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Other changes proposed to TCP
This list is an arbitrary and incomplete set of pointers to
papers about other changes that have been proposed to TCP.
On the Generation and Use of TCP Acknowledgments,
ACM CCR, October 1998.
This paper compares acking-every-packet and delayed-ack mechanisms
with three alternate mechanisms: acking-every-packet only during
slow-start; unlimited byte-counting; and limited byte-counting.
With unlimited byte-counting, the sender increases its congestion
window based on the number of bytes covered by each ack.
With limited byte-counting, the increase of the congestion window
for each ack is limited to two segments.
Mohit Aron and Peter Druschel,
TCP: Improving Start-up Dynamics by Adaptive Timers and
TR98-318, Rice University, 1998.
This paper proposes the use of packet pacing in the initial
slow-start, and proposes a method for conservatively estimating
the initial ssthresh.
This paper also proposes decoupling the clock granularity used for
measuring the roundtrip time from that used for scheduling events,
shorter retransmission timeouts.
Hari Balakrishnan and Randy H. Katz,
Explicit Loss Notification and Wireless Web Performance,
IEEE Globecom Internet Mini-Conference, Nov. 1998 (to appear).
This paper proposes Explicit Loss Notification to improve performance
when a mobile host is the TCP sender.
Hari Balakrishnan, Venkata
Padmanabhan, and Randy H. Katz,
The Effects of Asymmetry on TCP Performance
Third ACM/IEEE Mobicom
Conference, Budapest, Hungary, Sep 1997.
This paper proposes techniques for decreasing the frequency of
ACKs on the constrained reverse channel ("ACK congestion control"
and "ACK filtering"), techniques to reduce source burstiness
when ACKs are infrequent ("sender adaptation via traffic
shaping" and "ACK reconstruction"), and algorithms for
scheduling data and ACKs at the reverse bottleneck router.
Reuven Cohen and Srinivas Ramanathan,
TCP for High Performance in Hybrid Fiber Coaxial
Broad-Band Access Networks,
IEEE/ACM Transactions on Networking, Vol. 6, No. 1, February 1998.
This paper proposes proper sizing of TCP socket buffers, an initial
window of two packets (as opposed to one packet), smaller MSS values
to counterack problems with delayed ACKs and ACK losses,
a finer granularity for TCP timers, and Fast Retransmit triggered by
a single dup ACK.
T. Faber, J. Touch and W. Yue,
Avoiding the TCP TIME_WAIT state at Busy Servers,
Working Draft, September 1997.
This internet draft describes two methods
for avoiding the accumulation of TCP
TIME_WAIT states at a network server, including a TCP modification that
causes clients rather than servers to enter TIME_WAIT state.
Sally Floyd and Thomas Henderson,
The NewReno Modification to TCP's Fast Recovery Algorithm,
Working Draft, February 1999
This internet draft describes a specific algorithm for responding to partial
acknowledgments, referred to as NewReno. This response to partial
acknowledgments was first proposed by Janey Hoe in [Hoe95].
Thomas Henderson and Randy Katz,
Transport Protocols for Internet-Compatible Satellite Networks,
(to appear), IEEE Journal on Selected Areas in Communications, 1999.
This paper compares the performance of various TCP implementations
in a satellite environment, and discusses the use of a satellite gateway,
proxy, or web cache to "split" transport connections in
a manner transparent to users. The paper proposes a new transport
protocol, Satellite Transport Protocol (STP), optimized for the
asymmetric bandwidth and high latency of satellite environments.
TCP Control Block Interdependence,
RFC 2140, April 1997.
This informational RFC proposes interdependent TCP control blocks for
sharing TCP state among concurrent connections or across similar
Vikram Visweswaraiah and John Heidemann,
Improving Restart of Idle TCP Connections,
Technical Report 97-661, University of Southern
California, November, 1997.
This paper proposes pacing packets during a restart of an idle
TCP connection until the "ACK clock" can be restarted.
- Venkata Padmanabhan,
TCP Fast Start: A Technique For Speeding Up Web Transfers,
Global Internet '98 Conference, November 1998.
This paper proposes that the sender caches network parameters,
and uses higher drop priority for packets sent during
The Commercial World: Selected Pointers
Again, an arbitrary and incomplete set of pointers to
things that I have run across.
TCP Rate Control, Packeteer. This applies rate-based flow
control policies to both individual traffic flows and classes of
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Last modified: January 1999