Kernel forces machdep.hlt_cpus, how to change?

[Colin Percival]

Walter Hop wrote:
> I'm  testing  out  FreeBSD  6.0R  on  a  Dual  Xeon. I want to do some
> benchmarking  of hyperthreading before I put this machine into use, so
> I am trying to turn off the HLTing of logical cpu's.

Read FreeBSD-SA-05:09.htt :

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.htt.asc

and then, if you don't have any local untrusted users, consider setting
machdep.hyperthreading_allowed=1 in /boot/loader.conf.

Colin Percival