Re: [Diffserv] Modeling of Policing component.

Tom Scott wrote:
> 
> "sqreeek" (that's the sound of the opening of a can of worms): Would
> you consider evolving the informal model of RFC 3290 into a more
> formal calculus, 

No. Never. That is an academic topic (no insult intended), not
something that the IETF should do. 

   Brian

where such issues as Meter -> AbsoluteDropper and
> AlgorithmicDropper -> Scheduler might be derived from first
> principles? FSMs are already used in RFCs, so maybe it wouldn't be
> such a jump to ASMs? You've already established four categories of
> basic functions and indicated a rule for constructing arbitrarily
> complex TCBs from the elements. Why drop the analysis at that point?
> 
> -- TT
> 
> -------- Original Message --------
> Subject: RE: [Diffserv] Modeling of Policing component.
> Date: Mon, 1 Jul 2002 09:28:29 -0700
> From: "Andrew Smith" <ah_smith@acm.org>
> To: "'ravikumarb'" <ravikumarb@infosys.com>
> CC: <diffserv@ietf.org>
> 
> I disagree: if you follow an Algorithmic Dropper by a Scheduler (there's
> an implied Queue in there somewhere), when the Queue starts to get full
> due to "excess" traffic (arrival - departure > 0 over appropriate time
> intervals), the Dropper will kick in. That is "policing" (it's doing
> shaping at the same time of course).
> 
> Meter->AbsoluteDropper is the more conventional way to think about
> policing, I agree, but AlgorithmicDropper->Scheduler is also valid.
> 
> Andrew Smith
> 
> -----Original Message-----
> From: diffserv-admin@ietf.org [mailto:diffserv-admin@ietf.org] On Behalf
> Of ravikumarb
> Sent: Monday, July 01, 2002 6:49 AM
> To: Brian E Carpenter
> Cc: diffserv@ietf.org
> Subject: RE: [Diffserv] Modeling of Policing component.
> ...
> We can have an Algorithmic Dropper as part of Policer, but not a
> Scheduler. The moment we have a Scheduler, what we are doing is Shaping
> not policing.
> 
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-- 
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Brian E Carpenter 
Distinguished Engineer, Internet Standards & Technology, IBM 
On assignment at the IBM Zurich Laboratory, Switzerland

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