Pre-Congestion Notification (PCN) Architecture
draft-ietf-pcn-architecture-11
Discuss
Yes
(Lars Eggert)
No Objection
(Chris Newman)
(Cullen Jennings)
(Dan Romascanu)
(Magnus Westerlund)
(Mark Townsley)
(Pasi Eronen)
(Ron Bonica)
(Ross Callon)
Note: This ballot was opened for revision 11 and is now closed.
David Ward Former IESG member
Discuss
Discuss
[Treat as non-blocking comment]
(2009-02-24)
Unknown
This idea appears to have the issue that if the variance introduced by new sessions coming on exceeds the tolerance in the marking zone (eg, if there is plenty of capacity for one HDTV stream but not enough for two, and someone turns on a second TV while the first is watching a show), that can impact the application in the existing channel. The simulations have tested the ability of the system to operate when properly operated and properly configured; they have not seriously considered avalanche scenarios. Avalanche scenarios are a variation of the "mother's day" problem, on a millisecond time scale; in real time applications such as voice and especially video it is possible to outrun an essentially infinite bandwidth pool during short time scales. Consider concerns with realtime video conferencing and the very careful planning to ensure that the network can handle that class of traffic - on a 45 MBPS link with three data streams that nominally run 5 MBPS standing and ~12 MBPS at peaks (I-frame). There are demonstrated issues in picture quality due to conniption fits in the network and as a result force more careful traffic pacing. I think this is fine in parts of the network where avalanche scenarios are unusual but, that has to be clearly stated and that the idea does not work in other use cases.
Lars Eggert Former IESG member
Yes
Yes
()
Unknown
Adrian Farrel Former IESG member
(was Discuss)
No Objection
No Objection
(2009-04-03)
Unknown
Clearing my Discuss now I have found Section 12.3. Can I suggest that you rebrand sections 12 and 13 not as appendixes. Also that you so not use the first person plural in the text of secition 12. I think the RFC is supposed to represent at least WG consensus and so the first person is a little ambiguous.
Chris Newman Former IESG member
No Objection
No Objection
()
Unknown
Cullen Jennings Former IESG member
(was Discuss)
No Objection
No Objection
()
Unknown
Dan Romascanu Former IESG member
(was Discuss)
No Objection
No Objection
()
Unknown
Magnus Westerlund Former IESG member
No Objection
No Objection
()
Unknown
Mark Townsley Former IESG member
No Objection
No Objection
()
Unknown
Pasi Eronen Former IESG member
(was Discuss)
No Objection
No Objection
()
Unknown
Ron Bonica Former IESG member
(was Discuss)
No Objection
No Objection
()
Unknown
Ross Callon Former IESG member
(was Discuss)
No Objection
No Objection
()
Unknown
Russ Housley Former IESG member
No Objection
No Objection
(2009-02-23)
Unknown
The Gen-ART Review by Francis Dupont on 2009-02-23 provides many minor suggestions. Please review them.