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Re: [RPRWG] More comments on preemption




For those who only concern about current market reality,
please ignore the following. Otherwise, please read on.

During the preemption discussion, the most dominating
factor people use againt preemption is that "under high
speed condition, the worst case delay increase due to
Jumbo frame is ignorable".

However, does anybody concern about JITTER and the
size requirement of the anti-jitter buffer at the receiving
end terminal of the RPR (although the anti-jiiter buffer may
not be required on the RPR node). For those who care, 
let me remind you the fact that the size of the anti-jitter 
buffer will increase along with JITTER, which results in 
further more delay. By looking at the percentage of increase,
I'm not sure whether the word "ignorable" can be easily used
here.

One more point, I'm a cut-through advocate, not just for the
gain on the delay factor, but mainly for the gain on the jitter 
factor. But for those cut-through advocates who are STRONGLY
against preemption, I would ask the question: How can we
justify the sacrifice of the hop-by-hop error checking capability 
in favor of "ignorable" gains on the delay and jitter by supporting 
the cut-through capability?


Best Regards

William Dai