CS536-2009-02-26

CS536-2009-02-26 - CS536: Transport Layer TCP Vegas Charles...

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CS536: Transport Layer TCP Vegas Charles Killian Transport Layer 1
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Announcements Programming assignment 1 (2/28, 11:59pm) “Free” 12-hour extension (see email) 10 points off every 12 hours beyond No submissions accepted after 3/2, 11:59pm. Reading assignment XCP: Due Tuesday Mid-term (Thursday, March 12 th , in class) Let me know if you must schedule a make-up. Rescheduled class (April 21,23) Wednesday, April 15 th , 6-9pm, BRNG B222 Transport Layer 2
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Recap TCP Reno (Canonical TCP) Not default in today’s OSes Fast-retransmit Slow start Congestion window Transport Layer 3-3
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Transport Layer 3-4
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TCP Vegas TCP Vegas: End to End Congestion Avoidance on a Global Internet Authors: Lawrence S. Bramko Larry L. Peterson “Wrote the [other] book” Date: 1995 Transport Layer 3-5
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Overview Modify TCP Implementation Not TCP Specification Sender only Full interoperability Better congestion control Proactive, not reactive Between 37 and 71% better throughput Not achieved by stealing bandwidth Retains fairness, uses bw more effectively Retransmit 20 to 50% as much data as Reno Transport Layer 3-6
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Tools U-Arizona’s x-kernel framework Modification of Reno Simulation results Why? Built own Runs actual C code Traffic generation (TRAFFIC) Telnet, ftp, nntp, smtp Trace facility Transport Layer 3-7
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Techniques New retransmission mechanism Congestion avoidance mechanism Modified slow-start mechanism Transport Layer 3-8
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Old Retransmission Mechanism Retransmit timeout [TCP Spec] BSD – 500 ms clock • Explains questions about delayed acking
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CS536-2009-02-26 - CS536: Transport Layer TCP Vegas Charles...

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