Response time of antiparallel connections with respect to congestion - - PowerPoint PPT Presentation

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Sep 18, 2022 28 likes •109 views

The problem Possible solutions A few results Conclusion Response time of antiparallel connections with respect to congestion control algorithms Tristan BRAUD Advisors: Martin HEUSSE Guillaume URVOY-KELLER May 15 st 2014 Response time of

SLIDE 1

The problem Possible solutions A few results Conclusion

Response time of antiparallel connections with respect to congestion control algorithms

Tristan BRAUD

Advisors: Martin HEUSSE Guillaume URVOY-KELLER

May 15st 2014

Response time of antiparallel connections with respect to congestion control algorithms 1

SLIDE 2

The problem Possible solutions A few results Conclusion

A common situation: an user browsing the Internet through a DSL link

Response time of antiparallel connections with respect to congestion control algorithms 2

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The problem Possible solutions A few results Conclusion

What often happens

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The problem Possible solutions A few results Conclusion

A non exhaustive list of possible solutions

In the core network:

Fair queuing Smaller uplink buffers

End to end

TCP stack: modifying the TCP variant may affect the performances Adding more traffic? adding smaller UDP packets could virtually decrease the buffer size.

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The problem Possible solutions A few results Conclusion

Combining different TCP variants on the uplink and downlink

1 10 100 10000 100000 1e+06 Time to complete (s) Size (Bytes)

Vegas Up Vegas Down

New Reno / Cubic Up NewReno/Cubic Up/Down

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The problem Possible solutions A few results Conclusion

Adding more traffic

Up Down % 20 40 60 80 100 Up Down % 20 40 60 80 100 Up Down % 20 40 60 80 100 Up Down % 20 40 60 80 100 Up Down ms 100 300 500 Up Down ms 100 300 500 Up Down ms 100 300 500 Up Down ms 100 300 500

Link utilization RTT Large buffer With UDP UDP bursty Small buffer Response time of antiparallel connections with respect to congestion control algorithms 6

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The problem Possible solutions A few results Conclusion

A few viable solutions in End to end Still, modifying the core buffers remain the best solution

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The problem Possible solutions A few results Conclusion

Thank you for your attention

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