Lecture 10 Notes

# Throughput 1 sqrtloss p0 60 50 40 p 1 30 p

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Unformatted text preview: rop: W = W/2 –  grows by MSS W/2 RTTs, un)l 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 / ( 1 + (W/2 + W/2+1 + W/2 + 2 + … + W) = 1 / (3/8 W2) (3) TCP Throughput (cont) –  Loss = 8/(3W2) 8 (4) ⇒W = 3⋅ Loss –  Subs)tu)ng (4) in (2), S = 0.75 W MSS / RTT , € Throughput ≈ 1 .22 € × MSS RTT ⋅ Loss •  Equation-based rate control can be TCP friendly and have € better properties, e.g., small jitter, fast ramp-up… [Mathis et al. 97] What Happens When Link is Lossy? •  Throughput ≈ 1 / sqrt(Loss) p=0 60 50 40 p = 1% 30 p = 10% 20 10 0 1 26 51 76 101 126 151 176 201 226 251 276 301 326 351 376 401 426 451...
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