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Analyzing and Improving a BitTorrent Network’s Performance Mechanisms (2006)

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by Ashwin R. Bharambe , Cormac Herley , Venkata N. Padmanabhan
Citations:177 - 0 self
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BibTeX

@INPROCEEDINGS{Bharambe06analyzingand,
    author = {Ashwin R. Bharambe and Cormac Herley and Venkata N. Padmanabhan},
    title = {Analyzing and Improving a BitTorrent Network’s Performance Mechanisms},
    booktitle = {},
    year = {2006}
}

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Abstract

Abstract — In recent years, BitTorrent has emerged as a very scalable peer-to-peer file distribution mechanism. While early measurement and analytical studies have verified BitTorrent’s performance, they have also raised questions about various metrics (upload utilization, fairness, etc.), particularly in settings other than those measured. In this paper, we present a simulationbased study of BitTorrent. Our goal is to deconstruct the system and evaluate the impact of its core mechanisms, both individually and in combination, on overall system performance under a variety of workloads. Our evaluation focuses on several important metrics, including peer link utilization, file download time, and fairness amongst peers in terms of volume of content served. Our results confirm that BitTorrent performs near-optimally in terms of uplink bandwidth utilization, and download time except under certain extreme conditions. We also show that low bandwidth peers can download more than they upload to the network when high bandwidth peers are present. We find that the rate-based tit-for-tat policy is not effective in preventing unfairness. We show how simple changes to the tracker and a stricter, block-based tit-for-tat policy, greatly improves fairness. I.

Keyphrases

performance mechanism    bittorrent network    download time    uplink bandwidth utilization    simulationbased study    various metric    several important metric    certain extreme condition    upload utilization    fairness amongst peer    block-based tit-for-tat policy    core mechanism    high bandwidth peer    rate-based tit-for-tat policy    overall system performance    low bandwidth peer    analytical study    scalable peer-to-peer file distribution mechanism    peer link utilization    recent year    bittorrent performance    simple change    early measurement   

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