From owner-freebsd-smp Fri Jun 28 14:52:35 2002 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 D08D537B400; Fri, 28 Jun 2002 14:52:25 -0700 (PDT) Received: from great4.greatschools.net (great4.greatschools.net [199.4.104.154]) by mx1.FreeBSD.org (Postfix) with ESMTP id E84A743E18; Fri, 28 Jun 2002 14:52:14 -0700 (PDT) (envelope-from jdd@greatschools.net) Received: from dh8.office.greatschools.net (dh8.office.greatschools.net [199.4.104.139]) by great4.greatschools.net (8.11.3/8.11.6) with ESMTP id g5SLqEv19677; Fri, 28 Jun 2002 14:52:14 -0700 (PDT) (envelope-from jdd@greatschools.net) Date: Fri, 28 Jun 2002 14:52:15 -0700 (PDT) From: John David Duncan X-X-Sender: jdd@dh8.office.greatschools.net To: freebsd-smp@freebsd.org, Subject: 2 xeons = 4 CPUs? Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Hey, I just installed 4.6-RELEASE on a dual 1.8Mhz Xeon + Tyan S2720 motherboard (a Relion 140 server from Penguin Computing, actually). When I reboot with an SMP kernel, I see: CPU: Pentium 4 (2199.76-Mhz 686-class CPU) CPU: Pentium 4 (2199.76-Mhz 686-class CPU) CPU: Pentium 4 (2199.76-Mhz 686-class CPU) CPU: Pentium 4 (2199.76-Mhz 686-class CPU) SMP: AP CPU #1 Launched! SMP: AP CPU #2 Launched! SMP: AP CPU #3 Launched! That's twice as many CPUs as I think I have, each going 400Mhz faster. Is this safe? Correct? Is it that hyperthreading stuff? Should I disable it? Thanks - JD To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message