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[ih] why did CC happen at all?

Am 01.09.2014 um 18:34 schrieb Louis Mamakos:
> On Sep 1, 2014, at 12:12 PM, Detlef Bosau <detlef.bosau at web.de> wrote:
>> We have pretty the same problem in ARQ protocols in wireless networks
>> and in TCP as well, so if you eventually would like to pursue a PhD in CS:
>> This problem a) can be solved and b) solutions are implemented and
>> available to the market ;-)
> So actually, you don't.  Perhaps from a theoretical perspective you
> believe this to be the case, but the real operational, engineering and
> business realities are different.

I did not write, that all implementations are correct. I wrote that the
problem is solved.
> Some given wireless network is tightly controlled and engineered by
> some single entity.  When you talk about congestion and flow control
> over the internet, many/most of those flows transit more than one
> operator's network.  And the scaling problems are different, and
> the revenue models are very different.
Nasty analogy: Windows exist. So do you think, that writing operating
systems is still an unsolved problem?

> You might well ask why we don't have end-to-end QoS treatment for
> traffic over the Internet.  It is very much more a business problem
> than it is turning the knobs on the routers to honor diffserv markings.

I can write my own assessment here: The success story of TCP/IP is the
story of best effort networks.

There are dozens of QoS approaches and architectures. And it doesn't
matter (for the reasons above) that there are networks which don't
support QoS.

Actually, best effort networks became widely accepted.

Hence, any approach for congestion control and flow control must provide
for best effort services.

As you mention INTSERV: To the best of my knowlege, INTSERV was, at
least, not generally deployed in the whole Internet ;-)


Detlef Bosau
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