Jitter controlled WFQ algorithm on network processors and latency constrained hardware
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United States of America Patent
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Aug 19, 2008
Grant Date -
Jul 13, 2006
app pub date -
Jan 11, 2005
filing date -
Jan 11, 2005
priority date (Note) -
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Abstract
Systems and methods of reducing service jitter in WFQ scheduling schemes used in packet traffic management are described. Service jitter is the variance in time between when a queue should have been selected for servicing and when it was actually serviced. The service jitter is generally not a problem in lower speed applications but in a high speed implementation such as a OC192 device latency can lead to downstream service contract violations. According to the invention jitter is controlled by applying a dampening factor to a difference amount that is used by the WFQ process to adjust its timing of queue selection. The difference amount is queue-specific and is a running difference between calculated and actual queue servicing times.
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