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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the TCP Maintenance and Minor Extensions Working Group of the IETF.

        Title           : Retransmission Timeout Considerations
        Author          : Mark Allman
	Filename        : draft-ietf-tcpm-rto-consider-00.txt
	Pages           : 7
	Date            : 2016-02-02

Abstract:
    Each implementation of a retransmission timeout mechanism must
    balance correctness and timeliness and therefore no implementation
    suits all situations.  This document provides high-level guidance
    for retransmission timeout schemes appropriate for general use in
    the Internet.  Within the guidelines, implementations have latitude
    to define particulars that best address each situation.

Terminology

The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rto-consider/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-tcpm-rto-consider-00


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

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From: "Scharf, Michael (Nokia - DE)" <michael.scharf@nokia.com>
To: "tcpm@ietf.org Extensions" <tcpm@ietf.org>
Thread-Topic: I-D Action: draft-ietf-tcpm-rto-consider-00.txt
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Since it has been suggested to move this short document forward relatively =
fast, please have look at this new version.

With chair hat off: To me, the sentence on page 5 "In such a case a congest=
ion control action is not required." does not really cover an undo of conge=
stion control actions once a non-congestion event is detected. But this may=
 really be nitpicking...

Thanks

Michael



-----Original Message-----
From: I-D-Announce [mailto:i-d-announce-bounces@ietf.org] On Behalf Of EXT =
internet-drafts@ietf.org
Sent: Tuesday, February 02, 2016 3:02 PM
To: i-d-announce@ietf.org
Cc: tcpm@ietf.org
Subject: I-D Action: draft-ietf-tcpm-rto-consider-00.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
 This draft is a work item of the TCP Maintenance and Minor Extensions Work=
ing Group of the IETF.

        Title           : Retransmission Timeout Considerations
        Author          : Mark Allman
	Filename        : draft-ietf-tcpm-rto-consider-00.txt
	Pages           : 7
	Date            : 2016-02-02

Abstract:
    Each implementation of a retransmission timeout mechanism must
    balance correctness and timeliness and therefore no implementation
    suits all situations.  This document provides high-level guidance
    for retransmission timeout schemes appropriate for general use in
    the Internet.  Within the guidelines, implementations have latitude
    to define particulars that best address each situation.

Terminology

The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rto-consider/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-tcpm-rto-consider-00


Please note that it may take a couple of minutes from the time of submissio=
n until the htmlized version and diff are available at tools.ietf.org.

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

_______________________________________________
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Michael-

> To me, the sentence on page 5 "In such a case a congestion control
> action is not required." does not really cover an undo of
> congestion control actions once a non-congestion event is
> detected. But this may really be nitpicking...

I am not sure I understand what you mean.

The full text says:

    (4) Retransmission timeouts MUST be taken as indications of
        congestion in the network and the sending rate adapted using a
        standard mechanism (e.g., TCP collapses the congestion window to
        one segment [RFC5681]).

        This ensures network safety.

        An exception is made to this rule if a standard mechanism is
        used to determine that a particular loss is due to a
        non-congestion event (e.g., bit errors or packet reordering).
        In such a case a congestion control action is not required.


Would you prefer this just explicitly notes that undo-ing CC
decisions (via a standard mechanism) is fine?  In other words, is
your comment that the language focuses too much on the initial
decision and not a later decision that might reverse course?

I am happy to try to make things more clear, but I don't quite
follow what isn't clear yet.

Thanks!

allman




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From nobody Thu Feb  4 05:06:16 2016
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From: "Scharf, Michael (Nokia - DE)" <michael.scharf@nokia.com>
To: "mallman@icir.org" <mallman@icir.org>
Thread-Topic: [tcpm] FW: I-D Action: draft-ietf-tcpm-rto-consider-00.txt 
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Yes, I think that a slightly different wording that also includes a later d=
ecision could be better. Possibly one could just add something like "... an=
d could be undone".

Anyway, as I said, this may really be nitpicking - and I am not a native sp=
eaker.

Michael



-----Original Message-----
From: mallman@icir.org [mailto:mallman@icir.org]=20
Sent: Thursday, February 04, 2016 1:58 PM
To: Scharf, Michael (Nokia - DE)
Cc: tcpm@ietf.org Extensions
Subject: Re: [tcpm] FW: I-D Action: draft-ietf-tcpm-rto-consider-00.txt=20


Michael-

> To me, the sentence on page 5 "In such a case a congestion control=20
> action is not required." does not really cover an undo of congestion=20
> control actions once a non-congestion event is detected. But this may=20
> really be nitpicking...

I am not sure I understand what you mean.

The full text says:

    (4) Retransmission timeouts MUST be taken as indications of
        congestion in the network and the sending rate adapted using a
        standard mechanism (e.g., TCP collapses the congestion window to
        one segment [RFC5681]).

        This ensures network safety.

        An exception is made to this rule if a standard mechanism is
        used to determine that a particular loss is due to a
        non-congestion event (e.g., bit errors or packet reordering).
        In such a case a congestion control action is not required.


Would you prefer this just explicitly notes that undo-ing CC decisions (via=
 a standard mechanism) is fine?  In other words, is your comment that the l=
anguage focuses too much on the initial decision and not a later decision t=
hat might reverse course?

I am happy to try to make things more clear, but I don't quite follow what =
isn't clear yet.

Thanks!

allman




From nobody Thu Feb 11 11:12:39 2016
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Subject: [tcpm] RFC 7765 on TCP and Stream Control Transmission Protocol (SCTP) RTO Restart
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 7765

        Title:      TCP and Stream Control Transmission 
                    Protocol (SCTP) RTO Restart 
        Author:     P. Hurtig, A. Brunstrom,
                    A. Petlund, M. Welzl
        Status:     Experimental
        Stream:     IETF
        Date:       February 2016
        Mailbox:    per.hurtig@kau.se, 
                    anna.brunstrom@kau.se, 
                    apetlund@simula.no,
                    michawe@ifi.uio.no
        Pages:      15
        Characters: 35361
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-tcpm-rtorestart-10.txt

        URL:        https://www.rfc-editor.org/info/rfc7765

        DOI:        http://dx.doi.org/10.17487/RFC7765

This document describes a modified sender-side algorithm for managing
the TCP and Stream Control Transmission Protocol (SCTP)
retransmission timers that provides faster loss recovery when there
is a small amount of outstanding data for a connection.  The
modification, RTO Restart (RTOR), allows the transport to restart its
retransmission timer using a smaller timeout duration, so that the
effective retransmission timeout (RTO) becomes more aggressive in
situations where fast retransmit cannot be used.  This enables faster
loss detection and recovery for connections that are short lived or
application limited.

This document is a product of the TCP Maintenance and Minor Extensions Working Group of the IETF.


EXPERIMENTAL: This memo defines an Experimental Protocol for the
Internet community.  It does not specify an Internet standard of any
kind. Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.

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specifically noted otherwise on the RFC itself, all RFCs are for
unlimited distribution.


The RFC Editor Team
Association Management Solutions, LLC


From nobody Wed Feb 17 12:20:49 2016
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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "'gorry@erg.abdn.ac.uk' (gorry@erg.abdn.ac.uk)" <gorry@erg.abdn.ac.uk>
Thread-Topic: RFC7661, more recent Linux patch available ?
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Date: Wed, 17 Feb 2016 20:20:43 +0000
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Subject: [tcpm] RFC7661, more recent Linux patch available ?
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Hi Gorry + others

Is there a recent linux patch availlable for NewCWV (RFC7661) ?.
I found some info at https://erg.abdn.ac.uk/newcwv.html , is this the lates=
t ?

Also, will RFC7661 be included in the Linux kernel in the future?

/Ingemar
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
Ingemar Johansson  M.Sc.
Master Researcher

Ericsson AB
Wireless Access Networks
Labratoriegr=E4nd 11
971 28, Lule=E5, Sweden
Phone +46-1071 43042
SMS/MMS +46-73 078 3289
ingemar.s.johansson@ericsson.com<mailto:ingemar.s.johansson@ericsson.com>
www.ericsson.com

"We can be heroes,
  just for one day"
    David Bowie
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D


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<p class=3D"MsoNormal">Hi Gorry &#43; others<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Is there a recent linux patch a=
vaillable for NewCWV (RFC7661) ?.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I found some info at <a href=3D=
"https://erg.abdn.ac.uk/newcwv.html">
https://erg.abdn.ac.uk/newcwv.html</a> , is this the latest ?<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Also, will RFC7661 be included =
in the Linux kernel in the future?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">/Ingemar<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">Ingemar Johansson&nbsp; M.Sc.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">Master Researcher<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">Ericsson AB<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">Wireless Access Networks<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">Labratoriegr=E4nd 11<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">971 28, Lule=E5, Sweden<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">Phone &#43;46-1071 43042<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV">SMS/MMS &#43;46-73 078 3289<o:p></o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span style=3D"font-si=
ze:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-=
language:SV"><a href=3D"mailto:ingemar.s.johansson@ericsson.com"><span lang=
=3D"EN-US" style=3D"color:blue">ingemar.s.johansson@ericsson.com</span></a>=
</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Ari=
al&quot;,&quot;sans-serif&quot;;mso-fareast-language:SV"><o:p></o:p></span>=
</p>
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ze:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-=
language:SV"><a href=3D"www.ericsson.com"><span lang=3D"EN-US" style=3D"col=
or:blue">www.ericsson.com</span></a></span><span lang=3D"EN-US" style=3D"fo=
nt-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-far=
east-language:SV"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;mso-fareast-language:SV"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;color:black;mso-fareast-language:SV">&#8220;<span style=3D"background:wh=
ite">We can be heroes,<o:p></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span lang=3D"EN-US" s=
tyle=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quo=
t;;color:black;background:white;mso-fareast-language:SV">&nbsp; just for on=
e day</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quo=
t;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-language:SV">&#8221;<span =
style=3D"color:black"><br>
</span>&nbsp;&nbsp;&nbsp; David Bowie <o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span style=3D"font-si=
ze:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From nobody Thu Feb 18 03:55:42 2016
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From: "Scharf, Michael (Nokia - DE)" <michael.scharf@nokia.com>
To: "tcpm@ietf.org Extensions" <tcpm@ietf.org>
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Subject: [tcpm] TCPM slot at IETF 95
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Hi all,

Pasi, Yoshifumi, and me would like to gauge the interest in a face-to-face =
TCPM meeting in Buenos Aires.=20

In the last years, TCPM has traditionally met at every IETF meeting, and th=
e chairs have already requested the usual slot for IETF 95. However, unfort=
unately, right now it is not clear whether any of us chairs will make it to=
 Buenos Aires. Our current assumption is that we will not run into this pro=
blem in the next meetings, and we assume that TCPM will meet as usual durin=
g IETF 96 in Berlin.

Please let us know if you are planning a presentation at IETF 95 that would=
 benefit from a face-to-face TCPM discussion, e.g., if an important decisio=
n is to be made. If so, the chairs will look into how to make this happen.=
=20

Thanks

Michael


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Subject: [tcpm] (Bar) BoF @IETF-95 'Ultra-Low Queuing Delay for All' (L4S, DualQ Coupled AQM, TCP Prague)?
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Folks,

I'm cross-posting 'cos this impacts 3 IETF WGs and interested implementers.

We would like to propose a Bar BoF at the Buenos Aires IETF, about L4S, 
DualQ and solutions to the TCP Prague Requirements.

If you don't know what all these buzzwords mean, pls read 'Background' 
at the end first.
If you don't know what a Bar BoF is, see https://www.ietf.org/tao.html

At least two purposes:
i) Updates so everyone can see progress on design, implementation, 
evaluation, specification of the different parts, who is working on what 
etc.
    Note: You might be working on, say, an improvement to DCTCP without 
being motivated by all this L4S stuff, but it might be relevant.
ii) To discuss how best to standardise all the different parts
iii) Anything else? Perhaps interop testing, but it's probably too early 
for that

Shout now, if you think this should be a real BoF, not just a Bar BoF, 
cos the deadline for BoF proposals is about 11 hrs from now: UTC 23:59 
2016-02-19 (Friday).
Also shout - either on or off list - if you have something relevant you 
would like to present at item (i)

Regarding item (ii) on how best to standardise all this, we've been 
talking with the Transport ADs and relevant WG chairs, and there are two 
possible routes forward:
* Proposal #1: Standardise the pieces in their relevant existing WGs. Ie:
   - the IP packet identifier for the L4S service in tsvwg, e.g. 
<draft-briscoe-tsvwg-ecn-l4s-id 
<https://tools.ietf.org/html/draft-briscoe-tsvwg-ecn-l4s-id>>
   - the AQM mechanism in the aqm wg, e.g. 
<draft-briscoe-aqm-dualq-coupled 
<https://tools.ietf.org/html/draft-briscoe-aqm-dualq-coupled>>
   - The essential TCP Prague requirements 
<https://mailarchive.ietf.org/arch/msg/tcpprague/mwWncQg3egPd15FItYWiEvRDrvA> 
in the tcpm wg (the essential requirements happen to all be applicable 
to regular TCP congestion avoidance as well)
   - The 'optional' TCP Prague requirements 
<https://mailarchive.ietf.org/arch/msg/tcpprague/mwWncQg3egPd15FItYWiEvRDrvA> 
(performance improvements) in perhaps the IRTF iccrg or tcpm, whichever 
is most appropriate.
* Proposal #2: A new WG to do all the above.

Discuss!


*Background**
*Back in July'15, at the IETF AQM wg in Prague, we presented the DualQ 
Coupled AQM. <draft-briscoe-aqm-dualq-coupled 
<https://tools.ietf.org/html/draft-briscoe-aqm-dualq-coupled>>
And we demonstrated it later that week at IETF bits-n-bites exhibition.

The message is, once you partition off the queuing delay of 'Classic' 
TCP congestion control (Reno, Cubic, etc), it's really easy to get 
ultra-low queueing delay with the family of TCPs that includes Data 
Center TCP (DCTCP).

The DCTCP family is more aggressive, so normally they would starve a 
Classic TCP flow. This coexistence problem is why it hasn't so far been 
possible to release DCTCP on the public Internet.
The DualQ solves this coexistence problem. it is like a semi-permeable 
membrane: it partitions delay, but flows share bandwidth across the 
divide as if they are all the same type of TCP.
So, as a fortunate side-effect, DualQ also solves the problem of scaling 
TCP throughput long term. {Note 1}

We are proposing that senders will identify packets for this new L4S 
queue with the ECT(1) codepoint. <draft-briscoe-tsvwg-ecn-l4s-id 
<https://tools.ietf.org/html/draft-briscoe-tsvwg-ecn-l4s-id>>
We call the service offered by this new queue 'L4S' for 'Low Delay, Low 
Loss, Scalable throughput'
DCTCP works OK as it is, but it will need some safety features. There 
was a lot of energy in an ad hoc session in Prague back last July, which 
produced a prioritised list, including performance improvements (see TCP 
Prague Requirements 
<https://mailarchive.ietf.org/arch/msg/tcpprague/mwWncQg3egPd15FItYWiEvRDrvA>) 
but then everyonr went home, went on summer holidays, returned to their 
day jobs and it all went quiet...

If you missed all the above, we've pulled together videos of demos, 
short papers, I-Ds etc here: https://riteproject.eu/dctth/
Incuding this particularly useful 2-pager: “Ultra-Low Delay for All 
<http://www.internetsociety.org/publications/ietf-journal-november-2015/ultra-low-delay-for-all>” 
IETF Journal, Nov 2015.

Cheers


Bob Briscoe & Koen De Schepper

{Note 1} As the window scales, the number of congestion signals per RTT 
remains the same, whereas with classic TCPs it gets smaller.

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


--------------090006030305010904050805
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<html>
  <head>

    <meta http-equiv="content-type" content="text/html; charset=utf-8">
  </head>
  <body text="#000000" bgcolor="#FFFFFF">
    Folks,<br>
    <br>
    I'm cross-posting 'cos this impacts 3 IETF WGs and interested
    implementers.<br>
    <br>
    We would like to propose a Bar BoF at the Buenos Aires IETF, about
    L4S, DualQ and solutions to the TCP Prague Requirements. <br>
    <br>
    If you don't know what all these buzzwords mean, pls read
    'Background' at the end first.<br>
    If you don't know what a Bar BoF is, see
    <a class="moz-txt-link-freetext" href="https://www.ietf.org/tao.html">https://www.ietf.org/tao.html</a><br>
    <br>
    At least two purposes:<br>
    i) Updates so everyone can see progress on design, implementation,
    evaluation, specification of the different parts, who is working on
    what etc.<br>
       Note: You might be working on, say, an improvement to DCTCP
    without being motivated by all this L4S stuff, but it might be
    relevant.<br>
    ii) To discuss how best to standardise all the different parts<br>
    iii) Anything else? Perhaps interop testing, but it's probably too
    early for that<br>
    <br>
    Shout now, if you think this should be a real BoF, not just a Bar
    BoF, cos the deadline for BoF proposals is about 11 hrs from now:
    UTC 23:59 2016-02-19 (Friday).<br>
    Also shout - either on or off list - if you have something relevant
    you would like to present at item (i)<br>
    <br>
    Regarding item (ii) on how best to standardise all this, we've been
    talking with the Transport ADs and relevant WG chairs, and there are
    two possible routes forward:<br>
    * Proposal #1: Standardise the pieces in their relevant existing
    WGs. Ie:<br>
      - the IP packet identifier for the L4S service in tsvwg, e.g. &lt;<a
      href="https://tools.ietf.org/html/draft-briscoe-tsvwg-ecn-l4s-id">draft-briscoe-tsvwg-ecn-l4s-id</a>&gt;<br>
      - the AQM mechanism in the aqm wg, e.g. &lt;<a
      href="https://tools.ietf.org/html/draft-briscoe-aqm-dualq-coupled">draft-briscoe-aqm-dualq-coupled</a>&gt;<br>
      - The essential <a
href="https://mailarchive.ietf.org/arch/msg/tcpprague/mwWncQg3egPd15FItYWiEvRDrvA">TCP
      Prague requirements</a> in the tcpm wg (the essential requirements
    happen to all be applicable to regular TCP congestion avoidance as
    well)<br>
      - The 'optional' <a
href="https://mailarchive.ietf.org/arch/msg/tcpprague/mwWncQg3egPd15FItYWiEvRDrvA">TCP
      Prague requirements</a> (performance improvements) in perhaps the
    IRTF iccrg or tcpm, whichever is most appropriate.<br>
    * Proposal #2: A new WG to do all the above.<br>
    <br>
    Discuss!<br>
    <br>
    <br>
    <b>Background</b><b><br>
    </b>Back in July'15, at the IETF AQM wg in Prague, we presented the
    DualQ Coupled AQM. &lt;<a
      href="https://tools.ietf.org/html/draft-briscoe-aqm-dualq-coupled">draft-briscoe-aqm-dualq-coupled</a>&gt;<br>
    And we demonstrated it later that week at IETF bits-n-bites
    exhibition.<br>
    <br>
    The message is, once you partition off the queuing delay of
    'Classic' TCP congestion control (Reno, Cubic, etc), it's really
    easy to get ultra-low queueing delay with the family of TCPs that
    includes Data Center TCP (DCTCP).<br>
    <br>
    The DCTCP family is more aggressive, so normally they would starve a
    Classic TCP flow. This coexistence problem is why it hasn't so far
    been possible to release DCTCP on the public Internet.<br>
    The DualQ solves this coexistence problem. it is like a
    semi-permeable membrane: it partitions delay, but flows share
    bandwidth across the divide as if they are all the same type of TCP.<br>
    So, as a fortunate side-effect, DualQ also solves the problem of
    scaling TCP throughput long term. {Note 1}<br>
    <br>
    We are proposing that senders will identify packets for this new L4S
    queue with the ECT(1) codepoint. &lt;<a
      href="https://tools.ietf.org/html/draft-briscoe-tsvwg-ecn-l4s-id">draft-briscoe-tsvwg-ecn-l4s-id</a>&gt;<br>
    We call the service offered by this new queue 'L4S' for 'Low Delay,
    Low Loss, Scalable throughput' <br>
    DCTCP works OK as it is, but it will need some safety features.
    There was a lot of energy in an ad hoc session in Prague back last
    July, which produced a prioritised list, including performance
    improvements (see <a
href="https://mailarchive.ietf.org/arch/msg/tcpprague/mwWncQg3egPd15FItYWiEvRDrvA">TCP
      Prague Requirements</a>) but then everyonr went home, went on
    summer holidays, returned to their day jobs and it all went quiet...<br>
    <br>
    If you missed all the above, we've pulled together videos of demos,
    short papers, I-Ds etc here: <a
      href="https://riteproject.eu/dctth/"><a class="moz-txt-link-freetext" href="https://riteproject.eu/dctth/">https://riteproject.eu/dctth/</a></a><br>
    Incuding this particularly useful 2-pager: “<a
href="http://www.internetsociety.org/publications/ietf-journal-november-2015/ultra-low-delay-for-all">Ultra-Low
      Delay for All</a>” IETF Journal, Nov 2015.<br>
    <br>
    Cheers<br>
    <br>
    <br>
    Bob Briscoe &amp; Koen De Schepper<br>
    <br>
    {Note 1} As the window scales, the number of congestion signals per
    RTT remains the same, whereas with classic TCPs it gets smaller.<br>
    <pre class="moz-signature" cols="72">-- 
________________________________________________________________
Bob Briscoe                               <a class="moz-txt-link-freetext" href="http://bobbriscoe.net/">http://bobbriscoe.net/</a></pre>
  </body>
</html>

--------------090006030305010904050805--


From nobody Fri Feb 19 06:28:49 2016
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From: Raffaello Secchi <r.secchi@gmail.com>
Date: Fri, 19 Feb 2016 14:28:24 +0000
Message-ID: <CAKUix-4GiQzQ8NjMdtsOG12C5CO4K-+vpAOtNsPGBkgUk8T8Kg@mail.gmail.com>
To: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>,  Gorry Fairhurst <gorry@erg.abdn.ac.uk>
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Cc: "tcpm@ietf.org" <tcpm@ietf.org>
Subject: [tcpm]  RFC7661, more recent Linux patch available ?
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Hi Ingemar,

Yes, the patch that you found is the most updated.

At the moment there are no plans to put this in the Linux kernel.

Raffaello


From nobody Fri Feb 19 10:24:10 2016
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From: John Leslie <john@jlc.net>
To: Bob Briscoe <ietf@bobbriscoe.net>
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Subject: Re: [tcpm] [tsvwg] (Bar) BoF @IETF-95 'Ultra-Low Queuing Delay for All' (L4S, DualQ Coupled AQM, TCP Prague)?
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Bob Briscoe <ietf@bobbriscoe.net> wrote:
> 
> I'm cross-posting 'cos this impacts 3 IETF WGs and interested implementers.
> 
> We would like to propose a Bar BoF at the Buenos Aires IETF, about L4S, 
> DualQ and solutions to the TCP Prague Requirements.

   This feels like it belongs as a non-WG-forming formal BoF.

   It describes work spanning at least three WGs; and could benefit from
formal scheduling to avoid conflicts with those WGs and others.

   OTOH, it really isn't to the point where a WG charter can reasonably
be drafted. First we must decide whether the work _can_ be split among
existing WGs.

   However this may turn out, I wish to participate remotely.

--
John Leslie <john@jlc.net>


From nobody Mon Feb 22 00:54:20 2016
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To: John Leslie <john@jlc.net>
References: <56C71869.9080503@bobbriscoe.net> <20160219182359.GA74531@verdi>
From: Bob Briscoe <ietf@bobbriscoe.net>
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Subject: Re: [tcpm] [tcpPrague] [tsvwg] (Bar) BoF @IETF-95 'Ultra-Low Queuing Delay for All' (L4S, DualQ Coupled AQM, TCP Prague)?
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John,

On 19/02/16 18:23, John Leslie wrote:
> Bob Briscoe <ietf@bobbriscoe.net> wrote:
>> I'm cross-posting 'cos this impacts 3 IETF WGs and interested implementers.
>>
>> We would like to propose a Bar BoF at the Buenos Aires IETF, about L4S,
>> DualQ and solutions to the TCP Prague Requirements.
>     This feels like it belongs as a non-WG-forming formal BoF.
>
>     It describes work spanning at least three WGs; and could benefit from
> formal scheduling to avoid conflicts with those WGs and others.
>
>     OTOH, it really isn't to the point where a WG charter can reasonably
> be drafted. First we must decide whether the work _can_ be split among
> existing WGs.
>
>     However this may turn out, I wish to participate remotely.
OK, we'll see if the secretariat can help us with that.
Unfortunately we ran out of time for the formal BoF deadline on Friday.


Bob

>
> --
> John Leslie <john@jlc.net>
>
> _______________________________________________
> tcpPrague mailing list
> tcpPrague@ietf.org
> https://www.ietf.org/mailman/listinfo/tcpprague

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/


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Date: Mon, 22 Feb 2016 11:21:24 -0600
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From: Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>
To: Bob Briscoe <ietf@bobbriscoe.net>
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Subject: Re: [tcpm] [tcpPrague] [tsvwg] (Bar) BoF @IETF-95 'Ultra-Low Queuing Delay for All' (L4S, DualQ Coupled AQM, TCP Prague)?
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--001a114e7e78f0aa6b052c5f0fd5
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Just to try to be helpful ...

On Mon, Feb 22, 2016 at 2:54 AM, Bob Briscoe <ietf@bobbriscoe.net> wrote:

> John,
>
> On 19/02/16 18:23, John Leslie wrote:
>
>> Bob Briscoe <ietf@bobbriscoe.net> wrote:
>>
>>> I'm cross-posting 'cos this impacts 3 IETF WGs and interested
>>> implementers.
>>>
>>> We would like to propose a Bar BoF at the Buenos Aires IETF, about L4S,
>>> DualQ and solutions to the TCP Prague Requirements.
>>>
>>     This feels like it belongs as a non-WG-forming formal BoF.
>>
>>     It describes work spanning at least three WGs; and could benefit from
>> formal scheduling to avoid conflicts with those WGs and others.
>>
>>     OTOH, it really isn't to the point where a WG charter can reasonably
>> be drafted. First we must decide whether the work _can_ be split among
>> existing WGs.
>>
>>     However this may turn out, I wish to participate remotely.
>>
> OK, we'll see if the secretariat can help us with that.
>

I believe that happens at http://www.ietf.org/meeting/amreq.html. If you
put "TSV" in as "type of meeting", your happy TSV ADs would see the request.

Thanks,

Spencer


> Unfortunately we ran out of time for the formal BoF deadline on Friday.
>
>
> Bob
>
>
>> --
>> John Leslie <john@jlc.net>
>>
>> _______________________________________________
>> tcpPrague mailing list
>> tcpPrague@ietf.org
>> https://www.ietf.org/mailman/listinfo/tcpprague
>>
>
> --
> ________________________________________________________________
> Bob Briscoe                               http://bobbriscoe.net/
>
>

--001a114e7e78f0aa6b052c5f0fd5
Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Just to try to be helpful ...<div class=3D"gmail_extra"><b=
r><div class=3D"gmail_quote">On Mon, Feb 22, 2016 at 2:54 AM, Bob Briscoe <=
span dir=3D"ltr">&lt;<a href=3D"mailto:ietf@bobbriscoe.net" target=3D"_blan=
k">ietf@bobbriscoe.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-=
color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">John,<span=
 class=3D""><br>
<br>
On 19/02/16 18:23, John Leslie wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
Bob Briscoe &lt;<a href=3D"mailto:ietf@bobbriscoe.net" target=3D"_blank">ie=
tf@bobbriscoe.net</a>&gt; wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
I&#39;m cross-posting &#39;cos this impacts 3 IETF WGs and interested imple=
menters.<br>
<br>
We would like to propose a Bar BoF at the Buenos Aires IETF, about L4S,<br>
DualQ and solutions to the TCP Prague Requirements.<br>
</blockquote>
=C2=A0 =C2=A0 This feels like it belongs as a non-WG-forming formal BoF.<br=
>
<br>
=C2=A0 =C2=A0 It describes work spanning at least three WGs; and could bene=
fit from<br>
formal scheduling to avoid conflicts with those WGs and others.<br>
<br>
=C2=A0 =C2=A0 OTOH, it really isn&#39;t to the point where a WG charter can=
 reasonably<br>
be drafted. First we must decide whether the work _can_ be split among<br>
existing WGs.<br>
<br>
=C2=A0 =C2=A0 However this may turn out, I wish to participate remotely.<br=
>
</blockquote></span>
OK, we&#39;ll see if the secretariat can help us with that.<br></blockquote=
><div><br></div><div>I believe that happens at=C2=A0<a href=3D"http://www.i=
etf.org/meeting/amreq.html">http://www.ietf.org/meeting/amreq.html</a>. If =
you put &quot;TSV&quot; in as &quot;type of meeting&quot;, your happy TSV A=
Ds would see the request.</div><div><br></div><div>Thanks,</div><div><br></=
div><div>Spencer</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb=
(204,204,204);border-left-style:solid;padding-left:1ex">
Unfortunately we ran out of time for the formal BoF deadline on Friday.<spa=
n class=3D""><font color=3D"#888888"><br>
<br>
<br>
Bob<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex">
<br>
--<br>
John Leslie &lt;<a href=3D"mailto:john@jlc.net" target=3D"_blank">john@jlc.=
net</a>&gt;<br>
<br>
_______________________________________________<br>
tcpPrague mailing list<br>
<a href=3D"mailto:tcpPrague@ietf.org" target=3D"_blank">tcpPrague@ietf.org<=
/a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/tcpprague" rel=3D"noreferr=
er" target=3D"_blank">https://www.ietf.org/mailman/listinfo/tcpprague</a><b=
r>
</blockquote></font></span><div class=3D""><div class=3D"h5">
<br>
-- <br>
________________________________________________________________<br>
Bob Briscoe=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"http://bobbrisco=
e.net/" rel=3D"noreferrer" target=3D"_blank">http://bobbriscoe.net/</a><br>
<br>
</div></div></blockquote></div><br></div></div>

--001a114e7e78f0aa6b052c5f0fd5--


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From nobody Mon Feb 29 05:57:56 2016
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the TCP Maintenance and Minor Extensions of the IETF.

        Title           : Retransmission Timeout Considerations
        Author          : Mark Allman
	Filename        : draft-ietf-tcpm-rto-consider-01.txt
	Pages           : 7
	Date            : 2016-02-29

Abstract:
    Each implementation of a retransmission timeout mechanism must
    balance correctness and timeliness and therefore no implementation
    suits all situations.  This document provides high-level guidance
    for retransmission timeout schemes appropriate for general use in
    the Internet.  Within the guidelines, implementations have latitude
    to define particulars that best address each situation.

Terminology

The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-rto-consider/

There's also a htmlized version available at:
https://tools.ietf.org/html/draft-ietf-tcpm-rto-consider-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-tcpm-rto-consider-01


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

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ftp://ftp.ietf.org/internet-drafts/


From nobody Mon Feb 29 06:00:59 2016
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> To me, the sentence on page 5 "In such a case a congestion control
> action is not required." does not really cover an undo of
> congestion control actions once a non-congestion event is
> detected. But this may really be nitpicking...

I just submitted a new version (-01) that includes a tweaked version
of the text referenced above.

I have received no other comments and so this is the only change
between -00 and -01.  Please advise on next steps.

allman




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