[Bloat] when does the CoDel part of fq_codel help in the real world?

Michael Welzl michawe at ifi.uio.no
Tue Nov 27 16:20:58 EST 2018

Just a small clarification:

>> To me the switch to head dropping essentially killed the tail loss RTO
>> problem, eliminated most of the need for ecn.
> I doubt that: TCP will need to retransmit that packet at the head, and that takes an RTT - all the packets after it will need to wait in the receiver buffer before the application gets them.
> But I don’t have measurements to prove my point, so I’m just hand-waving…

I don’t doubt that this kills the tail loss RTO problem.
I doubt that it eliminates the need for ECN.


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