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Setup

Setup. Internet. www.postel.org. Relatively small sample 20K Connections collected over few days Existing unmodified site being served. Ignored all connections except those to or from port 80 Default prediction accuracy = 70% of MaxCwnd

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Setup

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  1. Setup Internet www.postel.org • Relatively small sample • 20K Connections collected over few days • Existing unmodified site being served. • Ignored all connections except those to or from port 80 • Default prediction accuracy = 70% of MaxCwnd • Last slide shows impact for other prediction accuracies

  2. Most connections are short and have small MaxCwnd • Small number of connections have large Cwnds Improvement Here Cwnd > 10 Pkts

  3. Most connections are short (mice) • Most traffic is carried by the long connections (elephants) • No opportunities to optimize on the incoming path

  4. Connections Not Too Short Or Too Long • Opportunities to optimize the transfer out • We know the expected sizes, RTT and other information • Identified region carries 74% of bytes in sample data

  5. ALN impacts only those that have atleast few RTTs • Little impact on very long connections

  6. Most connections < 400 ms RTT • Grouping of RTTs about 10ms (LAN), 80ms

  7. ALN impacts about 5% of the connections • Depending on RTT and Cwnd, estimated speedup < 2x

  8. Upto 70% of the traffic in bytes can be improved • The max improvement is about 2x.

  9. Experimental Artifact • Bulk of the speedup between MaxCwnd = 10-25 Pkts • The exact gain depends on the access distribution

  10. Connection < 400ms RTT account for bulk of gain • Relatively uniform distribution before 400ms • MaxCwnd is probably a better selector

  11. Lower => Better, Right => Better • Significant gains from 20% accuracy itself • Improved accuracy can bring another 20-30%

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