How would I turn that off? In the kernel config? Not too familiar with
that. I have a 2 proc xeon with 4 gigs of mem on the way for postgres,
so I hope HT isn't a problem. If HT is turned off, does it just not
use the other "half" of the processor? Or does the processor just work
as one unit?
You turn it off in the BIOS. There is no 'other half', the processor is
just pretending to have two cores by shuffling registers around, which
gives maybe a 5-10% performance gain in certain multithreaded
situations. <opinion>A hack to overcome marchitactural limitations due
to the overly long pipeline in the Prescott core.</opinion>. Really of
most use for desktop interactivity rather than actual throughput.
M
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