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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. -hpa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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