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Observations on the dynamics of a congestion control algorithm: The effects of two-way traffic (1991)

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by Lixia Zhang , Scott Shenker , David D. Clark
Venue:In Proceedings of ACM SIGCOMM
Citations:383 - 6 self
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BibTeX

@INPROCEEDINGS{Zhang91observationson,
    author = {Lixia Zhang and Scott Shenker and David D. Clark},
    title = {Observations on the dynamics of a congestion control algorithm: The effects of two-way traffic},
    booktitle = {In Proceedings of ACM SIGCOMM},
    year = {1991}
}

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Abstract

We use simulation to study the dynamics of the congestion cent rol algorithm embedded in the BSD 4.3-Tahoe TCP implementation. We investigate the simple case of a few TCP connections, originating and terminating at the same pair of hosts, using a single bottleneck link. This work is an extension of our earlier work ([16]), where one-way traffic (i.e., all of the sources are on the same host and all of the destinations are on the other host) was studied. In this paper we investigate the dynamics that results from two-way traffic (in which there are data sources on both hosts). We find that the one-way traffic clustering and loss-synchronization phenomena d~cussed in [16] persist in this new situation, albeit in a slightly modified form. In addition, there are two new phenomena not present in the earlier study: (1) ACK-compression, which is due to the interaction of data and ACK packets and gives rise to rapid fluctuations in queue length, and (2) an out-of-phase queue-synchronization mode, which keeps link utilization less than optimal even in the limit of very large buffers. These phenomena are helpful in understanding results from an earlier study of network oscillations ([19]). 1

Keyphrases

two-way traffic    congestion control algorithm    new situation    data source    single bottleneck link    network oscillation    large buffer    simple case    congestion cent rol algorithm    rapid fluctuation    queue length    out-of-phase queue-synchronization mode    3-tahoe tcp implementation    one-way traffic clustering    loss-synchronization phenomenon    ack packet    tcp connection    one-way traffic    new phenomenon   

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