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proof proof strategy fix the amount of congestion in flight, then consider how much notification needed Imagine aggregate overload of 103Mbps in flight (for 1 RTT) arrives at queue running at its desired operating point ? 3Mbps for 0.1s = 300kb = 37.5kB to discard (or mark) If all the traffic is in packets of size s [B], e packets need to be lost to lose this excess if queue reduces drop rate for smaller packets if all packets are small, queue will have to be longer to notify the same congestion queue shouldn’t have to change its length so transports need to respond more strongly to larger missing packets ?TCP’s insensitivity to drop size is an artefact, not a principle to be copied n = 1000 flows all same RTT, R = 0.1s 100Mbps |