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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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