Recently I've got a new PC: P4 Titan 2.6 GHz. It says in the brochure that it has "HyperThreading", which I think is somehow related to the HyperThread thing in the FreeBSD kernel, right?
I know there's this message in /usr/src/UPDATING, which unfortunately does not clear up the matter for me.
So let me recap what I believe to understand:
For utilizing the advantages of this HyperThreading stuff for users, I need in the kernel configuration: options SMP # Symmetric MultiProcessor Kernel options APIC_IO # Symmetric (APIC) I/O
Furthermore, I need to set "machdep.hlt_logical_cpus" to 0 (zero). How do I add this to "the loader" so that it is set to zero at every boot up? Should I simply add to my /boot/loader.conf a line like:
After that, I'm done with the hyperthreading?
PS: if you're in the mood, I would appreciate a few words on what this HyperThreading is about and what advantages I can expect. Thanks too!
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