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Date:      Sun, 27 Apr 2003 19:35:39 +0100
From:      Peter Wood <peter@alastria.net>
To:        freebsd-smp@freebsd.org
Subject:   machdep.cpu_idle_hlt on a Dual AMD 2000+ MP
Message-ID:  <af8oav4h43rd549afuusneuo6qle7vjrnm@4ax.com>

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Afternoon,

I was reading all the threads regarding hyperthreading, and descovered =
that
machdep.cpu_idle_hlt is set to 0 by default on SMP machines and 1 on
uniprocessor machines.

I've change it to 1 on my dual machine, and so far it appears stable. I =
have
noticed that the CPU tempratures appear to be lower now, possibly a
coincidence as the servers load may have been changing. Should I expect =
it to
be lower?

Also should I expect to see any performance loss, or instability? Does =
anyone
know the original reason for setting the defaults this way?

Just curious,

Have a good one,

Peter.
--=20
Peter Wood <peter@alastria.net> :: Tel +44 7974 799440



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