[tsvwg] Technical discussion 4 of draft-ietf-tsvwg-aqm-dualq-coupled-08

[David Pullen <[e-mail]>]

Hi Bob,

In section 2.5.2:

Total packets arriving, enqueued and dequeued to distinguish tail discard
from proactive AQM discard;

It isn't clear to me how one distinguishes between tail discard and AQM
discard with these counters.

If a packet is tail discarded, is "packets arriving" incremented? Or do the
counters not get incremented at all for tail discard?

If a packet is AQM discarded, are "packets arriving" and "packets enqueued"
incremented?

Some AQM implementations may implement AQM discard at the head of the
queue, and others may implement AQM discard at the tail of the queue. The
counters should be defined such that any differences in implementation
still yield the same results in terms of counter state.

Thanks,
  - Dave

David Pullen
Distinguished Engineer  |  Wired Networking, Cable Modems
Broadcom

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