Tackling Bufferbloat in Capacity-limited Networks

Chamil Premantha Weerasinghe Kulatunga, Nicolas Kuhn, Gorry Fairhurst, D Ros

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

12 Citations (Scopus)


Over-provisioned network buffers, often at the Internet edge, induce large queuing delay and high latency; this issue is known as Bufferbloat. In response to this, a set of recently proposed Active Queue Management (AQM) algorithms attempt to reduce standing queues, while maintaining the bottleneck utilisation at an acceptable level. This paper assesses the performance of two AQM schemes (CoDel and FQ-CoDel) over capacity-limited networks with large Round-Trip Time (RTT). In such settings, these AQM schemes have trouble in controlling the queuing delay, resulting in both momentarily high queuing delay and low bottleneck utilisation, even if they are claimed to be insensitive to link rates and round-trip delays. We show that it is possible to adapt the parameterisation of CoDel and FQ-CoDel to offer a higher bottleneck utilisation while maintaining a low queuing delay. We run experiments over an emulated test bed and a satellite network to confirm that our new parameterisation improves the downloading time of moderate-size files and reduces the latency for capacity-limited and large-RTT networks.
Original languageEnglish
Title of host publication2015 European Conference on Networks and Communications
Subtitle of host publicationTrack 4- Networking (NET)
PublisherIEEE Press
Number of pages6
ISBN (Electronic)978-1-4673-7359-3
ISBN (Print)978-1-4673-7358-6
Publication statusPublished - 29 Jun 2015
EventEuropean Conference On Networks And Communications (EuCNC) - Paris, France
Duration: 29 Jun 20152 Jul 2015


ConferenceEuropean Conference On Networks And Communications (EuCNC)


  • CoDel
  • AQM
  • Bufferbloat
  • Rural Broadband


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