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From: "Paul Dufresne" <dufresnep@fastmail.fm>
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Date: Fri, 27 May 2005 15:57:38 -0400
Subject: Re: Problem with HT support in 5.4
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> > Oh, wait, it is probably just the last HT security patch,
> > ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.htt.asc.
> 
> hmm... So basically, SMP can be enabled, but it won't use
>HT even if it sees a capable processor? 

Not sure but after reading:
<NOTE:  For users that are certain that their environment is
not affected by this vulnerability, such as single-user systems,
Hyper-Threading Technology may be re-enabled by setting the
tunable "machdep.hyperthreading_allowed". >
I whould try:
# echo "machdep.hyperthreading_allowed=1" >> /boot/loader.conf

but I am a newbie to FreeBSD using a Pentium II, and indeed
the only user -I hope- of my system.

--Paul