[Cake] Query on ACK

Dave Taht dave.taht at gmail.com
Fri May 8 11:40:50 EDT 2020

acks at the time you have reached a point of dropping them
significantly have filled the pipe, also.

What I saw here was that the first flow to really get going, and
really get dropped, dominated over the others,
because I thought it was consistently ending up in the priority queue.


Look, all I'm proposing is this idea be tried and tested. Cynically...
since there's a new model coming out as
the result of this work, it immediately turns into something a good
paper can hing on.

On Fri, May 8, 2020 at 8:20 AM Jonathan Morton <chromatix99 at gmail.com> wrote:
> >> The ACK filter runs on enqueue, so if a queue has only ACKs in it, it
> >> will never accumulate anything in the first place...
> >
> > but the side effect is that on dequeue, it flips it into the fast
> > queue drr rotation, not the slow, so it can't accumulate
> > as many acks before delivering the one it has left.
> >
> > Or so I thought, way back when....
> The ack filter converts a stream of acks that might be treated as a bulk flow into a sparse flow, which is delivered promptly.  This is a good thing; an ack should not be held back solely to see whether another one will arrive.
> I think of it as an optimisation to reduce delay of the information in the ack stream, not solely as a way to reduce the bandwidth consumed by the ack stream; the latter is a happy side effect.
>  - Jonathan Morton

Make Music, Not War

Dave Täht
CTO, TekLibre, LLC
Tel: 1-831-435-0729

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