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Date: Fri, 27 Nov 2009 01:33:17 +0200
From: Manolis Kiagias <sonicy@otenet.gr>
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To: Brett Glass <brett@lariat.net>
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Cc: questions@freebsd.org
Subject: Re: FreeBSD 8.0 and Atheros AzureWave wireless chipset
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Brett Glass wrote:
>
> However, the machine still boots. And hyperthreading is enabled,
> because the Atom has HTT. (I have been thinking of disabling it,
> because hyperthreading may not work very well on the Atom. Does anyone
> know how to do this properly? I tried setting machdep.hlt_logical_cpus
> to 1 in /boot/loader.conf and was rewarded with a system crash at boot
> time.)
>

In /boot/loader.conf try:

machdep.hyperthreading_allowed=0

Though it seems hyperthreading is improved on the Atom and there is no
penalty for leaving it on.