Re: [tsvwg] I-D Action: draft-ietf-tsvwg-nqb-08.txt

[Greg White <[e-mail]>]

All,

In addition to a couple of minor wordsmithing edits, this update includes the following changes:

1. Indicates that it "Updates: rfc8325"
2. Includes a clarification that one of the SHOULD statements applies to RFC8325 equipment
3. Moves the text on safeguards for legacy WiFi up into a new subsection that is generalized to also cover unmanaged networks that happen to implement IP Precedence.

In looking back at the mailing list just now, I realized that I did not address Bob Briscoe's comment: 
https://mailarchive.ietf.org/arch/msg/tsvwg/ntGanYqcGP8GqlgzCPSQ1W6rg1U/

Apologies for that. 

His suggestion was to replace:

"If the application's traffic exceeds more than a few packets per RTT, or exceeds approximately 1 Mbps on an instantaneous (inter-packet) basis, the application SHOULD NOT mark its traffic with the NQB DSCP."

With something along the lines of:

"If the application's traffic exceeds a single digit percentage of the global average access link capacity at the time, the application SHOULD NOT mark its traffic with the NQB DSCP.  At the time of writing this document, the global average access link capacity is 63 Mbps down and 13 Mbps up for mobile networks, 113 Mbps down and 62 Mbps up for fixed networks [REF https://www.speedtest.net/global-index or some other reference]."

His rationale can be found in the mailing list posting linked above.

I'm interested in opinions on this, as well as suggestions on the wording.

-Greg



On 10/25/21, 5:09 PM, "tsvwg on behalf of [e-mail]" <[e-mail] on behalf of [e-mail]> wrote:


    A New Internet-Draft is available from the on-line Internet-Drafts directories.
    This draft is a work item of the Transport Area Working Group WG of the IETF.

            Title           : A Non-Queue-Building Per-Hop Behavior (NQB PHB) for Differentiated Services
            Authors         : Greg White
                              Thomas Fossati
    	Filename        : draft-ietf-tsvwg-nqb-08.txt
    	Pages           : 20
    	Date            : 2021-10-25

    Abstract:
       This document specifies properties and characteristics of a Non-
       Queue-Building Per-Hop Behavior (NQB PHB).  The purpose of this NQB
       PHB is to provide a separate queue that enables smooth, low-data-
       rate, application-limited traffic flows, which would ordinarily share
       a queue with bursty and capacity-seeking traffic, to avoid the
       latency, latency variation and loss caused by such traffic.  This PHB
       is implemented without prioritization and without rate policing,
       making it suitable for environments where the use of either these
       features may be restricted.  The NQB PHB has been developed primarily
       for use by access network segments, where queuing delays and queuing
       loss caused by Queue-Building protocols are manifested, but its use
       is not limited to such segments.  In particular, applications to
       cable broadband links, Wi-Fi links, and mobile network radio and core
       segments are discussed.  This document recommends a specific
       Differentiated Services Code Point (DSCP) to identify Non-Queue-
       Building flows.


    The IETF datatracker status page for this draft is:
    https://datatracker.ietf.org/doc/draft-ietf-tsvwg-nqb/

    There is also an HTML version available at:
    https://www.ietf.org/archive/id/draft-ietf-tsvwg-nqb-08.html

    A diff from the previous version is available at:
    https://www.ietf.org/rfcdiff?url2=draft-ietf-tsvwg-nqb-08


    Internet-Drafts are also available by anonymous FTP at:
    ftp://ftp.ietf.org/internet-drafts/