Slow start and congestion avoidance of TCP Reno

[Vineet]

Hello All,

I am tracking the congestion window of a TCP Reno source. After the initial slow-start phase, the source enters congestion avoidance phase. Theoretically, on seeing a packet loss the congestion window is halved and it is increased by 1 packet every RTT. But the congestion window graph obtained experimentally (shown below) suggests something else. After every loss, the source enters slow-start again (seen as spikes in the graphs) and during the next packet loss congestion avoidance is resumed. Why is there a difference between theory and implementation? Am I missing out on some important detail here? 

Experimental observation:

Ideal congestion window profile taken from the internet.

Any cues in this regard will be of great help!

Thanks in advance,

Vineet

[Nat P]

You are missing Cwnd inflation/deflation. Please read the RFCs on congestion control algorithms.

[Vineet Gokhale]

Thanks much Nat for the pointer :)

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