Andi Kleen wrote:
Jesse Barnes <[email protected]> writes:
To do this in a nicer way (and be less vulnerable to similar BIOS
funkiness) the kernel really needs full PAT support. That should allow
WC over WB and WC over UC mappings to occur, at least if I'm
remembering the docs right...
PAT only really helps for device driver performance optimizations.
But if the basic WB MTRRs are wrong PAT cannot really salvage it.
Is there any reason not to set the MTRRs to define the entire memory as
write back, and use PAT exclusively for setting cacheability?
On my home machine for instance, the BIOS uses all 8 MTRRs leaving none
for X. I hacked it by merging a couple of MTRRs but this isn't a
error compiling committee.c: too many arguments to function
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