Top only showing one active CPU on HTT system

Kirk Strauser kirk at strauser.com
Tue May 24 10:01:09 PDT 2005


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"...
-- 
Kirk Strauser
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