From owner-freebsd-questions@FreeBSD.ORG Thu Jan 5 17:49:07 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org 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 48EA416A41F for ; Thu, 5 Jan 2006 17:49:07 +0000 (GMT) (envelope-from cperciva@freebsd.org) Received: from pd4mo1so.prod.shaw.ca (shawidc-mo1.cg.shawcable.net [24.71.223.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6458C43D62 for ; Thu, 5 Jan 2006 17:49:06 +0000 (GMT) (envelope-from cperciva@freebsd.org) Received: from pd5mr7so.prod.shaw.ca (pd5mr7so-qfe3.prod.shaw.ca [10.0.141.183]) by l-daemon (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004)) with ESMTP id <0ISM006NKS43WV40@l-daemon> for freebsd-questions@freebsd.org; Thu, 05 Jan 2006 10:48:03 -0700 (MST) Received: from pn2ml8so.prod.shaw.ca ([10.0.121.152]) by pd5mr7so.prod.shaw.ca (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004)) with ESMTP id <0ISM009GOS43GM70@pd5mr7so.prod.shaw.ca> for freebsd-questions@freebsd.org; Thu, 05 Jan 2006 10:48:03 -0700 (MST) Received: from [192.168.0.60] ([24.87.209.6]) by l-daemon (Sun ONE Messaging Server 6.0 HotFix 1.01 (built Mar 15 2004)) with ESMTP id <0ISM00AE5S3ZT480@l-daemon> for freebsd-questions@freebsd.org; Thu, 05 Jan 2006 10:48:03 -0700 (MST) Date: Thu, 05 Jan 2006 09:47:35 -0800 From: Colin Percival In-reply-to: <60578543.20060105183452@lifeforms.nl> To: Walter Hop Message-id: <43BD5BB7.9050508@freebsd.org> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-1 Content-transfer-encoding: 7bit X-Accept-Language: en-us, en X-Enigmail-Version: 0.93.0.0 References: <60578543.20060105183452@lifeforms.nl> User-Agent: Mozilla Thunderbird 1.0.7 (X11/20051228) Cc: freebsd-questions@freebsd.org Subject: Re: Kernel forces machdep.hlt_cpus, how to change? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Jan 2006 17:49:07 -0000 Walter Hop wrote: > I'm testing out FreeBSD 6.0R on a Dual Xeon. I want to do some > benchmarking of hyperthreading before I put this machine into use, so > I am trying to turn off the HLTing of logical cpu's. Read FreeBSD-SA-05:09.htt : ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.htt.asc and then, if you don't have any local untrusted users, consider setting machdep.hyperthreading_allowed=1 in /boot/loader.conf. Colin Percival