no hyperthreading in FreeBSD 9?

Mark Blackman mark at
Fri Jan 13 16:48:24 UTC 2012

On 13 Jan 2012, at 16:30, Marco Beishuizen wrote:

> Hi,
> I just upgraded from 8-STABLE to 9-STABLE on my dual Xeon (nocona). Now I have in my boot messages:
> ...
> root: /etc/rc.d/sysctl: WARNING: sysctl machdep.hlt_logical_cpus does not exist.
> root: /etc/rc.d/sysctl: WARNING: sysctl machdep.hyperthreading_allowed does not exist.
> ...
> So isn't hyperthreading not available anymore in FreeBSD 9?

Seems to imply HT is enabled by default and new sysctls are used to take 
logical CPUs offline.

How many CPUs does your boot message suggest FreeBSD 9 is reporting?

- Mark

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