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I-D ACTION:draft-sarolahti-tsvwg-tcp-frto-04.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.


	Title		: F-RTO: An Algorithm for Detecting Spurious 
                          Retransmission Timeouts with TCP and SCTP
	Author(s)	: P. Sarolahti, M. Kojo
	Filename	: draft-sarolahti-tsvwg-tcp-frto-04.txt
	Pages		: 17
	Date		: 2003-6-3
	
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 detecting spurious TCP RTOs. 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 helps to avoid
additional unnecessary retransmissions and thereby improves TCP
performance in case of a spurious timeout.

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