Difficulties

• If profile meter is not in host, it is difficult to set window length to an appropriate RTT

• Connections with longer RTTs than the presumed value will fall slightly under expectations

• If a burst of packets is tagged as “out”, this may force TCP into slow start

• Solution: space out packets tagged as “out” by using a probabilistic function

• To avoid these problems:

- use profile meter in host

- keep TCP in fast recovery using receiver-based control (where there are no drops) or using TCP-SACK

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