Messages in this thread | | | Date | Mon, 28 Oct 2013 12:45:41 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH] X86: MM: Add PAT Type write-through in combination with mtrr |
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Drop Dave's stale mail address.
On Mon, Oct 28, 2013 at 12:25:05PM +0100, Andreas Werner wrote: > > but you end up doing > > > > PAT=Write-Back + MTRR=Write-Through = Effective Memory of Write-Back > > > No the effective memory type is WT, check out the Intel document with the > table of Effective memory type combinations.
You need to read what I'm saying more carefully.
> Yes but, there is no way in the kernel to mark a memory WT,
That doesn't mean you can return _PAGE_CACHE_WB for MTRR_TYPE_WRTHROUGH. The correct thing to do, IMHO, would be to set the PWT bit in the PTEs of those pages comprising your buffer.
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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