[Iccrg] Proposal for ICCRG operations

[Tim Shepard]

> On Sat, 2006-02-04 at 15:56 -0500, John Leslie wrote:
> > Tim Shepard <shep at alum.mit.edu> wrote:
> > > To: "S. Keshav" <keshav at uwaterloo.ca>
> > > 
> > >> What's wrong with TCP's congestion control scheme
> > > 
> > > The problem with TCP's congestion control scheme is that it builds a
> > > standing queue at the point of congestion, which increases the delay.
> > 
> >    I'd go farther than than: the fundamental problem with TCP's
> > congestion control scheme is that it never measures congestion.
> > 
> >    That said, I agree with Tim that building a queue (of unknown length)
> > at the point of congestion is not very smart congestion control.
> > 
> > > A better congestion control scheme would control the queue length,
> > > with a target of zero (or very few) packets, thereby minimizing the
> > > impact on delay.
> 
> by targetting a queue level of few packets we  have that each flow gets
> a constant fraction of the buffer space. In a FIFO queue this translates
> in the same fraction of used bandwdith.

Why is that?

I don't think that is necessarily true.  It may be true for some kinds
of control schemes, but it is not necessarily true for all kinds of
control schemes.

			-Tim Shepard
			 shep at alum.mit.edu