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SubjectRe: 2G memory split
Alan Cox wrote:

>On Maw, 2006-01-10 at 09:56 -0700, Jeff V. Merkey wrote:
>>RH ES uses 4:4 which is ideal and superior to this hack.
>Its a non trivial trade-off. 4/4 lets you run very large physical memory
>systems much more efficiently than usual but you pay a cost on syscalls
>and some other events when using the majority of processors. The 4/4
>tricks also give most emulations (eg Qemu) serious heartburn trying to
>emulate %cr3 reloading via mmap and other interfaces with high overhead
>in relative terms.
>Of course AMD64 kind of shot the problem in the head once and for all.

Yep, they sure did. Seriously, the 4:4 option should also be present
along with 3:1 and 2:2
splits. You should merge your RH work into this patch and allow both.
It would save me one less
patch to maintain off the tree.

Alan, you're the man.




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