Active Queue Management (AQM) Based on Proportional Integral Controller Enhanced (PIE) for Data-Over-Cable Service Interface Specifications (DOCSIS) Cable Modems
draft-ietf-aqm-docsis-pie-02

[Ballot comment]
For my own edification I assume that the latency target is expected to fall within

  o  LATENCY_LOW = 5 ms

  o  LATENCY_HIGH = 200 ms.

but presumably it's most usable at the bottom end of that range?

why is the lower bound at 5ms? is it simply unreasonable to target below that or is it bounded by the resource contention of the subscribers.

(Via drafts-lastcall-comment@iana.org): IESG/Authors/WG Chairs:

IANA has reviewed draft-ietf-aqm-docsis-pie-02.txt, which is currently in Last Call, and has the following comments:

We understand that this document doesn't require any IANA actions.

While it's often helpful for a document's IANA Considerations section to remain in place upon publication even if there are no actions, if the authors strongly prefer to remove it, IANA does not object.

If this assessment is not accurate, please respond as soon as possible.

Thank you,

Sabrina Tanamal
IANA Specialist
ICANN

The following Last Call announcement was sent out:

From: The IESG
To: "IETF-Announce"
CC: wes@mti-systems.com, "Wesley Eddy" , aqm-chairs@ietf.org, mls.ietf@gmail.com, draft-ietf-aqm-docsis-pie@ietf.org, aqm@ietf.org
Reply-To: ietf@ietf.org
Sender:
Subject: Last Call:  (A PIE-Based AQM for DOCSIS Cable Modems) to Informational RFC


The IESG has received a request from the Active Queue Management and
Packet Scheduling WG (aqm) to consider the following document:
- 'A PIE-Based AQM for DOCSIS Cable Modems'
  as Informational RFC

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the
ietf@ietf.org mailing lists by 2016-03-15. Exceptionally, comments may be
sent to iesg@ietf.org instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.

Abstract


  Cable modems based on the DOCSIS(R) specification provide broadband
  Internet access to over one hundred million users worldwide.  In some
  cases, the cable modem connection is the bottleneck (lowest speed)
  link between the customer and the Internet.  As a result, the impact
  of buffering and bufferbloat in the cable modem can have a
  significant effect on user experience.  The CableLabs DOCSIS 3.1
  specification introduces requirements for cable modems to support an
  Active Queue Management (AQM) algorithm that is intended to alleviate
  the impact that buffering has on latency sensitive traffic, while
  preserving bulk throughput performance.  In addition, the CableLabs
  DOCSIS 3.0 specifications have also been amended to contain similar
  requirements.  This document describes the requirements on Active
  Queue Management that apply to DOCSIS equipment, including a
  description of the "DOCSIS-PIE" algorithm that is required on DOCSIS
  3.1 cable modems.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-aqm-docsis-pie/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-aqm-docsis-pie/ballot/


No IPR declarations have been submitted directly on this I-D.

As required by RFC 4858, this is the current template for the Document
Shepherd Write-Up.

Changes are expected over time. This version is dated 24 February 2012.

(1) What type of RFC is being requested (BCP, Proposed Standard,
Internet Standard, Informational, Experimental, or Historic)?  Why
is this the proper type of RFC?  Is this type of RFC indicated in the
title page header?

Informational.  This is the proper document type because it represents work done outside the IETF.


(2) The IESG approval announcement includes a Document Announcement
Write-Up. Please provide such a Document Announcement Write-Up. Recent
examples can be found in the "Action" announcements for approved
documents. The approval announcement contains the following sections:

Technical Summary

  Relevant content can frequently be found in the abstract
  and/or introduction of the document. If not, this may be
  an indication that there are deficiencies in the abstract
  or introduction.

From abstract:
  Cable modems based on the DOCSIS(R) specification provide broadband
  Internet access to over one hundred million users worldwide.  In some
  cases, the cable modem connection is the bottleneck (lowest speed)
  link between the customer and the Internet.  As a result, the impact
  of buffering and bufferbloat in the cable modem can have a
  significant effect on user experience.  The CableLabs DOCSIS 3.1
  specification introduces requirements for cable modems to support an
  Active Queue Management (AQM) algorithm that is intended to alleviate
  the impact that buffering has on latency sensitive traffic, while
  preserving bulk throughput performance.  In addition, the CableLabs
  DOCSIS 3.0 specifications have also been amended to contain similar
  requirements.  This document describes the requirements on Active
  Queue Management that apply to DOCSIS equipment, including a
  description of the "DOCSIS-PIE" algorithm that is required on DOCSIS
  3.1 cable modems.


Working Group Summary

  Was there anything in WG process that is worth noting? For
  example, was there controversy about particular points or
  were there decisions where the consensus was particularly
  rough?

There were no extraordinary events in the WG process on this document.


Document Quality

  Are there existing implementations of the protocol? Have a
  significant number of vendors indicated their plan to
  implement the specification? Are there any reviewers that
  merit special mention as having done a thorough review,
  e.g., one that resulted in important changes or a
  conclusion that the document had no substantive issues? If
  there was a MIB Doctor, Media Type or other expert review,
  what was its course (briefly)? In the case of a Media Type
  review, on what date was the request posted?

The document quality is high.  Implementations would likely be done from the DOCSIS spec itself rather than this document, which is really just tying together the IETF AQM work with what has been completed earlier in the DOCSIS specifications.


Personnel

  Who is the Document Shepherd? Who is the Responsible Area
  Director?

Wesley Eddy (wes@mti-systems.com) is the shepherd and Martin Stiemerling (mls.ietf@gmail.com) is the AD.


(3) Briefly describe the review of this document that was performed by
the Document Shepherd.  If this version of the document is not ready
for publication, please explain why the document is being forwarded to
the IESG.


I have reviewed the document multiple times, and it is ready for publication.


(4) Does the document Shepherd have any concerns about the depth or
breadth of the reviews that have been performed?

No concerns.


(5) Do portions of the document need review from a particular or from
broader perspective, e.g., security, operational complexity, AAA, DNS,
DHCP, XML, or internationalization? If so, describe the review that
took place.

No.


(6) Describe any specific concerns or issues that the Document Shepherd
has with this document that the Responsible Area Director and/or the
IESG should be aware of? For example, perhaps he or she is uncomfortable
with certain parts of the document, or has concerns whether there really
is a need for it. In any event, if the WG has discussed those issues and
has indicated that it still wishes to advance the document, detail those
concerns here.

No concerns.


(7) Has each author confirmed that any and all appropriate IPR
disclosures required for full conformance with the provisions of BCP 78
and BCP 79 have already been filed. If not, explain why.

Yes.


(8) Has an IPR disclosure been filed that references this document?
If so, summarize any WG discussion and conclusion regarding the IPR
disclosures.

Not directly on this document.  The document builds upon and references draft-ietf-aqm-pie, for which there is an IPR declaration.  I confirmed with the editors that there is no additional IPR specific to this document.


(9) How solid is the WG consensus behind this document? Does it
represent the strong concurrence of a few individuals, with others
being silent, or does the WG as a whole understand and agree with it? 

The WG understands this document and has consensus to publish.


(10) Has anyone threatened an appeal or otherwise indicated extreme
discontent? If so, please summarise the areas of conflict in separate
email messages to the Responsible Area Director. (It should be in a
separate email because this questionnaire is publicly available.)

No.


(11) Identify any ID nits the Document Shepherd has found in this
document. (See https://www.ietf.org/tools/idnits/ and the Internet-Drafts
Checklist). Boilerplate checks are not enough; this check needs to be
thorough.

The draft contains psuedocode, for which there is a spurious idnits warning about code.


(12) Describe how the document meets any required formal review
criteria, such as the MIB Doctor, media type, and URI type reviews.

Not applicable.


(13) Have all references within this document been identified as
either normative or informative?

Yes.


(14) Are there normative references to documents that are not ready for
advancement or are otherwise in an unclear state? If such normative
references exist, what is the plan for their completion?

No.


(15) Are there downward normative references references (see RFC 3967)?
If so, list these downward references to support the Area Director in
the Last Call procedure.

Not applicable (this is Informational).


(16) Will publication of this document change the status of any
existing RFCs? Are those RFCs listed on the title page header, listed
in the abstract, and discussed in the introduction? If the RFCs are not
listed in the Abstract and Introduction, explain why, and point to the
part of the document where the relationship of this document to the
other RFCs is discussed. If this information is not in the document,
explain why the WG considers it unnecessary.

No changes to existing RFCs.


(17) Describe the Document Shepherd's review of the IANA considerations
section, especially with regard to its consistency with the body of the
document. Confirm that all protocol extensions that the document makes
are associated with the appropriate reservations in IANA registries.
Confirm that any referenced IANA registries have been clearly
identified. Confirm that newly created IANA registries include a
detailed specification of the initial contents for the registry, that
allocations procedures for future registrations are defined, and a
reasonable name for the new registry has been suggested (see RFC 5226).

There are no IANA considerations.


(18) List any new IANA registries that require Expert Review for future
allocations. Provide any public guidance that the IESG would find
useful in selecting the IANA Experts for these new registries.

Not applicable.


(19) Describe reviews and automated checks performed by the Document
Shepherd to validate sections of the document written in a formal
language, such as XML code, BNF rules, MIB definitions, etc.

Not applicable.

We should be completing shepherd write-up and confirming IPR within next week.

The PIE spec still in WGLC can continue to be worked on in parallel, but this document appears to be ready.