[e2e] link between Kelly's control and TCP's AIMD

[Saverio Mascolo]

well this is not a technical answer!  If you build a system made of linear
subsystems (i.e. gains, delays and integrators) how can you get a nonlinear
system?

Saverio

> Well, only 15 years of modest network consulting for over 1000 modest
> companies from GM on down.  :]
>
> Have VJ estimate how much delay is incurred by any current TCP under 1%
random
> packet loss; then 0.1%.  Or, have him or anyone else, itemize the
differences
> among TCPs deployed by, say, the top 10 systems vendors.
>
> There've been many archived discussions of how TCP does & doesn't work as
well
> as it should, given all the years that have passed, in which continued
> protocol development could have, but did not, occur.  Thus the Internet --
a
> study in insecurity, capacity co-option, performance mediocrity,
engineering
> bureaucracy...  But, that's not what folks want to hear.  Which is why the
> mediocrity continues and those of us in consulting & security have good
jobs &
> good profits.  :]
>
> Alex
>
> Saverio Mascolo wrote:
> >
> > why do you think TCP congestion control is  not linear? I tend to agree
with
> > Van Jacobson when syas that a network is to a large extend  a linear
system
> > made of integrators, delays and gains.
> >
> > Saverio
> >
> > ----- Original Message -----
> > From: "Cannara" <cannara at attglobal.net>
> > To: <end2end-interest at postel.org>
> > Sent: Friday, February 18, 2005 6:12 AM
> > Subject: Re: [e2e] link between Kelly's control and TCP's AIMD
> >
> > > And, without understanding/modelling TCP's nonlinear behaviors, it
will
> > only
> > > serve for gross predictions.
> > >
> > > Alex
> > >
> > > Ted Faber wrote:
> > > >
> > > > On Thu, Feb 17, 2005 at 01:31:08AM +0000, Damon Wischik wrote:
> > > > >
> > > > > Roy Xu wrote:
> > > > > >I'm looking for a pointer to literatures that link the
> > > > > >TCP's (discrete) AIMD to Kelly's (continuous) control
formulation.
> > > > >
> > > > > Kelly's continuous-time formulation uses a differential equation
model
> > > > > (also called a fluid model) for TCP. You should look at the
literature
> > > > > which describes this fluid model, starting with
> > > > >
> > > > > "A Fluid-based Analysis of a Network of AQM Routers Supporting TCP
> > Flows
> > > > > with an Application to RED", V. Misra, W. Gong, D. Towsley,
SIGCOMM
> > 2000.
> > > >
> > > > Fluid flow congestion control analysis goes beck to these guys at
least:
> > > >
> > > > %A D. Mitra
> > > > %A T. Seery
> > > > %T Dynamic Adaptive Windows for High Speed Data Networks: Theory and
> > > > %Simulation
> > > > %J Proc. SIGCOMM Symposium on Communications Architectures and
Protocols
> > > > %P 30-29
> > > > %I ACM SIGCOMM
> > > > %C Philadelphia, PA
> > > > %D Sept 24-27, 1990
> > > >
>