Re: [nwcrg] TR: New Version Notification for draft-irtf-nwcrg-coding-and-congestion-01.txt

"lloyd.wood@yahoo.co.uk" <lloyd.wood@yahoo.co.uk> Sat, 08 February 2020 21:24 UTC

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Date: Sat, 8 Feb 2020 21:24:23 +0000 (UTC)
From: "lloyd.wood@yahoo.co.uk" <lloyd.wood@yahoo.co.uk>
To: lloyd.wood=40yahoo.co.uk@dmarc.ietf.org, Michael Welzl <michawe@ifi.uio.no>
Cc: Kuhn Nicolas <nicolas.kuhn@cnes.fr>, Nwcrg <nwcrg@irtf.org>
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Subject: Re: [nwcrg] TR: New Version Notification for draft-irtf-nwcrg-coding-and-congestion-01.txt
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Thanks, Michael.


that makes more sense -- the term, to me, invoked a router 
bug overwriting the tail of a packet in memory, but the 
packet is still delivered (because header checksums 
are a fixup, and a whole recomputation across the packet 
is not done) - in other words, the transport area 
that UDP Lite works in for end-corrupted (tail loss) 
packets, and was developed to address. 


Packet tail rather than session tail. 
And that really didn't fit with the context...


'session tail loss' or 'transfer tail loss' 
may be clearer.



Lloyd Wood lloyd.wood@yahoo.co.uk http://about.me/lloydwood






On Sunday, 9 February 2020, 00:53:49 GMT+11, Michael Welzl <michawe@ifi.uio.no> wrote: 





Thanks!  We’ll explain in the next version.
“Tail loss” has become a common term in transport - because it’s a common problem: e.g. web transfers are usually short, and it’s not uncommon to lose just the last few packets of them (hence “tail”) - but then, for these packets, the sender never gets a DupACK, and all that helps is a timeout, creating significant delay.

Cheers,
Michael


> On Feb 8, 2020, at 1:24 AM, lloyd.wood=40yahoo.co.uk@dmarc.ietf.org wrote:
> 
>  What is a "tail loss"? The trem is used repeatedly...
> 
> thanks
> 
> 
> Lloyd Wood
> lloyd.wood@yahoo.co.uk
> 
> On Friday, February 7, 2020, 6:52 pm, Kuhn Nicolas <Nicolas.Kuhn@cnes.fr> wrote:
>> Hello everyone, 
>> 
>> Following the fruitfull discussions we had at last IETF, we have been working on an updated version of the document. 
>> We have clarified the interactions between the transport congestion control and the FEC mechanism and clarified the scope of the document. 
>> 
>> We expect to further work on the document before the cut-off (and at least include a discussion on the receiver). 
>> In the meantime, please let us know if you have any views on this document.
>> 
>> Thanks, 
>> 
>> Nico
>> 
>> -----Message d'origine-----
>> De : internet-drafts@ietf.org <internet-drafts@ietf.org> 
>> Envoyé : vendredi 7 février 2020 08:12
>> À : Michael Welzl <michawe@ifi.uio.no>no>; Francois Michel <francois.michel@uclouvain.be>be>; Kuhn Nicolas <Nicolas.Kuhn@cnes.fr>fr>; Emmanuel Lochin <emmanuel.lochin@isae-supaero.fr>
>> Objet : New Version Notification for draft-irtf-nwcrg-coding-and-congestion-01.txt
>> 
>> 
>> A new version of I-D, draft-irtf-nwcrg-coding-and-congestion-01.txt
>> has been successfully submitted by Nicolas Kuhn and posted to the IETF repository.
>> 
>> Name:        draft-irtf-nwcrg-coding-and-congestion
>> Revision:    01
>> Title:        Coding and congestion control in transport
>> Document date:    2020-02-06
>> Group:        nwcrg
>> Pages:        9
>> URL:            https://www.ietf.org/internet-drafts/draft-irtf-nwcrg-coding-and-congestion-01.txt
>> Status:        https://datatracker.ietf.org/doc/draft-irtf-nwcrg-coding-and-congestion/
>> Htmlized:      https://tools.ietf.org/html/draft-irtf-nwcrg-coding-and-congestion-01
>> Htmlized:      https://datatracker.ietf.org/doc/html/draft-irtf-nwcrg-coding-and-congestion
>> Diff:          https://www.ietf.org/rfcdiff?url2=draft-irtf-nwcrg-coding-and-congestion-01
>> 
>> Abstract:
>>   Coding is a reliability mechanism that is distinct and separated from
>>   the loss detection of congestion controls.  Using coding can be a
>>   useful way to better deal with tail losses or with networks with non-
>>   congestion losses.  However, coding mechanisms should not hide
>>   congestion signals.  This memo offers a discussion of how coding and
>>   congestion control can coexist.  This document can help the
>>   comparison of FEC schemes by identifying at which level they are
>>   operating with respect to the transport congestion control.
>> 
>>   This document is the product of the Coding for Efficient Network
>>   Communications Research Group (NWCRG).  The scope of the document is
>>   end-to-end communications: coding for tunnels is out-of-the scope of
>>   the document.
>> 
>>                                                                                   
>> 
>> 
>> 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.
>> 
>> The IETF Secretariat
>> 
>> _______________________________________________
>> nwcrg mailing list
>> nwcrg@irtf.org
>> https://www.irtf.org/mailman/listinfo/nwcrg
>>> 
> 
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