linux-kernel - Re: How to detect multi-core and/or HT-enabled CPUs in 2.4.x and 2.6.x kernels

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Message-ID: <20061227115854.C23645@unix-os.sc.intel.com>
Date:	Wed, 27 Dec 2006 11:58:55 -0800
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Martin Knoblauch <knobi@...bisoft.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to detect multi-core and/or HT-enabled CPUs in 2.4.x and 2.6.x kernels

On Wed, Dec 27, 2006 at 09:52:02AM -0800, Martin Knoblauch wrote:
>  For sizing purposes, doing benchmarks is the only way. For the purpose
> of Ganglia the sockets/cores/threads info is purely for inventory. And
> we are likely going to add the new information to our metrics.
> 
>  But - we still need to find a way to extract the infor :-)

Only the 2.4 x86_64 kernels are exporting limited info("physical id",
"siblings") through /proc/cpuinfo.

Some of the distos based on 2.4 kernels have the complete topology
(physical id, core id, cpu cores, siblings) exported through /proc/cpuinfo.

thanks,
suresh
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