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Title : Avoiding Interactions of Quick-Start TCP and Flow Control
Author(s) : M. Scharf, et al.
Filename : draft-scharf-tsvwg-quick-start-flow-control-01.txt
Pages : 14
Date : 2007-7-5
This document describes methods to avoid interactions between the
flow control of the Transmission Control Protocol (TCP) and the
Quick-Start TCP mechanism. Quick-Start is an optional TCP congestion
control extension that allows hosts to determine an allowed sending
rate from feedback of routers along the path. With Quick-Start, data
transfers can start with a potentially large congestion window and
avoid the time-consuming slow-start. In order to fully utilize the
data rate determined by Quick-Start, the sending host must not be
limited by the TCP flow control, i. e., the amount of free buffer
space advertised by the receive window.
There are two potential interactions between Quick-Start and the TCP
flow control: First, receivers might not provide sufficiently large
buffer space after connection setup, or they may implement buffer
allocation strategies that implicitly assume the slow-start behavior
on the sender side. This document therefore provides guidelines for
buffer allocation in hosts supporting the Quick-Start extension.
Second, the TCP receive window scaling mechanism interferes with
Quick-Start when being used in the initial three-way handshake
connection setup. This document describes a simple solution to
overcome this problem.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-scharf-tsvwg-quick-start-flow-control-01.txt
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