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QoS Control Mechanism Based on Real-Time Measurement of Elephant Flows
Rie HAYASHI Takashi MIYAMURA Eiji OKI Kohei SHIOMOTO
Publication
IEICE TRANSACTIONS on Communications
Vol.E90-B
No.8
pp.2081-2089 Publication Date: 2007/08/01 Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.8.2081 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Network Keyword: elephant flow, congestion control, real-time control,
Full Text: PDF(1.8MB)>>
Summary:
This proposes a scalable QoS control scheme, called Elephant Flow Control Scheme (EFCS) for high-speed large-capacity networks; it controls congestion and provides appropriate bandwidth to normal users' flows by controlling just the elephant flows. EFCS introduces a sampling packet threshold and drops packets considering flow size. EFCS also adopts a compensation parameter to control elephant flows to an appropriate level. Numerical results show that the sampling threshold increases control accuracy by 20% while reducing the amount of memory needed for packet sampling by 60% amount of memory by packet sampling; the elephant flows are controlled as intended by the compensation parameter. As a result, EFCS provides sufficient bandwidth to normal TCP flows in a scalable manner.
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