kernel 2.6.13.4 and HT (hyperthreading) problem??

Now I upgraded kernel on my server to 2.6.13.4 and I have problem, this kernel don`t see my P4 3GHz with HT (hyperthreading) support (only one cpu when I use TOP command), what I must do?

in .config for this kernel I have:[*] Symmetric multi-processing support [*] SMT (Hyperthreading) scheduler support

I must enable something more?

Thanks.

 

 

 

 

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