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Date: Mon, 26 Apr 2010 12:59:19 +0300
From: oklahoma <stopeme@gmail.com>
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To: Hubert Tournier <hubert@frbsd.org>, freebsd-smp@freebsd.org
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Subject: Re: Disabling HyperThreading?
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Hubert Tournier wrote:
>
> I forgot to specify that the system is a remote dedicated server, for which
> i have no physical access.
>
> I could rent a virtual KVM in order to try to access its BIOS settings, but
> i'm not sure this would work.
>
> Any other software solution?
if the server is dedicated entirely to you, ask your colo support to 
disable it for you.
other thing i find was

machdep.hlt_cpus 

is suppose to tell the scheduler that there is extra cores but not to use them.
try to enable and see with top is there app that use logical cores.