6.2-RELEASE does not use second CPU on pentium D

[Oliver Fromme]

Alex Povolotsky wrote:
 > I have a Pentium D box, running 6.2-RELEASE. In dmesg, I see CPU#1 
 > launched, but I never see any process running on it, and mptable shows

Hyperthreading is disabled by default in FreeBSD (for
security reasons).  You can enable it via sysctl if
you want (machdep.hyperthreading_allowed=1).

However, note that it might not make your machine any
faster (in fact, a UP kernel might be faster; it depends
on the kind of programs that you're running).  Also
not that there is a potential security issue with hyper-
threading (information leak).

Best regards
   Oliver

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