Name: draft-ietf-tcpm-frto-02
Title: F-RTO: An Algorithm for Detecting Spurious Retransmission Timeouts with TCP and SCTP
State: Pending
Authors: Pasi Sarolahti, Markku Kojo
Group: TCP Maintenance and Minor Extensions (tcpm)
Date: 2004-11-18
Spurious retransmission timeouts cause suboptimal TCP performance, because
they often result in unnecessary retransmission of the last window of data.
This document describes the F-RTO detection algorithm for detecting
spurious TCP retransmission timeouts. 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 a timeout, the F-RTO algorithm at
a TCP sender monitors the incoming acknowledgments to determine whether the
timeout was spurious and to decide whether to send new segments or
retransmit unacknowledged segments. The algorithm effectively helps to
avoid additional unnecessary retransmissions and thereby improves TCP
performance in case of a spurious timeout. The F-RTO algorithm can also be
applied to SCTP.
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