Network Working Group W. Eddy
Internet-Draft MTI Systems
Intended status: Experimental L. Wood
Expires: April 23, 2014 Surrey alumni
W. Ivancic
NASA
October 20, 2013
TFRC-based Congestion Control for Saratoga
draft-eddy-tsvwg-saratoga-tfrc-04
Abstract
This document specifies the use of TCP-Friendly Rate Control (TFRC)
with the Saratoga data transfer protocol. The necessary conventions
that a Saratoga sender and receiver implementation must follow if
they wish to enable the use of TFRC are described.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Receiver-Side Behavior . . . . . . . . . . . . . . . . . . . 3
3. Sender-Side Behavior . . . . . . . . . . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . 7
Appendix A. Differences from Shahriar et al. . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
In order to support use of the Saratoga protocol
[draft-wood-tsvwg-saratoga] on networks with multiple data flows,
multiple hops, and/or experimentally on the Internet, some form of
congestion control is required. Particularly, for use on the
Internet, rather than the private links and networks that Saratoga
was originally developed for, congestion control is a requirement, as
indicated by the UDP Guidelines [RFC5405].
This document provides the specification of one type of congestion
control, based on TCP-Friendly Rate Control (TFRC), which is intended
to be fairly conservative in terms of performance. Better-performing
congestion-control algorithms are possible in terms of throughput,
but this TFRC-based algorithm has the advantages of being relatively
simple and based on the well-established TFRC components, rather than
on a newer and less well-tested mechanism.
Saratoga data flow occurs within uniquely identified transactions
between a sender and receiver. Saratoga primitively supports link-
local multicast to a set of receivers, but that use case is not
considered further in this specification and is considered out of
scope for this document. The congestion control mechanism specified
in this document operates within a single transaction between a
sender and a receiver. Subsequent or concurrent transactions between
the same nodes use distinct congestion control state.
TFRC has "receiver-based" and "sender-based" variations, as
datatracker.ietf.org