On Wed, 9 Jul 2003, Brooks Davis wrote: ... > P4's below ~3.1GHz do not actually provide logical CPU support.
All the 800Mhz FSB P4s have HyperThreading, regardless of the clockspeed. And so do some P4 533MHz FSB chips. The CPU feature flags that FreeBSD displays does tell whether your chip supports HyperThreading or not. But, as it has already been mentioned, the motherboard and BIOS need to provide a MP table. At some later point, HyperThreading will also be able to be enabled by ACPI. Either way, if your BIOS and motherboard pre-date HyperThreading, it just isn't going to work. Some diligent motherboard makers may release a BIOS update to allow their older boards to use HyperThreading, but many would prefer that you buy a new motherboard! Also, Xeons seem to all have HyperThreading now too. I have a dual P4 Xeon 2.4 that supports HyperThreading just fine. > -- Brooks Tom _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "[EMAIL PROTECTED]"
