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Fetch multiple completions at once in InfRcTransport (August 2 0142014, John Ousterhout)
InfRcTransport used to retrieve completions (both from serverRxCq and clientRxCq) one-at-a-time. This optimization changed the code to retrieve many at once, if there are several available. This improved "clusterperf readThroughput" from 875 kreads/sec to 948 kreads/sec.
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