[tcpm] I-D Action:draft-ietf-tcpm-rfc4138bis-04.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions Working Group of the IETF.

	Title           : Forward RTO-Recovery (F-RTO): An Algorithm for Detecting Spurious Retransmission Timeouts with TCP
	Author(s)       : P. Sarolahti, et al.
	Filename        : draft-ietf-tcpm-rfc4138bis-04.txt
	Pages           : 21
	Date            : 2008-10-30

The purpose of this document is to move the F-RTO functionality for
 TCP in RFC 4138 from Experimental to Standards Track status. The F-
 RTO support for SCTP in RFC 4138 remains with Experimental status.
 See Appendix B for the differences between this document and RFC
 4138.

 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 of the TCP sender
 monitors the incoming acknowledgments to determine whether the
 timeout was spurious.  It then decides whether to send new segments
 or retransmit unacknowledged segments.  The algorithm effectively
 helps to avoid additional unnecessary retransmissions and thereby
 improves TCP performance in the case of a spurious timeout.

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