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Pavel Machek wrote: > Hi! > > >>>User on cpu1 reads time, communicates it to cpu2, but cpu2 is drifted >>>-50ns, so it reads time "before" time reported cpu1. And gets confused. >>> >> >>How can you get that communication to happen in < 50 ns? > > > I'm not sure I can do that, but I'm not sure I can't either. CPUs > snoop each other's cache, and that's supposed to be fast... > Even over a 400 MHz FSB you have 2.5 ns cycles. I doubt you can transfer a cache line in 20 FSB cycles. -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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