sysctl debug.cpufreq.highest

[Alexander Kojevnikov]

Are there plans to add debug.cpufreq.highest support into CURRENT and
eventually into 8-STABLE?

Corresponding patches [0] have been available since Nov 2008 [1] and
they work pretty well.

This variable allows to underclock the CPU, which is useful when
building quiet or low-power systems.

[0] http://acm.poly.edu/~spawk/cpufreq/
[1] http://lists.freebsd.org/pipermail/freebsd-current/2008-November/000316.html