[e2e] Question the other way round:

Detlef Bosau detlef.bosau at web.de
Wed Nov 20 14:44:24 PST 2013

Am 20.11.2013 19:23, schrieb Joe Touch:
>> I read the reference to packets as an example.
> Me too.
> But circuits don't have a collapse or oversubscription. They simply
> reject calls that aren't compatible with available capacity.
> I'm not disagreeing with the definition; I'm disagreeing with the
> assumption that having a network implies congestion and thus the need
> for congestion control.

And I'm agreeing with you here. I'm convinced that a proper resource
management could simply spare us the whole (as you rightly say:
reactive) congestion control.

> There are a variety of mechanisms that avoid congestion, typically by
> a-priori reservation (circuits), or by limiting resource use
> implicitly (e.g., ischemic control). These are a kind of proactive
> control that avoid congestion in the first place.
> That's not to say whether these mechanisms are scalable or efficient
> compared to the resource sharing afforded by packet multiplexing.

However, it is worthwhile considering these approaches.

In a sense, VJCC (and derivatives) is a kludge to work around the
missing resource management in TCP in RFC 793.

Resource management does not necessarily mean "resource reservation" or
"admission control"  - but in best effort networks it should
provide for resource sharing / distribution and proper scheduling.

Detlef Bosau
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