From owner-freebsd-hackers Wed Sep 11 10: 9:37 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id AB78237B43F for ; Wed, 11 Sep 2002 10:09:15 -0700 (PDT) Received: from mail.speakeasy.net (mail12.speakeasy.net [216.254.0.212]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4712243E3B for ; Wed, 11 Sep 2002 10:09:15 -0700 (PDT) (envelope-from jhb@FreeBSD.org) Received: (qmail 6856 invoked from network); 11 Sep 2002 17:09:14 -0000 Received: from unknown (HELO server.baldwin.cx) ([216.27.160.63]) (envelope-sender ) by mail12.speakeasy.net (qmail-ldap-1.03) with DES-CBC3-SHA encrypted SMTP for ; 11 Sep 2002 17:09:14 -0000 Received: from laptop.baldwin.cx (gw1.twc.weather.com [216.133.140.1]) by server.baldwin.cx (8.12.5/8.12.5) with ESMTP id g8BH9DBv035515; Wed, 11 Sep 2002 13:09:13 -0400 (EDT) (envelope-from jhb@FreeBSD.org) Message-ID: X-Mailer: XFMail 1.5.2 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <20020910190709.T70034-100000@carver.gumbysoft.com> Date: Wed, 11 Sep 2002 13:09:14 -0400 (EDT) From: John Baldwin To: Doug White Subject: Re: Dell 2650 SMP perf question Cc: freebsd-hackers@freebsd.org, hackers@d.sparks.net Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On 11-Sep-2002 Doug White wrote: > Random notes: > > On Tue, 10 Sep 2002 hackers@d.sparks.net wrote: > >> Hyperthreading is turned off, I believe. There aren't any >> "hyperthreading" swithes in the bios I could find, but the "logical >> processor" option is turned off. > > HyperThreading is not supported on FreeBSD at current. It requires some > ACPI work which hasn't happened yet. Not quite. It depends on the BIOS. Some BIOS's include logical CPU's in the mptable, in which case FreeBSD will work with them fine. Some only include logical CPU's in the APIC MADT which FreeBSD doesn't yet use on i386 (we use it on ia64 and will eventually use it on i386 as we need it for ACPI interrupt routing on SMP.) -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message