr 2007 14:08:16 +0000 (UTC) (envelope-from olli@lurza.secnetix.de) Received: from lurza.secnetix.de (qjylqn@localhost [127.0.0.1]) by lurza.secnetix.de (8.13.4/8.13.4) with ESMTP id l3PE86Ut059659; Wed, 25 Apr 2007 16:08:15 +0200 (CEST) (envelope-from oliver.fromme@secnetix.de) Received: (from olli@localhost) by lurza.secnetix.de (8.13.4/8.13.1/Submit) id l3PE86XV059658; Wed, 25 Apr 2007 16:08:06 +0200 (CEST) (envelope-from olli) Date: Wed, 25 Apr 2007 16:08:06 +0200 (CEST) Message-Id: <200704251408.l3PE86XV059658@lurza.secnetix.de> From: Oliver Fromme To: freebsd-stable@FreeBSD.ORG, tarkhil@webmail.sub.ru In-Reply-To: <462F15B4.4010201@webmail.sub.ru> X-Newsgroups: list.freebsd-stable User-Agent: tin/1.8.2-20060425 ("Shillay") (UNIX) (FreeBSD/4.11-STABLE (i386)) MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-2.1.2 (lurza.secnetix.de [127.0.0.1]); Wed, 25 Apr 2007 16:08:15 +0200 (CEST) Cc: Subject: Re: 6.2-RELEASE does not use second CPU on pentium D X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: freebsd-stable@FreeBSD.ORG, tarkhil@webmail.sub.ru List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Apr 2007 14:08:17 -0000 Alex Povolotsky wrote: > I have a Pentium D box, running 6.2-RELEASE. In dmesg, I see CPU#1 > launched, but I never see any process running on it, and mptable shows Hyperthreading is disabled by default in FreeBSD (for security reasons). You can enable it via sysctl if you want (machdep.hyperthreading_allowed=1). However, note that it might not make your machine any faster (in fact, a UP kernel might be faster; it depends on the kind of programs that you're running). Also not that there is a potential security issue with hyper- threading (information leak). Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "When your hammer is C++, everything begins to look like a thumb." -- Steve Haflich, in comp.lang.c++