[e2e] queuing/dropping algorithms *actually* deployed

David P. Reed dpreed at reed.com
Thu Jun 22 01:09:58 PDT 2006

What is the scope?   Are you interested in the queueing/dropping 
protocols deployed on gateways connected via carrier pigeons according 
to the RFC standard?

If so, I am prepared to send samples of the droppings, at least, from 
Trafalgar Sq.

mbgreen at dsl.cis.upenn.edu wrote:
> A colleague who wanted to do some formal model checking and formal
> performance analysis on an application-level protocol going through a
> router, asked me what algorithms are used in currently deployed
> routers in the Internet.  (Looking for an accurate model of packet
> drops when this protocol was running alongside many flows of the same
> protocol, as well as both congestion aware *and* inelastic
> bad-behaving flows).
> I realized that I had no idea what to tell him.  In what
> fraction of routers is RED turned on and used these days?  Is some
> sort of fairness or QoS preserved in a measurable fraction of routers?
> Scheduling?  10 or 15 years ago I guess I could have safely said
> queues are almost all FIFO and drop-tail controls when packets are
> dropped and basically nothing else is relevant in a formal model.
> Today I have no idea.  Is there some web site somewhere that can give 
> me this information?  Is e2e the right place to ask this question ---
> if not, then where? [and, in that case, my apologies for sending it
> here]
> Thanks in advance for any pointers.

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