[e2e] Re: Bursty traffic and TCP flows (was: TOEs and related issues)
zec at tel.fer.hr
Wed Mar 10 12:40:03 PST 2004
On Wednesday 10 March 2004 19:24, RJ Atkinson wrote:
> On Mar 09, 2004, at 11:50, Marko Zec wrote:
> > All of the
> > IBM's IP routers at that time were built in such a silly way that
> > their buffers were measured / limited in terms of number of
> > packets.
> Ah, so one product has a particular design strategy, therefore
> all products of that type must use that same design strategy. Whew.
> Thanks for enlightening me. I erroneously thought that different
> folks might make different design choices (good, bad, or sideways).
You asked for concrete examples, and I only provided one I was 100% sure
of. What's wrong with that?
> > Furthermore, I guess
> > most of the today's Cisco routers are also suffering from the
> > similar silly (mis)design problem...
> It would be interesting to hear from someone with first-hand
> knowledge of what cisco's design(s) look(s) like today, so we could
> work with data rather than with speculation.
I can only join this appeal. However, it would be even more interesting
to hear why people can't stop talking about "alternative designs" while
avoiding to provide a pointer to a single example (vendor X router
model Y) which _doesn't_ count buffer slots in # of packets?
On the other hand, as a newcomer to this list I find it sad to observe
that only a few people tried to stick with the topic - on how bad can
traffic bursts be hitting router queues built up by standard TCP flows,
which seems much more of an e2e problem to me, than the indepths of the
> > Regarding the other statement that implies on how unusual it must
> > be for
> > a TCP flow to build up a queue on a bottleneck link / router, I'd
> > rather not comment...
> I didn't imply any such thing; I just noted that the chain of
> had gotten pretty long -- without much validation that the
> assumptions were generally true today. An invalid premise is
> generally unlikely to lead to a valid conclusion, so it is helpful to
> know whether or not those premises are likely to be valid.
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