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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