Tigger wrote: > The only security advisory I could find was for 5.x and contained info > on how to disable, not enable. > > http://security.freebsd.org/advisories/FreeBSD-SA-05:09.htt.asc
It's the same security issue, but it's handled differently on 5.x since it's old. See machdep.hyperthreading_allowed sysctl. Also, try benchmarking the system with and without hyperthreading (on the real work the machine will be doing) since in some cases turning on hyperthreading will result in globally lower performance.
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