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Enhancing TCP Throughput with Instant Queue Length-based ECN and Dequeue Marking Techniques

This paper investigates the efficient tuning of instant queue length-based Explicit Congestion Notification (ECN) at switches to improve TCP throughput performance. It emphasizes the use of dequeue marking on ECN and DCTCP for effective congestion control, where incoming packets are marked to avoid drops. The framework develops two thresholds for queue management, ensuring that the queue length never reaches zero, while balancing average queue lengths to maintain performance during congestion. The findings show a significant performance gain in incast scenarios, achieving up to 140%.

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Enhancing TCP Throughput with Instant Queue Length-based ECN and Dequeue Marking Techniques

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  1. 吳柏均

  2. AboutThisPaper • ShowtheproperlytunedinstantqueuelengthbasedECNatswitches • UseDequeuemaskingonECNandDCTCP

  3. ECN • ExplicitCongestionNotification • IncomingpacketswillbemarkedCEinsteadofdropped.

  4. DCTCP • Instantqueuelengthinsteadofaveragequeuelength • CutsthecongestionwindowinproportiontotheratioofCEmarking.

  5. ECN*

  6. ECN*:instantqueuelengthbasedECN • UseinstantqueuelengthandsinglethresholdinECN • WellsupportbycommodityECN-capableswitches. • Twothresholds:setthesamevalue. • Averagequeuelength:set1. • ECNatend-serversfollowstheECNstandard

  7. LowerboundofECN* • Goal: TCPthroughputperformancewon’tbeaffectedafterthecongestionwindowsreductionbyECN • Thequeuelengthshouldneverbe0

  8. UpperBoundofECN* • Goal:effectively controlled to avoid buffer overflow. • In other words, when the ECN* threshold is lower than the upper bound, there is no TCP packet loss.

  9. RTTinDCnetwork • ThethresholdforECN* relatetoBDP(TxC),sowehaveinterestonRTT • 90%ofconnectionRTTlowerthan400us • BDP=TxC=1G*400us=50KB(~33MTU)

  10. PerformanceofDCTCPandECN*

  11. DequeueMarking

  12. ProblemStatement • 1.Allcompetingflowarelongflows • 2.Afewshortflowtrytodeliverdatafast,whiletherearesomebackgroundlongflows • 3.DuringTCPincast,largenumberofshortflowarecompetingforaportinaveryshorttime.

  13. DequeueMarking • CEinformationmustwaituntilthemarkedpacketmovetotheheadofqueue. • ItisnotEfficientenough!!

  14. IncastPerformance

  15. Interactionoflongflowsandshowflows

  16. Longflowswithlargelatency

  17. Conclustion • ECN* canachievesasimilarperformancecomparetoDCTCP • DequeuemarkingiseffectiveforincreasingthemaximumincastsendersclosetotheperformancelimitofECN,achievingagainform16%to140%

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