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Re: [manet] undirectional or bidirectional (Was Re: I-D Action: draft-ietf-manet-dlep-da-credit-extension-00.txt)

Henning Rogge <hrogge@gmail.com> Wed, 15 February 2017 07:05 UTC

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From: Henning Rogge <hrogge@gmail.com>
Date: Wed, 15 Feb 2017 08:04:33 +0100
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To: "James A. (Jim) Stevens" <james.a.stevens@rockwellcollins.com>
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Subject: Re: [manet] undirectional or bidirectional (Was Re: I-D Action: draft-ietf-manet-dlep-da-credit-extension-00.txt)
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On Wed, Feb 15, 2017 at 12:28 AM, James A. (Jim) Stevens
<james.a.stevens@rockwellcollins.com> wrote:
> Henning, I think I understand and agree with everything you wrote, but not
> absolutely sure, so want to double check.

*sigh* you are right, I should have been more specific.

Flow control of "user data moving from router to radio" is most
important to move the bottleneck from the interface specific radio to
the generic router.

Henning

> In your second paragraph, when you say that '"flow control from the router
> towards the radio is THE most important part, it is practically necessary
> for all radios if you want to do some kind of Priorization on the router
> "
>
> I can read the phrase "flow control from the router towards the radio" two
> ways.
>
> I think you mean meaning #1 below, correct?
>
> (1) radio sends unidirectional credit flow to router to perform "flow
> control from router towards radio"
>
> or
>
> (2) router sends unidirectional credit flow to radio to perform "flow
> control from router towards radio"
>
> Similarly for confusion in third paragraph on "flow control from the radio
> to the router".
>
> I agree if you meant meaning #1 above and disagree if  you meant meaning #2
> above.
>
> I strongly agree with your first and fourth paragraphs.
>
> Thanks,
> Jim Stevens
>
> ==  Tue, 14 Feb 2017 08:31:02 +0100 email from Henning Rogge
> ==
> ==
> == Hi,
> ==
> == in general flow control is about keeping the "bottleneck/queue" mostly
> == on the router, where we can control it at a central point. That is an
> == important part of the design goal of DLEP.
> ==
> == I think flow control from the router towards the radio is THE most
> == important part, it is practically necessary for all radios if you want
> == to do some kind of Priorization on the router.
> ==
> == Flow control from the radio to the router is a (in my opinion) rare
> == cornercase for radios with a TDMA that can control incoming traffic.
> ==
> == Because of this I think an unidirectional flow control extension is a
> == good idea, otherwise we add a lot of complexity which will nearly
> == never be used.
> ==
> == Henning Rogge
> ==
>
>
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