On Sun, 14 Mar 2010, Tony Li wrote:
Actually, no growth in prefixes does not imply that there is no growth in
the Internet. You can still add customers within existing prefix
allocations and improve your addressing efficiency.
Hehe, My implicit assumption is that there's no significant change in
allocation densities. :) Stuff like that generally seems to be an
administive issue, so it's maybe unlikely it can be affected through
routing changes.
First, no one is claiming that there is an imminent and urgent
problem. What I feel that we've shown is that we have a long term
systemic problem. Given that truly dealing with this issue does
appear to require major amounts of time to deploy, it only seems
reasonable to start dealing with it long before it becomes an
urgent problem.
Please see my RAWS presentation. It shows that prefix growth
exceeds the speedup that we can expect in DRAM.
I remember reading that.
This in turn implies that BGP will take longer to converge at a
given node when that node has to process the full table.
That's the thing though, the most recent data doesn't seem to show
any evidence of things like that. If per-node convergence was taking
significantly longer (in the "scaling badly relative to prefix
growth" sense), then Sigma(per-prefix per-node convergence) should be
similarly increasing by at least the same amount and BGP observers
ought to be able to see that, and so the data should show it.
Yet it doesn't seem to, right?
Further, even if the growth issues only affected a certain subset of
prefixes, surely there'd be "side-band" issues. I.e. processing
problems with certain prefixes should adversely affect the processing
of other prefixes being processed around the same time.
I'm sorry for being such an arse with my scepticism, and I'll
understand if people reply to me as if I'm half-wit, but if scaling
is a problem surely it should be apparent in some data somewhere over
the last decade+ that people have been worrying about it? Where's the
smoking gun graph, based on real data, that shows the scaling
problem? I'm somewhat willing to take your word as authoritative, but
ideally we'd have graphs :).
I stress again that, despite taking this contrarian view of the
scaling problem, I still think the work here is very important!
I just think this question must have a big impact on which classes of
solutions are and are not viable.
regards,
--
Paul Jakma p...@jakma.org Key ID: 64A2FF6A
Fortune:
We don't understand the software, and sometimes we don't understand the
hardware, but we can *___see* the blinking lights!
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