One hop Reputations for Peer to Peer File Sharing Workloads

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One hop Reputations for Peer to Peer File Sharing
Workloads

• Michael Piatek Tomas Isdal Arvind Krishnamurthy
  Thomas Anderson
• University of Washington

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Motivation

• P2P networks use incentives to promote good
  (discourage bad) behavior.

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Outline

• BitTorrent
• One hop reputation
• Evaluation

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BitTorrent

• Between January 26th and February 3rd, 2007,
  measured membership and download performance for
  instrumented clients participating in 13,353
  swarms. We refer to this trace as BT-1.
• Collected a second trace, BT-2, from the same
  cluster over the month of August 2007, providing
  measurements of 55,523 swarms.

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BitTorrent

• The median download rate in observed swarms is 14
  KBps for a peer contributing 100 KBps
• 25 of swarms are unavailable
• These performance and availability problems are
  not fundamental
• Existing incentives in BitTorrent are largely
  ineffective

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BitTorrent
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BitTorrent
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BitTorrent
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BitTorrent
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BitTorrent
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BitTorrent
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One hop reputation
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One hop reputation
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One hop reputation
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One hop reputation
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Evaluation
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Evaluation
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Evaluation
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Evaluation
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Evaluation
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Evaluation
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Evaluation