From owner-freebsd-hardware@FreeBSD.ORG Thu Oct 2 10:10:16 2003 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C6C2F16A4B3 for ; Thu, 2 Oct 2003 10:10:16 -0700 (PDT) Received: from avscan1.sentex.ca (avscan1.sentex.ca [199.212.134.11]) by mx1.FreeBSD.org (Postfix) with ESMTP id E883243F93 for ; Thu, 2 Oct 2003 10:10:14 -0700 (PDT) (envelope-from damian@sentex.net) Received: from lava.sentex.ca (pyroxene.sentex.ca [199.212.134.18]) by avscan1.sentex.ca (8.12.9p2/8.12.9) with ESMTP id h92HAEl7018347 for ; Thu, 2 Oct 2003 13:10:14 -0400 (EDT) (envelope-from damian@sentex.net) Received: from pegmatite.sentex.ca (pegmatite.sentex.ca [192.168.42.92]) by lava.sentex.ca (8.12.9p1/8.12.9) with ESMTP id h92HAEdJ092650 for ; Thu, 2 Oct 2003 13:10:14 -0400 (EDT) (envelope-from damian@sentex.net) Received: by pegmatite.sentex.ca (Postfix, from userid 1001) id E8715170F3; Thu, 2 Oct 2003 13:09:52 -0400 (EDT) Date: Thu, 2 Oct 2003 13:09:52 -0400 From: Damian Gerow To: hardware@freebsd.org Message-ID: <20031002170952.GF15256@sentex.net> References: <200310021105.10872.john@johnrshannon.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200310021105.10872.john@johnrshannon.com> X-GPG-Key-Id: 0xB841F142 X-GPG-Fingerprint: C7C1 E1D1 EC06 7C86 AF7C 57E6 173D 9CF6 B841 F142 X-Habeas-SWE-1: winter into spring X-Habeas-SWE-2: brightly anticipated X-Habeas-SWE-3: like Habeas SWE (tm) X-Habeas-SWE-4: Copyright 2002 Habeas (tm) X-Habeas-SWE-5: Sender Warranted Email (SWE) (tm). The sender of this X-Habeas-SWE-6: email in exchange for a license for this Habeas X-Habeas-SWE-7: warrant mark warrants that this is a Habeas Compliant X-Habeas-SWE-8: Message (HCM) and not spam. Please report use of this X-Habeas-SWE-9: mark in spam to . User-Agent: Mutt/1.5.4i X-Virus-Scanned: by Sentex Communications (avscan1/20021227) Subject: Re: Hyperthreading Kernel Configuration - 5.1 X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 02 Oct 2003 17:10:16 -0000 Thus spake John R. Shannon (john@johnrshannon.com) [02/10/03 13:05]: > On a new computer, dmesg shows: > > CPU: Intel(R) Pentium(R) 4 CPU 2.80GHz (2793.01-MHz 686-class CPU) > Origin = "GenuineIntel" Id = 0xf29 Stepping = 9 > Features=0xbfebfbff > Hyperthreading: 2 logical CPUs > acpi_cpu0: port 0x530-0x537 on acpi0 > acpi_cpu1: port 0x530-0x537 on acpi0 > > Should options SMP and APIC_IO be enabled in kernel? In short: yes. And then you need to look at the machdep.* sysctl nobs, there's one you need to enable in there (I've forgotten which one). But that leads me to a secondary question: is enabling HTT really worth the time? I know that people have said that using HTT can actually make your system slower -- is this an implementation issue, or did Intel really release something that degrades performance?