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    SubjectRe: Intel P6 vs P7 system call performance
    Pavel Machek wrote:
    > Hi!
    >>>>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...
    > 50ns is bad enough when it makes your time go backwards.

    Backwards?? Clock spreading should make the rate change, but it should
    never decrement.


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