On 09/04/12 18:01, Ryan Stone wrote:
I have a Intel Sandy Bridge system that reports that it has SMT cores
instead of HTT(under a derivative of FreeBSD 8.2). I'll admit that I
don't at all understand the distinction between the two -- I thought
that HTT was just Intel's name for SMT. In any case, is there any
reason that machdep.hyperthreading_allowed should not apply to SMT
cores, too?
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No, HTT is a half core. It will speed up a system round about 20%, but
only when it can work with HTT.
HTT is the idea to work on the last thing while new data will transfer
from ram to cpu cache.
Else the cpu wlll idle and doing nothing.
Problem is to use htt on a heavy loaded system. Since Win7 Microsoft use
it on a good way. Bevor this, they make a mistake to use it as a normale
core. Under Vista cpu 0 is under heavy load they put it to cpu 1, but
this was only a htt core.
On a dualcore core 2 must use, bevor core 1 (htt) is used. This it is,
what MS change.
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