http://bugzilla.kernel.org/show_bug.cgi?id=15328





--- Comment #8 from Jérôme Glisse <gli...@freedesktop.org>  2010-02-18 17:02:45 
---
Ok so it's more likely because on non PAT get_page_memtype always return -1
thus we always do set_wb and if page were already wb it likely kill perf. I
don't think we ever do WC -> UC or UC -> WC.

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