Date: Wed, 30 Aug 2006 14:43:51 -0700 From: Skylar Thompson <skylar@cs.earlham.edu> To: Jordi Carrillo <jordilin@gmail.com> Cc: backyard1454-bsd@yahoo.com, freebsd-questions@freebsd.org Subject: Re: SMP detection Message-ID: <44F60697.5060407@cs.earlham.edu> In-Reply-To: <94ff3700608301437u4ea3280ama8a9cfda3edfda08@mail.gmail.com> References: <94ff3700608301020l34251166nbdb4d72842e1bb86@mail.gmail.com> <20060830181240.65785.qmail@web83106.mail.mud.yahoo.com> <94ff3700608301302n13f9aabcs935fbe6403601d30@mail.gmail.com> <44F6036E.7050203@cs.earlham.edu> <94ff3700608301437u4ea3280ama8a9cfda3edfda08@mail.gmail.com>
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Jordi Carrillo wrote:
> Skylar,
> So, 50% is used for processes and the other 50% to handle hardware
> interrupts. Is that right?
>
I believe so, but the blurb that I read that in is from 2003. There's a
good chance someone will jump in to correct me. :)
It was in /usr/src/UPDATING:
20031022:
Support for HyperThread logical CPUs has now been enabled by
default. As a result, the HTT kernel option no longer exists.
Instead, the logical CPUs are always started so that they can
handle interrupts. However, the extra logical CPUs are prevented
from executing user processes by default. To enable the logical
CPUs, change the value of the machdep.hlt_logical_cpus from 1 to
0. This value can also be set from the loader as a tunable of
the same name.
--=20
-- Skylar Thompson (skylar@cs.earlham.edu)
-- http://www.cs.earlham.edu/~skylar/
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