Date: Mon, 25 Feb 2008 12:52:23 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-questions@freebsd.org Subject: Re: Dual core CPU's, but only 2 CPU's in-use? Message-ID: <fpua03$lnd$1@ger.gmane.org> In-Reply-To: <20080225223739.723d9e14@piglet> References: <20080224110010.GA4447@edward.lilypie.com> <47C1590F.3020605@bsdforen.de> <20080224230744.50539c03@piglet> <47C18665.9050600@FreeBSD.org> <20080225210134.2d0e2908@piglet> <47C298B5.7040907@FreeBSD.org> <20080225223739.723d9e14@piglet>
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[-- Attachment #1 --] Tigger wrote: > The only security advisory I could find was for 5.x and contained info > on how to disable, not enable. > > http://security.freebsd.org/advisories/FreeBSD-SA-05:09.htt.asc It's the same security issue, but it's handled differently on 5.x since it's old. See machdep.hyperthreading_allowed sysctl. Also, try benchmarking the system with and without hyperthreading (on the real work the machine will be doing) since in some cases turning on hyperthreading will result in globally lower performance. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHwqv3ldnAQVacBcgRAvGkAKDjadPOEyfJpVoZkGCRFHv9epwKtgCcCO4g acwhJNmKx4stWus5cIsuPa4= =NUij -----END PGP SIGNATURE-----
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