On Mon, 19 Sep 2016, Mike Hammett wrote:
The principal complaint is that upstream of whatever is doing the rate
limiting for a given customer there is significantly more capacity being
utilized than the customer has purchased. This could happen briefly as
TCP adjusts to the capacity limitation, but in some situations this has
persisted for days at a time. I'll list out a few situations as best as
I can recall them. Some of these may even be merges of a couple
situations. The point is to show the general issue and develop a better
process for collecting what exactly is happening at the time and how to
address it.
One situation had approximately 45 megabit/s of capacity being used up
by a customer that had a 1.5 megabit/s plan. All other traffic normally
held itself within the 1.5 megabit/s, but this particular CDN sent
excessively more for extended periods of time.
It sounds like either the rate-limiting just isn't working, or the CDNs
are trying too hard to ramp up the transfer rate in spite of your dropping
some/most of the packets. I assume drops are happening either as part of
the rate-limiting/policing, or simply as a result of trying to stuff
45mbit/s onto a 1.5mbit/s pipe....96.5% packet loss...and they're not
slowing down at the sender?!?
This is kind of a funny problem though, because CDNs get paid to deliver
data, and they get compared/graded according to who can deliver the bits
the fastest...and here you are complaining that they're delivering the
bits too fast (or at least faster than you'd like them to).
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Jon Lewis, MCP :) | I route
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