From owner-freebsd-current Fri Jan 31 12:58:59 2003 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 E9E8137B401 for ; Fri, 31 Jan 2003 12:58:57 -0800 (PST) Received: from mail.speakeasy.net (mail17.speakeasy.net [216.254.0.217]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5703643FC7 for ; Fri, 31 Jan 2003 12:58:57 -0800 (PST) (envelope-from jhb@FreeBSD.org) Received: (qmail 16649 invoked from network); 31 Jan 2003 20:59:03 -0000 Received: from unknown (HELO server.baldwin.cx) ([216.27.160.63]) (envelope-sender ) by mail17.speakeasy.net (qmail-ldap-1.03) with DES-CBC3-SHA encrypted SMTP for ; 31 Jan 2003 20:59:03 -0000 Received: from laptop.baldwin.cx (gw1.twc.weather.com [216.133.140.1]) by server.baldwin.cx (8.12.6/8.12.6) with ESMTP id h0VKwsUT072950; Fri, 31 Jan 2003 15:58:54 -0500 (EST) (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: Date: Fri, 31 Jan 2003 15:59:00 -0500 (EST) From: John Baldwin To: Julian Elischer Subject: Re: Hyperthreading and machdep.cpu_idle_hlt Cc: Matthew Dillon Cc: Matthew Dillon , Trish Lynch , freebsd-current@FreeBSD.ORG, "Daniel C. Sobral" Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On 31-Jan-2003 Julian Elischer wrote: > > > On Fri, 31 Jan 2003, John Baldwin wrote: > >> >> AT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,,ACC> >> >> >> >> It has HTT set but it's only a 1.2GHz box and I heard somewhere that only >> >> 2+ GHz P4's had hyperthreading. I noticed some MFCs to stable that >> >> suggested hyperthreading support but I do not know if full hyperthreading >> >> support has been MFCd yet or is intended to be MFCd to -stable. >> > >> > AFAIK, full hyperthreading support, as it is, has been merged to >> > -stable. It consists of a patch to recognize the virtual CPUs, so they >> > will be dealt with like any SMP system, as long as HTT is enabled on the >> > BIOS. >> >> Well, sort of. We have no way of knowing if it is off in the BIOS unless >> we use the ACPI tables to enumerate CPU's (which we don't), so turning it >> off in the BIOS won't turn it off in FreeBSD for the time being. :) >> > I have a 2,8GHz p4 here which has HTT and has a bios option for > > Interrupt mode: [APIC/PIC] > > I'm using APIC mode but an SMP (today's 4.x) kernel > panics imediatly saying it can;t find an APIC. You need to have an mptable for it to work. The mptable will only list one processor, but it still needs to be there. -- 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-current" in the body of the message