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losses have large eect on throughput fast recovery

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Unformatted text preview: opera)on •  Challenge: RTT can be highly variable –  Both at long and short )me scales! •  Both average and variance increase a lot with load •  Solu)on –  Use exponen)ally weighted moving average (EWMA) –  Es)mate devia)on as well as expected value –  Assume packet is lost when )me is well beyond reasonable devia)on Originally •  EstRTT = (1 – α) × EstRTT + α × SampleRTT •  Timeout = 2 × EstRTT •  Problem 1: –  in case of retransmission, ack corresponds to which send? –  Solu)on:...
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