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Re: [dmidecode] Detecting dual-core processor

From: Jean Delvare
Subject: Re: [dmidecode] Detecting dual-core processor
Date: Mon, 12 Feb 2007 14:09:11 +0100

Hi Giulio,

On Thu, 19 Oct 2006 12:47:54 +0200, Giulio Orsero wrote:
> Linux 2.4
> How, if possible, to detect whether the running processor is a dual-core one
> using dmidecode?  

The processor information in the DMI table relates to the physical
processors, and there is no flag to differenciate multi-core ones.
There is a flag to tell whether a processor supports hyper-threading

You may use the processor family and/or signature, if these are
properly filled, to find out whether the processor is a multi-core one,
but you'll have to compare the values with the manufacturer
documentation by yourself.

> If there is a way to do it, does it depend (the detection) on the system
> running an smp kernel?

No, the DMI table is written by the BIOS before the OS is even started.

> Cannot look at /proc/cpuinfo since kernel 2.4 doesn't show the number of
> cores.

Jean Delvare

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