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What advantage does this have over the regular snooping protocol without hierarchies?


@huehue: Here a processor only has to broadcast to the processors on its interconnect, instead of ALL the processors.


But wouldn't the processor still have to wait until all processors, even outside of its interconnect, respond with whether they have the line or not?


@huehue: Thats true, but if the processors on the same interconnect do have the cache line, then there is no need of broadcast at the next level of interconnect.