A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Identifying Modified Explicit Congestion Notification (ECN) Semantics for Ultra-Low Queuing Delay
Authors : Koen De Schepper
Bob Briscoe
Ing-jyh Tsang
Filename : draft-briscoe-tsvwg-ecn-l4s-id-00.txt
Pages : 22
Date : 2015-10-19
Abstract:
This specification defines the identifier to be used on IP packets
for a new network service called low latency, low loss and scalable
throughput (L4S). It is similar to the original (or 'Classic')
Explicit Congestion Notification (ECN). 'Classic' ECN marking was
required to be equivalent to a drop, both when applied in the network
and when responded to by a transport. Unlike 'Classic' ECN marking,
the network applies the L4S identifier more immediately and more
aggressively than drop, and the transport response to each mark is
reduced and smoothed relative to that for drop. The two changes
counterbalance each other so that the bit-rate of an L4S flow will be
roughly the same as a 'Classic' flow under the same conditions.
However, the much more frequent control signals and the finer
responses to them result in ultra-low queuing delay without
compromising link utilization, even during high load. Examples of
new active queue management (AQM) marking algorithms and examples of
new transports (whether TCP-like or real-time) are specified
separately. The new L4S identifier is the key piece that enables
them to interwork and distinguishes them from 'Classic' traffic. It
gives an incremental migration path so that existing 'Classic' TCP
traffic will be no worse off, but it can be prevented from degrading
the ultra-low delay and loss of the new scalable transports.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-briscoe-tsvwg-ecn-l4s-id/
There's also a htmlized version available at:
https://tools.ietf.org/html/draft-briscoe-tsvwg-ecn-l4s-id-00
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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