Date: Fri, 20 Nov 2015 11:14:57 +0100 From: AlexandreFressange <deco33000@yandex.com> To: freebsd-amd64@freebsd.org Subject: PAT and identity mapped pages. Message-ID: <424171448014497@web5m.yandex.ru>
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Hi, On x86_64, every memory page entry has a bit (4) to control its cache method: write-back or write-through. But even on identity mapped pages, you still use paging. Say, I want a page to be uncached; I can use the PAT to Uncached. In this case, what happens to the bit 4 of the accessed page? is it ignored? Thanks --š Alex
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