Re: [tcpm] [Lwip] WGLC review of draft-ietf-lwig-tcp-constrained-node-networks

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Wed, 05 June 2019 10:36 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: Carles Gomez Montenegro <carlesgo@entel.upc.edu>
CC: "tcpm@ietf.org" <tcpm@ietf.org>, "lwip@ietf.org" <lwip@ietf.org>, "jon.crowcroft@cl.cam.ac.uk" <jon.crowcroft@cl.cam.ac.uk>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: [Lwip] WGLC review of draft-ietf-lwig-tcp-constrained-node-networks
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Date: Wed, 5 Jun 2019 10:36:00 +0000
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Subject: Re: [tcpm] [Lwip] WGLC review of draft-ietf-lwig-tcp-constrained-node-networks
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Hi
And thanks for the update, the added text looks very good

/Ingemar

> -----Original Message-----
> From: Carles Gomez Montenegro <carlesgo@entel.upc.edu>;
> Sent: den 5 juni 2019 11:35
> To: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>;
> Cc: tcpm@ietf.org; lwip@ietf.org; jon.crowcroft@cl.cam.ac.uk
> Subject: Re: [Lwip] WGLC review of draft-ietf-lwig-tcp-constrained-node-
> networks
> 
> Hi Ingemar,
> 
> Thank you very much for reviewing the draft and for your suggestions. Your
> feedback is timely and very welcome.
> 
> Based on your comments, in the last revision of our document (-08) we have
> added a new subsection (subsection 4.3.3) that discusses the Initial
Window
> setting in the context of CNNs.
> 
> Cheers,
> 
> Carles (on behalf of all authors)
> 
> 
> > Hi
> >
> > I hope that I am not too late with the review.
> >
> > Perhaps this has been brought up earlier, and it that is the case then
> > sorry for kicking in open doors.
> >
> >
> >
> > I have read but to not seen any mention of the initial congestion
> > window size. Today the initial window in most TCP stacks is set to
> > 10*MSS and this may well be used by Nb-IoT implementers that are
> > unaware of default settings.
> >
> > While this is likely not an issue if he applications transmit small
> > objects that fit in a few segments, it can become an issue with larger
> > object transfers and if a burst of 14600 bytes overflows a tiny
> > network buffer.
> >
> > Should this be addressed, possibly with a recommendation to adjust the
> > initial window based on network constraints ?
> >
> >
> >
> > /Ingemar
> >
> > ==================================
> >
> > Ingemar Johansson  M.Sc.
> >
> > Master Researcher
> >
> >
> >
> > Ericsson Research
> >
> > Network Protocols & E2E Performance
> >
> > Labratoriegränd 11
> >
> > 971 28, Luleå, Sweden
> >
> > Phone +46-1071 43042
> >
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> >
> > ingemar.s.johansson@ericsson.com
> >
> > www.ericsson.com
> >
> >
> >
> >                 Nothing to stop this
> >
> >              being the best day ever
> >
> >                             U2
> >
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> >
> >
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