linux-kernel - Re: Intel Core Duo/Duo2 T2300/E6400 - Hyper-Threading (the absence of)

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Message-ID: <20070108100151.GK29911@devserv.devel.redhat.com>
Date:	Mon, 8 Jan 2007 05:01:51 -0500
From:	Jakub Jelinek <jakub@...hat.com>
To:	linux-kernel@...r.kernel.org, robbat2@...too.org
Subject: Re: Intel Core Duo/Duo2 T2300/E6400 - Hyper-Threading (the absence of)

On Mon, Jan 08, 2007 at 01:44:32AM -0800, Robin H. Johnson wrote:
> (Please CC me, I am not subscribed to LKML [I have set the
> Mail-Followup-To header accordingly]).
> 
> On two of my new machines, with Intel Core Duo T2300 and Core2 Duo E6400
> chips respectively, I noticed some weirdness in how many CPUs are
> present. 
> 
> If the hyper-threading bit is present in the CPU info, should there
> always be a an extra CPU presented to the system per physical core?

No.  The ht flag just says whether HT reporting via CPUID is supported.
Core2 Duo E6400 is AFAIK not hyper-threaded, you just have 2 real sibling
CPUs (except that they share L2 cache).

	Jakub
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