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Achieving end-to-end delay bounds by EDF scheduling without traffic shaping

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3 Author(s)
Zhu, K. ; Amber Networks, Fremont, CA, USA ; Zhuang, Y. ; Viniotis, Y.

Earliest deadline first scheduling with per-node traffic shaping (RC-EDF) has the largest schedulable region among all practical policies known today and has been considered a good solution for providing end-to-end packet delay bounds. In order to harness the traffic burstiness inside a network to satisfy the schedulability condition of EDF, per-node traffic shaping has been believed to be necessary. However, shaping introduces artificial packet delays. We show that by deadline assignments at each node that are strict time-shifting of the source packet arrival times, the functionality of shaping can be implicitly realized; the resulting schedulable region of the new scheduling policy is as large as that of RC-EDF. We name the new policy deadline-curve based EDF (DC-EDF). Not only working in a natural work-conserving way, when the global schedulability condition fails DC-EDF will also work in a “best-effort” way to allow packets excessively delayed at previous nodes to catch up and meet the end-to-end delay bounds. Therefore, DC-EDF is likely to provide “tight” statistical delay bounds. We also prove that a known EDF policy without traffic shaping also has a schedulable region as large as that of RC-EDF

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INFOCOM 2001. Twentieth Annual Joint Conference of the IEEE Computer and Communications Societies. Proceedings. IEEE  (Volume:3 )

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