1 Measurements of the Congestion Responsiveness of Windows Streaming Media James Nichols, Mark Claypool, Robert Kinicki and Mingzhe Li Computer Science.

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Presentation transcript:

1 Measurements of the Congestion Responsiveness of Windows Streaming Media James Nichols, Mark Claypool, Robert Kinicki and Mingzhe Li Computer Science Department Worcester Polytechnic Institute Massachusetts, USA NOSSDAV Kinsale, County Cork, Ireland

2 Network Impact of Streaming Media Streaming Media has specific bitrate and timing requirements. Flows unresponsive to congestion can cause unfairness and contribute to congestion collapse. Streaming Media applications rely on the application layer to provide adaptability to available capacity Windows Streaming Media (WSM) uses Intelligent Streaming NOSSDAV 2004

3 Methodology Construct testbed Create/adapt tools Encode content Systematic control Examine SBR clip Range of SBR clips MBR clips Vary loss and latency NOSSDAV 2004

4 Single Bitrate Clip Experiment Hypothesis: SBR clips are unresponsive to congestion Latency: 45 ms Induced loss: 0% Bottleneck capacity: 725 Kbps Start a TCP flow through the link 10 Seconds later stream a WSM clip Measure achieved bitrates and loss rates for each flow NOSSDAV 2004

5 340 Kbps Clip - Bottleneck Capacity 725 Kbps < packet loss After 15 seconds TCP- Friendly?

6 548 Kbps Clip - Bottleneck Capacity 725 Kbps ~ packet loss for WSM ~ packet loss for TCP after 15 seconds Not TCP- Friendly!

Kbps Clip - Bottleneck Capacity 725 Kbps Responsive To Capacity?

8 SBR Clips - Bottleneck Capacity 725 Kbps Buffering Period NOSSDAV 2004

9 SBR Clips - Bottleneck Capacity 725 Kbps Playout Period NOSSDAV 2004

10 Multiple Bitrate Clips Hypothesis: Multiple Bitrates make WSM more responsive to congestion Same experiment as before, but with different encoded content Vary network capacity: 250, 725, 1500 Kbps Created two sets of 10 multiple bitrate clips Experiments with lots of other MBR clips NOSSDAV 2004

11 Multiple Bitrate Content First set of clips (adding lower): 1128 Kbps Kbps Kbps … Kbps NOSSDAV 2004

12 Multiple Bitrate Clips BufferingPlayout NOSSDAV 2004

13 Additional experiments Not enough time to discuss all the results Different bottleneck capacities Vary loss rate and latencies Also looked at other network level metrics: interarrival times, and burst lengths. NOSSDAV 2004

14 Conclusions WSM is not CBR Buffering period Not TCP-friendly Responds to capacity Chooses highest rate less than capacity Otherwise, lowest rate available Performance depends upon encoding NOSSDAV 2004

15 Future Work Run the same experiments with other streaming technologies: RealVideo and Quicktime Examine the effects of different content types Build NS simulation model of streaming media for use in future research NOSSDAV 2004

16 Measurements of the Congestion Responsiveness of Windows Streaming Media James Nichols, Mark Claypool, Robert Kinicki and Mingzhe Li NOSSDAV Kinsale, County Cork, Ireland