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Prevent the sender from sending too far ahead of an unacked packet

Zlatin Balevsky requested to merge (removed):choking-retransmission-fix into master

Prevents the following scenario from happening:

  1. Senders window grows past MAX_SIZE/2
  2. First packet in the window gets lost, the rest get acked
  3. Sender sends another full window
  4. Receiver's window exceeds MAX_SIZE and drops all packets after that

With many lost packets recovery is very slow and there is a big drop in throughput.

Merge request reports

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