Status of hyperthreading in FreeBSD

Sam Fourman Jr. sfourman at
Sun Dec 21 23:26:55 UTC 2008

> as far as i know, just enabling smp will allow ht to function. also, i don't
> know if intel changed ht in the new atom processor, they could have.
is FreeBSD's smp special in some way that it would be the exception to
the following statement.
I know there was a lot of changes made in the new ULE2 scheduler maybe
that is why?

Hyper-threading relies on support in the operating system as well as
the CPU. Conventional multiprocessor support is not enough to take
advantage of hyper-threading.[1] For example, even though Windows 2000
supports multiple CPUs, Intel does not recommend that hyper-threading
be enabled under that operating system.

I found this in wikipedia at the following link

Sam Fourman Jr.
Fourman Networks

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