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Re: do read !!! Comcast confirms 250GB cap effective October 1
From: David Farber <dave () farber net>
Date: Fri, 29 Aug 2008 17:12:15 -0400



Begin forwarded message:

From: Dan Lynch <dan () lynch com>
Date: August 29, 2008 2:37:05 PM EDT
To: Dave Farber <dave () farber net>, Tony Lauck <tlauck () madriver com>
Subject: Re: [IP] do read !!! Comcast confirms 250GB cap effective October 1

Thanks Tony. Now I think it gets trickier here as a solution for a single AS (like Comcast) may not be very helpful for customers who span multiple Ases, if the intermediate systems do not also play by the same rules. Maybe
someone like Mike O'Dell can offer his deep experience here?  Or Larry
Roberts whose new company, Anagran, is wrestling with this issue of
"fairness" across a long haul.  We do need some "rules of the road" that
benefit everyone or no one will win very much. Right now those countries that are overprovisioning (like Japan, South Korea and Finland) look pretty
smart and don't have to address the fairness issue (yet).

Dan


On 8/29/08 10:13 AM, "Dave Farber" <dave () farber net> wrote:



Begin forwarded message:

From: Tony Lauck <tlauck () madriver com>
Date: August 29, 2008 12:55:28 PM EDT
To: Dan Lynch <dan () lynch com>
Cc: "'David Farber'" <dave () farber net>
Subject: Re: [IP] Re:   do read Comcast confirms 250GB cap effective
October 1

Dan,

Yes, a cap will solve the congestion problem if it is set sufficiently
low.  In the limit it definitely solves the congestion problem by
driving away all the customers. (The Prodigy solution.)

The problem is that congestion is caused by instantaneous load
exceeding capacity, whereas monthly usage measures average load. If
there are, say, four busy hours per day, an average based cap will
need to be set (roughly) six times lower than it would otherwise need
to be. The result will be unhappy customers. In addition, the bean
counters (who are unlikely to know any queuing theory) may suggest
that expenses be cut by reducing resources!

I have written many IP posts on this subject and you can find them in
the archive. Basically, a proper solution is to give higher priority
to users who create less congestion. Let everybody go as fast as they
want when there is no congestion. If people need or want more capacity
than others, let them pay more for more "shares" and adjust the
weighting accordingly, and use the money to increase capacity. This
approach is politically neutral, i.e. it will work in a capitalist or
a socialist society. Unlike the Comcast cap it follows the principle
of maximum utilization of resources.

Tony Lauck
https://www.aglauck.com



Dan Lynch wrote:
Tony, can you teach me how a cap does not solve their congestion
problem?
In the limit it sure does...
Thanks,
Dan





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