Messages in this thread | | | Date | Mon, 19 Oct 2009 17:31:34 +0200 | From | Ingo Molnar <> | Subject | Re: [RFC Patch] use MTRR for write combining if PAT is not available |
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* Thomas Schlichter <thomas.schlichter@web.de> wrote:
> I don't think this is a good idea, Robert Hancock wrote there may be > millions of such Laptops (Core Solo/Duo erratum AE7, Pentium M erratum > Y31) : > > http://marc.info/?l=linux-kernel&m=125537136105246&w=2 > > > or Perhaps just try to add mtrr only for the pci mmap case like the > > 4th patch in this series.. > > I'd prefer this! ;-)
Hm, we could perhaps do that - but i think we should only do that on systems that have PAT disabled.
Which brings up the question of how to properly QA such a narrow segment of the market. Maybe disabling CONFIG_X86_PAT should enable that logic too.
Ingo
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