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

From: Jakub Jelinek <jakub@xxxxxxxxxx>
Date: Mon, 8 Jan 2007 05:01:51 -0500

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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References:
- Intel Core Duo/Duo2 T2300/E6400 - Hyper-Threading (the absence of)
  - From: Robin H. Johnson

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