Date: Sun, 18 Nov 2007 12:50:29 +0200 From: Manolis Kiagias <sonicy@otenet.gr> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-questions@freebsd.org Subject: Re: hyperthreading CPU and broken scheduling? Message-ID: <474018F5.6080208@otenet.gr> In-Reply-To: <20071118114306.H4761@wojtek.tensor.gdynia.pl> References: <20071118111446.H4507@wojtek.tensor.gdynia.pl> <4740140C.6050103@otenet.gr> <20071118114306.H4761@wojtek.tensor.gdynia.pl>
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Wojciech Puchar wrote: >>> http://lists.freebsd.org/mailman/listinfo/freebsd-questions >>> To unsubscribe, send any mail to >>> "freebsd-questions-unsubscribe@freebsd.org" >>> >>> >> To enable hyperthreading, try setting the following in /etc/sysctl.conf: >> >> machdep.hyperthreading_allowed=1 >> >> and reboot (or execute sysctl machdep.hyperthreading_allowed=1 by hand). > did /etc/rc.d/sysctl start and works. > > quite strange that FreeBSD disables hyperthreading at start. > > IIRC there has been some discussion about possible vulnerabilities when hyperthreading is enabled. If you google around you will find it.help
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