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From: Tim Kellers <kellers@njit.edu>
Organization: CPE at NJIT
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Date: Tue, 24 May 2005 13:43:56 -0400
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Subject: Re: Top only showing one active CPU on HTT system
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On Tuesday 24 May 2005 01:00 pm, Kirk Strauser wrote:
> On Tuesday 24 May 2005 10:59, Tim Kellers wrote:
> > The acpi_load="YES" in /boot/loader.conf might do the trick.
>
> Actually, it turns out that I have to set machdep.hyperthreading_allowed=1
> for HTT to work now.
>
> Speaking of which, is that tunable documented anywhere besides the HTT
> security PR?  It's not in the 5.4-STABLE /usr/src/UPDATING or anyplace else
> I've looked, so I was more than a bit surprised to find that such an
> important default was changed without much notice.  I imagine a lot of
> people read the PR much as I did: "blah, blah, theoretical, doesn't affect
> me, next message"...

I even read the SA and it managed to completely pass through my head without 
hitting one brain cell.