Pee Four HyperThreading to show 2 cpu in /proc/cpuinfo?

I've have Mandrake 9. 1 installed on my Abit IS7-E motherboard with a Pee Four 2. 4c with Hyerthreading enabled in Bios. Kernel version is 2. 4. 21-0. 13mdk. I've since installed & boot to 2. 3. 21-0.

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I've have Mandrake 9.1 installed on my Abit IS7-E motherboard with a
Pee Four 2.4c with Hyerthreading enabled in Bios. Kernel version is
2.4.21-0.13mdk. I've since installed & boot to 2.3.21-0.13mdksmp
as well as appending 'acpismp=force' in lilo.conf.
 
However, despite all these, /proc/cpuinfo still just showing cpu:0 only.
HT flag is shown on processor features indicating Hyperthreadig processor
detected. How do I enable hyperthreading in this smp kernel? Please
advice.

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