A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : F-RTO: A TCP RTO Recovery Algorithm for Avoiding
Unnecessary Retransmissions
Author(s) : P. Sarolahti, M. Kojo
Filename : draft-sarolahti-tsvwg-tcp-frto-02.txt
Pages : 15
Date : 2002-11-7
Spurious retransmission timeouts (RTOs) cause suboptimal TCP
performance, because they often result in unnecessary retransmission
of the last window of data. This document describes the 'Forward RTO
Recovery' (F-RTO) algorithm for recovering from the TCP RTOs
efficiently even when the RTO was spurious. F-RTO is a TCP sender
only algorithm that does not require any TCP options to operate.
After retransmitting the first unacknowledged segment triggered by an
RTO, the F-RTO algorithm at a TCP sender monitors the incoming
acknowledgements to determine whether the timeout was spurious and to
decide whether to send new segments or retransmit unacknowledged
segments. The algorithm effectively avoids additional unnecessary
retransmissions and thereby improves TCP performance in case of a
spurious timeout.
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