Re: [tcpm] Is this a problem?

[Lloyd Wood <[e-mail]>]

At Tuesday 20/11/2007 20:11 -0500, Ethan Blanton wrote:

>Chandrashekhar Appanna spake unto us the following wisdom:
>> On Tue, Nov 20, 2007 at 04:01:21PM -0800, Joe Touch wrote:
>> > Lloyd Wood wrote:
>> > > The community standardised TCP window size advertisements. That's a
>> > > local resource control issue, surely?
>> > 
>> > That's something you have to tell the other end, i.e., it requires a
>> > change to the protocol on the wire. This one can be implemented without
>> > any change to the protocol at all - entirely at the app layer.
>> 
>> And I think the authors are positioning that there is a better place
>> in the architecture to solve this and that is in tcp. I think it is
>> boiling down to just a matter of opinions so far.. esp when you keep
>> repeating that it could be solved in the app layer (for as long as I
>> recall!!)
>
>Joe keeps making this point because it is _very important_.  Any
>feature which can be accomplished at Layer N can be accomplished at
>Layer N - 1, and vice-versa.  

One obvious exception: end-to-end reliabililty.

Another: error-coding for the channel.

L.


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