Using TCP Selective Acknowledgement (SACK) Information to Determine Duplicate Acknowledgements for Loss Recovery Initiation
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This document describes a TCP sender algorithm to trigger loss
recovery based on the information gathered on a SACK scoreboard
instead of simply counting the number of arriving duplicate
acknowledgements in the traditional way. The given algorithm is more
robust to ACK losses, ACK reordering, missed duplicate
acknowledgements due to delayed acknowledgements, and extra duplicate
acknowledgements due to duplicated segments and out-of- window
segments. The algorithm allows not only a timely initiation of TCP
loss recovery but also reduces false fast retransmits. It has a low
implementation cost on top of the SACK scoreboard defined in RFC 3517.