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    SubjectRe: [RFC PATCH 1/3] Unified trace buffer
    Steven Rostedt wrote:
    > On Fri, 26 Sep 2008, Ingo Molnar wrote:
    >> Firstly they need a low-frequency (10khz-100khz) shared clock line
    >> across all CPUs. A single line - and since it's low frequency it could
    >> be overlaid on some existing data line and filtered out. That works
    >> across NUMA nodes as well and physics allows it to be nanosec accurate
    >> up to dozens of meters or so.
    > Can this possibly be true? I mean, light travels only one foot every
    > nanosecond. Can it really keep nanosecond accuracy up to dozens of meters
    > away?

    Sure. NTP keeps machines within 1ms (or better) of each other even
    though the network latency is much higher and jittery.


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