[e2e] What should e2e protocols know about lower layers?

[Panos GEVROS]

RJ Atkinson typed :

 |As I also read the TSVWG list, I'll note that I think that congestion
 |avoidance and control mechanisms should always be turned on.
 |I disagree with folk disabling congestion avoidance and control
just because a given link might be perceived to be "local"
 |(particularly where "local" seems to have the de facto meaning
 |of "on-subnet").



although disabling congestion avoidance and control is hard to justify and 
probably not a wise thing to do in any case, the ability of the transport  to 
*relax* (make more aggressive) the congestion control rules ( or negotiate 
what is the appropriate congestion control behaviour based on information the 
endpoints have e.g. policy or some defintion of "locality") may enhance 
performance, increase utilisation,  benefit the application and the network 
provider in general

so  overriding congestion control was probably too radical a measure to deal 
with locality , imho adopting a more aggressive behaviour (but still 
controlled) may be justified

the counter-argument is that diversity in the congestion control behaviours 
may well create a mess which will shadow the performance/other benefits . but 
this remains to be seen.

cheers
Panos