From owner-freebsd-smp@FreeBSD.ORG Sat Sep 25 14:48:18 2004 Return-Path: Delivered-To: freebsd-smp@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 1169116A4CE for ; Sat, 25 Sep 2004 14:48:18 +0000 (GMT) Received: from cs.columbia.edu (cs.columbia.edu [128.59.16.20]) by mx1.FreeBSD.org (Postfix) with ESMTP id B544843D49 for ; Sat, 25 Sep 2004 14:48:17 +0000 (GMT) (envelope-from mre2007@cs.columbia.edu) Received: from hydra.cs.columbia.edu (IDENT:lv9bg2M0FAfnSyqUDMN1qmyxoeS0rtBu@hydra.cs.columbia.edu [128.59.16.129]) by cs.columbia.edu (8.12.10/8.12.10) with ESMTP id i8PEmBwG007889 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NOT) for ; Sat, 25 Sep 2004 10:48:12 -0400 (EDT) Received: from webmail.cs.columbia.edu (IDENT:2Z2W/cxENvHSJO89Uo6A9tYm4SeyBJC1@localhost [127.0.0.1]) i8PEmBAr026414 for ; Sat, 25 Sep 2004 10:48:11 -0400 Received: from 24.243.189.238 (SquirrelMail authenticated user mre2007) by webmail.cs.columbia.edu with HTTP; Sat, 25 Sep 2004 10:48:11 -0400 (EDT) Message-ID: <1103.24.243.189.238.1096123691.squirrel@webmail.cs.columbia.edu> Date: Sat, 25 Sep 2004 10:48:11 -0400 (EDT) From: mre2007@cs.columbia.edu To: freebsd-smp@freebsd.org User-Agent: SquirrelMail/1.4.2 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 Importance: Normal X-PMX-Version: 4.7.0.111621, Antispam-Engine: 2.0.1.0, Antispam-Data: 2004.9.25.0 X-PerlMx-Spam: Gauge=X, Probability=10%, Report='PRIORITY_NO_NAME 0.716, NO_REAL_NAME 0, __CT 0, __CTE 0, __CT_TEXT_PLAIN 0, __HAS_MSGID 0, __HAS_X_PRIORITY 0, __MIME_VERSION 0, __SANE_MSGID 0' Subject: "Kernel Hacking"/Developing on a HT CPU versus "physical" CPUs X-BeenThere: freebsd-smp@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: FreeBSD SMP implementation group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Sep 2004 14:48:18 -0000 Hey, I was wondering if from a developing/"kernel hacking" standpoint, are hyperthreading and two "physical" CPUs any different? At what point do the differences have to be taken into consideration when working on the FreeBSD kernel/scheduler/etc? I'm looking to start contributing to the FreeBSD project and am trying to get some hardware set aside. Thanks! -Marc