FreeBSD now has rudimentary support for HyperThreading (HTT). SMP kernels with the HTT kernel option will detect and start up the logical processors on HTT-capable machines. The logical processors will be treated like additional physical processors for the purposes of process scheduling.
On the 4.7 deployment systems I am running I have dual Xeon CPUs with hyperthreading. They appear as 4 CPUs in 'top'. That would seems to indicate to me that FreeBSD is scheduling them as four separate processors, however the note from:
http://www.freebsd.org/relnotes/4-STABLE/relnotes/i386/x19.html#KERNEL
makes it seem like this is a new 4.8 feature. Should I be concerned about upgrading when 4.8 is released in order to obtain the benefits of better use of these CPUs?
Ari Maniatis
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