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From: Owain Ainsworth (ogacvs.openbsd.org)
Date: Tue Apr 20 2010 - 14:22:06 CDT
Module name: src
Changes by: ogacvs.openbsd.org 2010/04/20 13:22:06
Instead of using PWT|PCD for uncached (which is wrong on old cpus and
HARD uncached on anything since the P3), use just PCD which is UC-
(uncached but mtrrs can override it to write combining).
Now kernel mappings of WC-mtrred memory actually get write combining
the speed up is very very nice.
ok kettenis, deraadt, beck (who likes his scrollbars non-wibbly)