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    SubjectRe: Intel P6 vs P7 system call performance
    Pavel Machek wrote:
    >>
    >>don't many of the multi-CPU problems with tsc go away because you've got a
    >>per-cpu physical page for the vsyscall?
    >>
    >>i.e. per-cpu tsc epoch and scaling can be set on that page.
    >
    > Problem is that cpu's can randomly drift +/- 100 clocks or so... Not
    > nice at all.
    >

    ­­±100 clocks is what... ±50 ns these days? You can't get that kind of
    accuracy for anything outside the CPU core anyway...

    -hpa

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