GateKeeper: Making Streaming Overlays Bandwidth Aware

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• Ant Rowstron, Microsoft Research Cambridge
• Tuesday 13 November 2007, 14:30-15:30
• Room FW26, Computer Laboratory, William Gates Building.

If you have a question about this talk, please contact Minor Gordon.

Scalable media streaming using overlays is becoming popular, but to support high bit-rate streams and smooth, uninterrupted playback is challenging. The maximum supported stream rate is constrained by the aggregate outbound bandwidth of the overlay; if this bandwidth is less than required then a large number of users can experience poor playback. Managing the overlay bandwidth efficiently is a major challenge especially when a significant number of overlay members are behind asymmetric links. In this talk I will describe GateKeeper, a system that dynamically monitors and profiles the overlay-wide bandwidth and usage. I will demonstrate how this information can be used to allow an overlay to adapt to the available bandwidth – including admission control, dynamic streaming rate scaling and per-node contribution adaption. This is joint work with Frank Uyeda (UCSD), Simon Schubert, Denisa Ghita and Dejan Kostic (EPFL).

This talk is part of the Computer Laboratory Opera Group Seminars series.

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