From: Brian Trammell <ietf@trammell.ch>
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Date: Sun, 29 Nov 2015 14:55:48 +0100
References: <4AF73AA205019A4C8A1DDD32C034631D0F2B258821@NJFPSRVEXG0.research.att.com>
To: ippm@ietf.org
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Subject: [ippm] =?utf-8?q?Fwd=3A_New_Liaison_Statement=2C_=22LS_-_Reply_to?=
 =?utf-8?q?_ITU-T_SG11_relevant_activities_on_=E2=80=9CInternet_Speed_Meas?=
 =?utf-8?q?urements=E2=80=9D_=28reply_to_SG11-LS91=29_=22?=
Precedence: list


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Greetings, IPPM WG,

Please find attached a draft reply to the liaison from ITU-T SG12 of =
last week, graciously written by Al Morton, underscoring the WG's work =
on fixing issues with using TCP to measure TCP throughput =
(model-based-metrics).

We intend to send this soon; please post any comments to the list.

Cheers,

Brian (as IPPM co-chair)


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Following reception of:=0D
>>> Title: LS - Reply to ITU-T SG11 relevant activities on =E2=80=9CIntern=
et =0D
>>> Speed Measurements=E2=80=9D (reply to SG11-LS91) Submission Date: =
2015-11-24 =0D
>>> URL of the IETF Web page: https://datatracker.ietf.org/liaison/1444/=0D=

=0D
(Proposed) Liaison Reply to ITU-T SG 12, SG 11, and TSAG=0D
=0D
The IP Performance Metrics (IPPM) working group of the IETF=0D
appreciates the opportunity to comment on methods intending=0D
to measure Internet Speed, such as those described in the =0D
attachments to your liaison (originating in SG 11).  This is=0D
one of the topics which IPPM was chartered to address, and it=0D
has proven more difficult than originally thought.=0D
=0D
The cited proposals for International Recommendations =0D
depend on the assumption that TCP-based measurements can meet=0D
requirements for standardized metrics, in terms of applicability=0D
to subpaths as well as end-to-end paths, and repeatability=0D
across independent implementations or measurement systems. =0D
IPPM's current work in progress (see reference below) =0D
describes why a TCP-based approach would be unsuccessful,=0D
due to the properties of TCP's control loop (see sections 4.0=0D
and 4.1 of the reference below for many more details).=0D
IPPM is currently pursuing methods of measurement which avoid=0D
TCP's control loop, and retain the ability to measure subpaths=0D
and complete paths in a repeatable way. =0D
=0D
IPPM urges all members of the measurement and testing community=0D
to carefully consider our findings and experience with =0D
capacity measurement, and to join our work in IETF to specify =0D
methods of measurement that avoid the pitfalls of TCP-based=0D
testing. =0D
=0D
Referenced Work-in-progress:=0D
https://tools.ietf.org/html/draft-ietf-ippm-model-based-metrics-07=0D
Specific sections cited above:=0D
=
https://tools.ietf.org/html/draft-ietf-ippm-model-based-metrics-07#section=
-4=0D

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