Re: SMP detection
- From: Skylar Thompson <skylar@xxxxxxxxxxxxxx>
- Date: Wed, 30 Aug 2006 10:46:54 -0700
Jordi Carrillo wrote:
I've read that SMP should be disabled for performance issues (I didI believe that HTT was disabled in FreeBSD per security report
not know
that before installing freebsd). I have a P4 3GHz with hyperthreading
technology. I have the SMP-GENERIC kernel and it only launches one
cpu. So,
I've decided to disable SMP from BIOS. Is that ok?, knowing that I have a
Smp enabled kernel? or should I install one without smp? If so, is
there a
way to install one already precompiled?
Thanks in advance
FreeBSD-SA-05:09.htt
(http://security.freebsd.org/advisories/FreeBSD-SA-05:09.htt.asc). If
you want to enable, I believe you can set the loader.conf option
machdep.hlt_logical_cpus to 2.
Having SMP enabled on a uniprocessor box shouldn't give you any
stability problems, but SMP does use a different locking mechanism that
can affect performance. You will probably get slightly better
performance if you run with an SMP-disabled kernel.
--
-- Skylar Thompson (skylar@xxxxxxxxxxxxxx)
-- http://www.cs.earlham.edu/~skylar/
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