HTT on single CPU?

John Baldwin jhb at
Wed Jul 9 08:38:24 PDT 2003

On 09-Jul-2003 Jens Rehsack wrote:
> Andrey Chernov wrote:
>> On Tue, Jul 08, 2003 at 13:13:44 -0400, John Baldwin wrote:
>>>You need to enable SMP and APIC_IO in your kernel to use HTT.  Also,
>>>the BIOS setting probably won't make a difference.
>> I have both APIC and HTT flags in my P4, but when I try to load kernel
>> compiled with APIC_IO and SMP, I got panic:
>> pmap_bootstrap: no local apic! (non-SMP hardware?)
>> Is it motherboard or BIOS? I have no Hyperthreading setting in the BIOS,
>> but PIC or APIC modes (both not works with MP kernel). Motherboard is ASUS 
>> P4B533.
> Hm, I get a really other behaviour, but the result is no having two cpu's:

Your CPU does not support HTT.  Note the lack of a 'Hyperthreading: 2 logical CPUs'
line in your dmesg output after the Features= line.


John Baldwin <jhb at>  <><
"Power Users Use the Power to Serve!"  -

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