Hello AQMers: Just wanted to bring up the following item for discussion either as part of the recommendations draft or the evaluation criteria during Friday's session/mailing list.
In access, edge and core routers the draining rate of a queue is affected by traffic on other queues and thus can vary a lot (depending on the deployment and traffic conditions). A queue length based AQM scheme such as RED or derivatives tries to maintain the average queue size around a predictable value under these changing draining rates. However, this queue size translates to high queuing delay under low draining rates and vice-versa. The unpredictability in resulting queueing delay was one of the reasons why we opted PIE to be a latency-based scheme. A queue length based AQM scheme could be perfectly valid for certain deployments. For deployments where predictable queuing delay is expected under varying draining rates, a latency based AQM is critical. We believe this should be brought about in discussions somewhere at AQM perhaps in the recommendations draft or w.r.t evaluation criteria. Thanks, Preethi (on behalf of PIE team)
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