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Date: Thu, 26 May 2011 13:39:19 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Patrick Lamaiziere <patfbsd@davenulle.org>
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Cc: freebsd-stable@FreeBSD.org
Subject: Re: [poll] hyperthreading_allowed, hlt_logical_cpus, mp_watchdog
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on 25/05/2011 20:13 Patrick Lamaiziere said the following:
> 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?.

Yes, the issue hasn't magically disappeared.

-- 
Andriy Gapon