[e2e] Why do we need TCP flow control (rwnd)?
detlef.bosau at web.de
Tue Jul 1 11:26:45 PDT 2008
Lachlan Andrew wrote:
> That raises the question: should we model access links or edge links,
> or have separate models of each?
We should read the chapter "introduction" which can be found in an
arbitratry textbook on stochastic processes :-)
Tyically, there are two statements.
1.: Markov processes and Poisson processes are nice, because they are
easy do deal with.
2.: Nature and reality are naughty, because both are neither markovian
However, that's not only a problem for networkers :-)
BTW: That's one of the reasons for my strong doubts against PF scheduling.
It is the "canonical set of assumptions:"
CSOA: "Anything is i.i.d, markovian, possonian, gaussian distributed and
stationary. Proof: We cannot deal with anything else."
From that, we have the main goal of CSOA: If reality is not compliant
to theory, drop reality, start a redesign :-)
(BTW: This is a well proven principle. The German government resolves
our unemployment problem that way - for decades now.)
Detlef Bosau Mail: detlef.bosau at web.de
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