From owner-freebsd-current@FreeBSD.ORG Fri Jun 27 20:42:29 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 B5E2037B401 for ; Fri, 27 Jun 2003 20:42:29 -0700 (PDT) Received: from maeko.hayai.de (maeko.hayai.de [217.172.178.38]) by mx1.FreeBSD.org (Postfix) with ESMTP id CA53144013 for ; Fri, 27 Jun 2003 20:42:28 -0700 (PDT) (envelope-from mail@maeko.hayai.de) Received: from maeko.hayai.de (localhost [127.0.0.1]) by maeko.hayai.de (8.12.7/8.12.7) with ESMTP id h5S3gQ5V003399 (version=TLSv1/SSLv3 cipher=DHE-DSS-AES256-SHA bits=256 verify=NO) for ; Sat, 28 Jun 2003 05:42:26 +0200 Received: (from mail@localhost) by maeko.hayai.de (8.12.7/8.12.7/Submit) id h5S3gQLX003398 for current@freebsd.org; Sat, 28 Jun 2003 05:42:26 +0200 Date: Sat, 28 Jun 2003 05:42:26 +0200 From: Marco Wertejuk To: current@freebsd.org Message-ID: <20030628034226.GA3321@maeko> References: <20030627181836.GA81335@node1.cluster.srrc.usda.gov> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030627181836.GA81335@node1.cluster.srrc.usda.gov> User-Agent: Mutt/1.5.4i 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: Sat, 28 Jun 2003 03:42:30 -0000 In order to give some values to compare: I was recently running an P4 3.06 GHz with Hyperthreading (actually it was Linux, but I will repeat the tests with current when I have time for such games :) Running ubench 0.32 on this HTT enabled machine (i865PE) showed some interesting details when accessing memory: ubench (without parameter): cpu: 111742, memory: 178587, average: 145164 ubench -s (single cpu): cpu: 101993, memory: 135693, average: 118843 With Hyperthreading disabled: ubench (without parameter): cpu: 100878, memory: 133539, average: 117208 ubench -s (single cpu): cpu: 102041, memory: 135296, average: 118668 As you can see, the system has an amazingly improved memory performance when hyperthreading enabled (about 25%) but the overall calculating speed increases only about 9%. Probably you can run ubench on your HTT system earlier than me and post the results here. -- Mit freundlichen Gruessen, Marco Wertejuk - mwcis.com Consulting & Internet Solutions