HTT on single CPU?

Larry Rosenman ler at
Wed Jul 9 13:29:55 PDT 2003

--On Wednesday, July 09, 2003 22:25:38 +0200 Jens Rehsack 
<rehsack at> wrote:

> Brooks Davis wrote:
>> P4's below ~3.1GHz do not actually provide logical CPU support.
> That's not true. German distributors sell P4 CPU's FSB 800
> (starting at 2.4GHz) which supports HTT.
> I know, that BSD didn't found 2 logical CPU's as John remarked,
> but I didn't understood why the CPU has the feature for HTT but
> no additional logical CPU's?
ALL P-4's have the Feature Bit set, just not all of them have
bits 23-16 of %ebx set to something greater than 1 on a cpuid instruction
with %eax = 1.

Larry Rosenman           
Phone: +1 972-414-9812                 E-Mail: ler at
US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749

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