Marc G. Fournier wrote:
In 4.x, it was a 'shut it off' sort of deal .. my new amd64 don't appear
to have it enabled, but my older i386 server that I just upgraded to 6.x
does:
user pid %cpu %mem vsz rss tt state start time command
root 14 104.0 0.0 0 8 ?? RL 11:38AM 0:55.02 [idle:
cpu0]
root 11 99.1 0.0 0 8 ?? RL 11:38AM 0:00.00 [idle:
cpu3]
root 13 99.1 0.0 0 8 ?? RL 11:38AM 0:00.00 [idle:
cpu1]
root 12 98.0 0.0 0 8 ?? RL 11:38AM 0:54.54 [idle:
cpu2]
Is it still something that I should disable, and, if so, how in 6.x?
According to the 6.0 i386 Release Notes, you should use the
machdep.hyperthreading_allowed sysctl to disable Hyper-Threading.
If you are concerned with security, you should disable it. If you are
more concerned with performance, you should test your workload
with/without Hyper-Threading and choose the configuration which performs
best.
-Jonathan
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