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Date: Wed, 25 May 2011 19:13:14 +0200
From: Patrick Lamaiziere <patfbsd@davenulle.org>
To: freebsd-stable@FreeBSD.org
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Cc: Andriy Gapon <avg@FreeBSD.org>
Subject: Re: [poll] hyperthreading_allowed, hlt_logical_cpus, mp_watchdog
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Le Tue, 24 May 2011 16:21:08 +0300,
Andriy Gapon <avg@FreeBSD.org> a écrit :

Hello,
 
> I am planning on some changes in head and would like to see if people
> use the following features:
> - machdep.hyperthreading_allowed tunable and sysctl

If I remember well, these tunables were introduced because the
paper of Colin Percival about the HTT security flaw on intel
processors :
http://www.daemonology.net/hyperthreading-considered-harmful/

http://security.freebsd.org/advisories/FreeBSD-SA-05:09.htt.asc

I guess this is still a concern?.

Best regards.