[Bloat] The Dark Problem with AQM in the Internet?

[Jerry Jongerius]

> did you check to see if packets were re-sent even if they weren't lost? on
of
> the side effects of excessive buffering is that it's possible for a packet
to
> be held in the buffer long enough that the sender thinks that it's been
> lost and retransmits it, so the packet is effectivly 'lost' even if it
actually
> arrives at it's destination.

Yes.  A duplicate packet for the missing packet is not seen.

The receiver 'misses' a packet; starts sending out tons of dup acks (for all
packets in flight and queued up due to bufferbloat), and then way later, the
packet does come in (after the RTT caused by bufferbloat; indicating it is
the 'resent' packet).