2002-11-14 17:12:50

by Daniel Podlejski

[permalink] [raw]
Subject: Dell Poweredge 2600 SMP

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 ?

--
Daniel Podlejski <[email protected]>


2002-11-14 17:35:09

by Mikael Pettersson

[permalink] [raw]
Subject: Re: Dell Poweredge 2600 SMP

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...