Messages in this thread | | | Date | 15 Apr 2004 18:38:18 +0200 | Date | Thu, 15 Apr 2004 18:38:18 +0200 | From | Andi Kleen <> | Subject | Re: PAT support |
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> This would also be extremely useful on machines with large amounts > of memory, for write-back mappings. With large amounts but odd sized > entries it becomes extremely tricky to map all of the memory using > mtrrs.
Yes agreed. I already had vendors complaining about this. But for this it will need some more work - the MTRRs need to be fully converted to PAT and then disabled (because MTRRs have higher priority than PAT). Doing so is a lot more risky than what Terrence's patch does currently though. But longer term we will need it.
Also it will still need to handle overlapping ranges. I suppose it will need some simple rules like: converting from UC to WC is always ok.
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