Bandwidth Issues White Papers
Intelligent Packet Discard Policies for Improved TCP Queue Management
Overview Recent studies have shown that suitably-designed packet discard policies can dramatically improve the performance of fair queueing mechanisms in internet routers. The Queue State Deficit Round Robin algorithm (QSDRR) preferentially discards from long queues, but introduces hysteresis into the discard policy to minimize synchronization among TCP flows. QSDRR provides higher throughput and much better fairness than simpler queueing mechanisms, such as Tail-Drop, RED and Blue. However, because QSDRR discards packets that have previously been queued, it can significantly increase the memory bandwidth requirements of high performance routers. This paper explores alternatives to QSDRR that provide comparable performance, while allowing packets to be discarded on arrival, saving memory bandwidth.
| Publisher | Washington University in St. Louis | File Format | |
|---|---|---|---|
| Date Published | January 2007 | ||
| Format | White Papers | ||
| Topics | |||
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