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Date: Sun, 18 Nov 2007 11:43:42 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Manolis Kiagias <sonicy@otenet.gr>
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Cc: freebsd-questions@freebsd.org
Subject: Re: hyperthreading CPU and broken scheduling?
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>> 
> To enable hyperthreading, try setting the following in /etc/sysctl.conf:
>
> machdep.hyperthreading_allowed=1
>
> and reboot (or execute sysctl machdep.hyperthreading_allowed=1 by hand).
did /etc/rc.d/sysctl start  and works.

quite strange that FreeBSD disables hyperthreading at start.