Does Peplink have plans to implement Active Queue Management in 2019?
Steve wrote “From our internal test result quite some time ago, fq_codel alone is just not enough for a dynamic environment, like a cellular connection.” Would Cake, the successor to fq_codel and which is now quite stable, take care of the issues you ran into? And is the version of Linux which Peplink is currently based on 4.4 or greater which apparently makes Cake installation straightforward?
If AQM isn’t scheduled for 2019, is there any possibility Peplink would consider adding fq_codel in 2019? It works well in many situations, raising Speed test - how fast is your internet? | DSLReports, ISP Information results to a grade of “A” for cable, fiber and DSL. As it is not unusual for routers to support multiple AQM choices, Peplink can add a more sophisticated AQM or two in the future. Fq_codel is built into Linux so it should only take adding configuration of fq_codel into the Peplink GUI.
The following (4 year old) article has a good summary of what is better about Cake than fq_codel: Cake - Bufferbloat.net.
The benefits include (taken from other articles):
“A major enhancement in Cake over fq_codel is replacement of the plain hash function with an 8-way set-associative version. Plain hashes are susceptible to the ‘birthday problem’ in which the probability of hash collision reaches 50% when the table occupancy reaches the square root of the table size (32 flows for 1024 queues), assuming a high-quality hash; we have also found that the hash function fq_codel relies on is suboptimal.”
The “Nat” option “Instructs Cake to perform a NAT lookup before applying flow-isolation rules, to determine the true addresses and port numbers of the packet, to improve fairness between hosts ‘inside’ the NAT.”
“One of the good things cake does … is that it reduces superpackets (GRO offloads mainly) to their packets which does wonders (vs fq_codel) to hold latencies stable.”
Fall back to dropping a packet if necessary for congestion control if ECN not working.