Date: Tue, 8 Jun 2004 16:45:12 -0500 From: Eugene Lee <list-freebsd@fsck.net> To: freebsd-questions@freebsd.org Subject: Re: Hyperthreading question Message-ID: <20040608214512.GH420@Dark-Age.local> In-Reply-To: <40C6153C.5040700@xwave.com> References: <40C6153C.5040700@xwave.com>
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On Tue, Jun 08, 2004 at 03:36:28PM -0400, Dwayne MacKinnon wrote: : : I'm upgrading some machines from 4.8-RELEASE to 4.10-RELEASE. The : machines in question are dual-processor xeon boxes. Now, my boss is : adamant in that he doesn't want hyperthreading enabled on the machines. : : In 4.8-RELEASE things were simple... I just didn't add the "options HTT" : line to my kernel config file. In 4.10-RELEASE though, HTT is enabled by : default. : : So, is there any way to shut off the hyperthreading? I've tried : disabling it in the BIOS, and had no luck whatsoever. Hyperthreading is built into the kernel by default starting with FreeBSD-4.9. However, it is not enabled by default. To do so, do a "sysctl machdep.hlt_logical_cpus=0"
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