From owner-freebsd-stable@FreeBSD.ORG  Fri May  2 20:31:21 2003
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 21B4837B401
	for <freebsd-stable@freebsd.org>;
	Fri,  2 May 2003 20:31:21 -0700 (PDT)
Received: from mocha.cable.nu (CPE-144-132-13-112.vic.bigpond.net.au
	[144.132.13.112])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 5EC6743FBF
	for <freebsd-stable@freebsd.org>;
	Fri,  2 May 2003 20:31:19 -0700 (PDT)
	(envelope-from joynt@bigpond.net.au)
Received: from mocha.cable.nu (localhost [127.0.0.1])
	by mocha.cable.nu (8.12.8p1/8.12.8) with ESMTP id h433WPT7007993
	for <freebsd-stable@freebsd.org>; Sat, 3 May 2003 13:32:26 +1000 (EST)
	(envelope-from joynt@bigpond.net.au)
Received: from localhost (joynt@localhost)h433WPOT007990
	for <freebsd-stable@freebsd.org>;
	Sat, 3 May 2003 13:32:25 +1000 (EST)
X-Authentication-Warning: mocha.cable.nu: joynt owned process doing -bs
Date: Sat, 3 May 2003 13:32:25 +1000 (EST)
From: Steve Joynt <joynt@bigpond.net.au>
X-X-Sender: joynt@mocha.cable.nu
To: freebsd-stable@freebsd.org
Message-ID: <20030503132725.D7983@mocha.cable.nu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Subject: Hyperthreading in non-SMP systems
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Production branch of FreeBSD source code
	<freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 03 May 2003 03:31:21 -0000

Hi,

Is it possible to have Hyperthreading enabled in non-SMP systems? According
to LINT the HTT option requires SMP and APIC_IO, but when I include both of
those in my P4 3.06GHz system it panics on startup with:

panic: pmap_bootstrap: no local apic!
mp_lock = 0000000c; cpuid = 0; lapic.id = 00000000

I have hyperthreading enabled in the bios, and when booting with a standard
kernel I get the following:

CPU: Intel(R) Pentium(R) 4 CPU 3.06GHz (3073.65-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf27  Stepping = 7
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs

but there's no further messages about enabling both cpus. Does this mean
that HTT is only supported on systems with have multiple (physical) cpus?

thanks,
- Steve