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    SubjectRe: HELP: Is writeq an atomic operation??
    > > I don't have an authoritative answer, but I can say that I coded
    > > drivers/infiniband/hw/mthca and .../mlx4 assuming that writeq() is
    > > atomic in the sense that you say, and no one has reported any problems.
    > >
    > If you're not under lock you're screwed on a 32-bit platform.

    So what cycles does an MMX, SSE or double float store generate on the
    bus ?


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