Theres no specific kernel option for HT, but the SMP option is HT aware.
In my 2.6.8.1 kernel it has under smp support, so it might be a new thing.
CONFIG_SMP=y
CONFIG_NR_CPUS=8
CONFIG_SCHED_SMT=y <= "Hyperthreading scheduler support" in make menuconfig
A little googling told me a P4 with hyperthreading is a SMT processor. ( simultaneous multithreading )
Col.
