From owner-freebsd-stable@FreeBSD.ORG Tue Nov 29 18:59:08 2005 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8D39316A420 for ; Tue, 29 Nov 2005 18:59:08 +0000 (GMT) (envelope-from oberman@es.net) Received: from postal2.es.net (postal2.es.net [198.128.3.206]) by mx1.FreeBSD.org (Postfix) with ESMTP id CD6FB43D5F for ; Tue, 29 Nov 2005 18:59:07 +0000 (GMT) (envelope-from oberman@es.net) Received: from ptavv.es.net ([198.128.4.29]) by postal2.es.net (Postal Node 2) with ESMTP (SSL) id IBA74465; Tue, 29 Nov 2005 10:58:55 -0800 Received: from ptavv (localhost [127.0.0.1]) by ptavv.es.net (Tachyon Server) with ESMTP id 05A765D04; Tue, 29 Nov 2005 10:58:53 -0800 (PST) X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.0.4 To: Claus Guttesen In-reply-to: Your message of "Tue, 29 Nov 2005 16:46:48 +0100." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 29 Nov 2005 10:58:53 -0800 From: "Kevin Oberman" Message-Id: <20051129185853.05A765D04@ptavv.es.net> Cc: freebsd-stable@freebsd.org, Dan Charrois Subject: Re: FreeBSD unstable on Dell 1750 using SMP? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 29 Nov 2005 18:59:08 -0000 As far as I can tell, hyperthreading is not much of a win for anyone. See hte article at: http://news.zdnet.co.uk/0,39020330,39237341,00.htmhttp://news.zdnet .co.uk/0,39020330,39237341,00.htm It reports that HTT slows performance even on threaded and, theoretically HTT ideal apps. (And this was with Windows.) -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634