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Soluon only sample for segments with no retransmission

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Unformatted text preview: h pattern: 70 60 50 40 30 20 10 1.0 2.0 3.0 4.0 5.0 Time (seconds) 6.0 7.0 8.0 9.0 10.0 Pusng it together •  TCP has two states: Slow Start (SS) and Conges)on Avoidance (CA) •  A window size threshold governs the state transi)on –  Window <= threshold: SS –  Window > threshold: conges)on avoidance •  States differ in how they respond to ACKs –  Slow start: w = w + MSS –  Conges)on Avoidance: w = w + MSS2/w (1 MSS per RTT) •  On loss event: set w = 1, slow start How to Detect Loss •  Timeout •  Any other way? –  Gap in sequence numbers at receiver –  Receiver uses cumula)ve ACKs: drops => duplicate ACKs •  3 Duplicate ACKs considered loss Pusng it all together cwnd Timeout AIMD Timeout AIMD ssthresh Slow Start Slow Start Slow Start Time RTT •  We want an es)mate of RTT so we can know a packet was likely lost, and not just delayed •  Key for correct...
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