i686 is the ISA for the Pentium Pro. It does not include any of the new instructions for the PII, PIII, or P4.

-David

Christopher Henderson wrote:

Is there any performance benefit to be wrought from recompiling the
kernel for a P4 system? Or is the i686 build optimized enough? Will I
get full SSE2 support with that kernel? Not that too many apps use it
yet...but hey.

Thnx,
~Christopher






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