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Date:      Thu, 05 Jan 2006 09:47:35 -0800
From:      Colin Percival <cperciva@freebsd.org>
To:        Walter Hop <freebsd@walter.transip.nl>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Kernel forces machdep.hlt_cpus, how to change?
Message-ID:  <43BD5BB7.9050508@freebsd.org>
In-Reply-To: <60578543.20060105183452@lifeforms.nl>
References:  <60578543.20060105183452@lifeforms.nl>

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Walter Hop wrote:
> I'm  testing  out  FreeBSD  6.0R  on  a  Dual  Xeon. I want to do some
> benchmarking  of hyperthreading before I put this machine into use, so
> I am trying to turn off the HLTing of logical cpu's.

Read FreeBSD-SA-05:09.htt :

ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:09.htt.asc

and then, if you don't have any local untrusted users, consider setting
machdep.hyperthreading_allowed=1 in /boot/loader.conf.

Colin Percival



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