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From: Mikael Pettersson <mikpe@csd.uu.se>
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Date: Thu, 14 Nov 2002 18:41:55 +0100
To: Daniel Podlejski <underley@underley.eu.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Dell Poweredge 2600 SMP
In-Reply-To: <20021114171431.GA22647@witch.underley.eu.org>
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Daniel Podlejski writes:
 > Any ideas why Linux 2.4.19, 2.4.20-rc1 and -rc1-ac1 with megaraid
 > driver from http://www.domsch.com/linux/megaraid/ detects four CPUs,
 > when olny two are on board ?

Because
1) it has two hyperthreaded Xeon processors, each of which contains
   two logical CPUs, and
2) you didn't disable hyperthreading in the BIOS.

Sigh. This is becoming a FAQ...
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