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From: Andriy Tkachuk <ant@emict.com>
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Date: Thu, 16 Dec 2004 13:11:10 +0200
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Subject: doc's inaccuracy? about machdep.hlt_logical_cpus
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Hi folks.

ant# uname -r
5.3-STABLE

man smp
...
     FreeBSD supports hyperthreading on Intel CPU's on the i386 platform.
     Since using logical CPUs can cause performance penalties under certain
     loads, the logical CPUs can be disabled by setting the
     machdep.hlt_logical_cpus sysctl to one.
     ^^^^^^^^^^^^^^^^^^^^^^^^

ant# sysctl -a | grep machdep.hlt
machdep.hlt_cpus: 0

is this the one that is mentioned in smp(4) ?