Lecture 9 Notes

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Unformatted text preview: ir and eﬃcient! Eﬃcient: A+B = C Flow Rate A Chiu Jain Phase Plots Flow Rate B MI MD Fair: A = B Eﬃcient: A+B = C Flow Rate A Chiu Jain Phase Plots Flow Rate B AI AD Fair: A = B Eﬃcient: A+B = C Flow Rate A Chiu Jain Phase Plots Fair: A = B Flow Rate B MD AI Eﬃcient: A+B = C Flow Rate A AIMD Implementa)on •  In prac)ce, send MSS- sized segments –  Let window size in bytes be w (a mul)ple of MSS) •  Increase: –  Aber w bytes ACKed, could set w = w + MSS –  Smoother to increment on each ACK •  w = w + MSS * MSS/w •  (receive w/MSS ACKs per RTT, increase by MSS/(w/MSS) for each) •  Decrease: –  Aber a packet loss, w = w/2 –  But don’t want w < MSS –  So react diﬀerently to mul)ple consecu)ve losses –  Back oﬀ exponen)ally (pause with no packets in ﬂight) AIMD Trace •  AIMD produces sawtooth pajern of window size AIMD trace KB –  Always probing available bandwidth • Window trace produces sawtoot...
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