TCP congestion control - Congestion avoidance algorithm

Question

Does congestion avoidance algorithm start with cwnd>=ssthresh or only with cwnd>ssthresh?

cwnd=Congestion windows ssthresh=slow start threshold

score 1 · Accepted Answer · edited Oct 07 '21 at 13:21

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Implementations can choose.

https://www.rfc-editor.org/rfc/rfc5681: When cwnd and ssthresh are equal, the sender may use either slow start or congestion avoidance.

edited Oct 07 '21 at 13:21

Community

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answered Apr 19 '18 at 19:00

FormerNcp

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score 1 · Answer 2 · answered Mar 06 '20 at 14:35

Actually it depends on the algorithm. There are a lot of congestion control algorithm like TCP Tahoe, TCP Reno, TCP Westwood etc. You can check them https://en.wikipedia.org/wiki/TCP_congestion_control here. In Reno, if cwnd <= ssthresh then slow start else congestion avoidance.

TCP congestion control - Congestion avoidance algorithm

2 Answers2