Date: Sat, 13 Dec 2003 20:58:00 +0100 From: "Stefan Cars" <stefan@snowfall.se> To: "'Rob'" <nospam@users.sourceforge.net> Cc: questions@freebsd.org Subject: RE: Need help: HyperThreading-CPU + FreeBSD-Stable + Multi-threading Message-ID: <20031213195759.4A20F75D6@mail.snowfall.se> In-Reply-To: <3FD9D78E.7020106@users.sourceforge.net>
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Hi! This is strange, my system doesn't even show mchdep.hlt_logical_cpus, very weird. My system have HT /S -----Original Message----- From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd-questions@freebsd.org] On Behalf Of Rob Sent: den 12 december 2003 15:58 To: freebsd-questions@freebsd.org Subject: Need help: HyperThreading-CPU + FreeBSD-Stable + Multi-threading Hello, Recently I've got a new PC: P4 Titan 2.6 GHz. It says in the brochure that it has "HyperThreading", which I think is somehow related to the HyperThread thing in the FreeBSD kernel, right? I know there's this message in /usr/src/UPDATING, which unfortunately does not clear up the matter for me. So let me recap what I believe to understand: For utilizing the advantages of this HyperThreading stuff for users, I need in the kernel configuration: options SMP # Symmetric MultiProcessor Kernel options APIC_IO # Symmetric (APIC) I/O Furthermore, I need to set "machdep.hlt_logical_cpus" to 0 (zero). How do I add this to "the loader" so that it is set to zero at every boot up? Should I simply add to my /boot/loader.conf a line like: machdep.hlt_logical_cpus="0" After that, I'm done with the hyperthreading? Thanks, Rob. PS: if you're in the mood, I would appreciate a few words on what this HyperThreading is about and what advantages I can expect. Thanks too! _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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