Protocol Action: TCP Performance Implications of Network Asymmetry to BCP
Aaron Falk <falk <at> isi.edu>
2002-10-10 17:23:18 GMT
Congratulations to the authors. Well done!
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From: The IESG <iesg-secretary <at> ietf.org>
Subject: Protocol Action: TCP Performance Implications of Network
Asymmetry to BCP
Date: Thu, 10 Oct 2002 12:56:52 -0400
The IESG has approved the Internet-Draft 'TCP Performance Implications
of Network Asymmetry' <draft-ietf-pilc-asym-08.txt> as a BCP. This
document is the product of the Performance Implications of Link
Characteristics Working Group. The IESG contact persons are Allison
Mankin and Scott Bradner.
This document describes TCP performance problems that may arise if
network paths have asymmetric characteristics. These problems arise
in several access networks, including bandwidth-asymmetric networks
and packet radio subnetworks, for different underlying reasons. However,
the end result on TCP performance is the same in both cases: performance
often degrades significantly because of imperfection and variability in
the ACK feedback from the receiver to the sender.
This document details several mitigations of these effects, which have
either been proposed or evaluated in the literature, or are currently
deployed in networks. These solutions use a combination of local
link-layer techniques, subnetwork, and end-to-end mechanisms,
consisting of: (i) techniques to manage the channel used for the
upstream bottleneck link carrying the ACKs, typically using header
compression or reducing the frequency of TCP ACKs, (ii) techniques to
handle this reduced ACK frequency to retain the TCP sender's
acknowledgment-triggered self-clocking and (iii) techniques to schedule
the data and ACK packets in the reverse direction to improve performance
in the presence of two-way traffic. Each technique is described, together
with known issues, and recommendations for when they should be used, and
recommendations of techniques that should not be used.
Working Group Summary
The working group supported the advancement of the document.
This document was reviewed for the IESG by Allison Mankin.
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