CSCI-1680 Transport Layer III Congestion Control Strikes Back
CSCI-1680 Transport Layer III Congestion Control Strikes Back
Chen Avin
Based partly on lecture notes by David Mazi?res, Phil Levis, John Jannotti, Peterson & Davie, Rodrigo Fonseca and "Computer Networking: A Top Down Approach" - 6th edition
Last Time
? Flow Control ? Congestion Control
Today
? More TCP Fun! ? TCP Throughput ? TCP fairness ? TCP on Lossy Links ? Congestion Control versus Avoidance
? Getting help from the network
? Cheating TCP
TCP Throughput
? Assume a TCP congestion of window W (segments), round-trip time of RTT, segment size MSS
? Sending Rate S = W x MSS / RTT (1)
? Drop: W = W/2
? grows by MSS for W/2 RTTs, until another drop at W W
? Average window then 0.75xS
? From (1), S = 0.75 W MSS / RTT (2)
? Loss rate is 1 in number of packets between losses:
? Loss = 1 / (W/2 + W/2+1 + W/2 + 2 + ... + W) = 1 / (3/8 W2) (3)
TCP Throughput (cont)
? Loss = 8/(3W2) W 8
(4)
3 Loss
? Substituting (4) in (2), S = 0.75 W MSS / RTT ,
Throughput 1.22 MSS RTT Loss
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