From owner-freebsd-smp  Fri Jun 28 15: 2:46 2002
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Date: Fri, 28 Jun 2002 18:02:04 -0400 (EDT)
From: "Andrew R. Reiter" <arr@watson.org>
To: John David Duncan <jdd@greatschools.net>
Cc: freebsd-smp@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG
Subject: Re: 2 xeons = 4 CPUs?
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On Fri, 28 Jun 2002, John David Duncan wrote:

: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?

You're seeing HT support in action.

--
Andrew R. Reiter
arr@watson.org
arr@FreeBSD.org


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