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    SubjectRe: page fault scalability patch V12 [0/7]: Overview and performance tests
    Benjamin Herrenschmidt wrote:
    > They may not end up in order if they are stores (the stores to the
    > taskfile may be out of order vs; the loads/stores to/from the data
    > register) unless you have a spinlock protecting both or a full sync (on
    > ppc), but then, I don't know the ordering things on x86_64. This could
    > certainly be a problem on ppc & ppc64 too.


    Is synchronization beyond in[bwl] needed, do you think?

    This specific problem is only on Intel ICHx AFAICS, which is PIO not
    MMIO and x86-only. I presumed insw() by its very nature already has
    synchronization, but perhaps not...

    Jeff


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