Date: Thu, 26 May 2011 13:39:19 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Patrick Lamaiziere <patfbsd@davenulle.org> Cc: freebsd-stable@FreeBSD.org Subject: Re: [poll] hyperthreading_allowed, hlt_logical_cpus, mp_watchdog Message-ID: <4DDE2DD7.8090908@FreeBSD.org> In-Reply-To: <20110525191314.62d5f7f5@davenulle.org> References: <4DDBB0C4.5010109@FreeBSD.org> <20110525191314.62d5f7f5@davenulle.org>
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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
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