Top only showing one active CPU on HTT system

Tim Kellers kellers at njit.edu
Tue May 24 10:44:27 PDT 2005


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.


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