From owner-freebsd-current@FreeBSD.ORG Fri Jun 27 16:39:55 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id AA1F437B401 for ; Fri, 27 Jun 2003 16:39:55 -0700 (PDT) Received: from smtpout.mac.com (smtpout.mac.com [17.250.248.87]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2735743FCB for ; Fri, 27 Jun 2003 16:39:55 -0700 (PDT) (envelope-from leimy2k@mac.com) Received: from mac.com (smtpin08-en2 [10.13.10.153]) by smtpout.mac.com (Xserve/MantshX 2.0) with ESMTP id h5RNds4U029220; Fri, 27 Jun 2003 16:39:54 -0700 (PDT) Received: from mac.com (adsl-156-167-162.jan.bellsouth.net [66.156.167.162]) (authenticated bits=0) by mac.com (Xserve/8.12.9/MantshX 2.0) with ESMTP id h5RNdoFK028881; Fri, 27 Jun 2003 16:39:52 -0700 (PDT) Date: Fri, 27 Jun 2003 18:39:49 -0500 Content-Type: text/plain; charset=US-ASCII; format=flowed Mime-Version: 1.0 (Apple Message framework v552) To: Doug White From: David Leimbach In-Reply-To: <20030627154252.X5016@carver.gumbysoft.com> Message-Id: Content-Transfer-Encoding: 7bit X-Mailer: Apple Mail (2.552) cc: current@freebsd.org cc: Glenn Johnson Subject: Re: Hyperthreading X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Jun 2003 23:39:56 -0000 On Friday, June 27, 2003, at 05:46 PM, Doug White wrote: > On Fri, 27 Jun 2003, Glenn Johnson wrote: > >> I have a P4 processor on order that will support hyperthreading. I >> was >> wondering what the general opinion is on enabling HTT for FreeBSD-5 >> (current). >> >> Thanks for any input. > He didn't ask how... he asked for OPINIONs. Its been my experience that most OSes don't do any better with hyperthreading on.. Now I haven't tried with FreeBSD but at my company we disable hyperthreading in the BIOS by default. Supposedly the brand spanking new Intel chip will have better hyperthreading but the real results remain to be seen. > man 4 smp > > See the machdep.hlt_logical_cpus sysctl. > > -- > Doug White | FreeBSD: The Power to Serve > dwhite@gumbysoft.com | www.FreeBSD.org > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to > "freebsd-current-unsubscribe@freebsd.org"