On Aug 22, 2005, at 11:32 AM, Eric A. Hall wrote:
On 8/22/2005 11:14 AM, David Hagel wrote:
This is interesting. This may sound like a naive question. But if
queuing delays are so insignificant in comparison to other fixed
delay
components then what does it say about the usefulness of all the
extensive techniques for queue management and congestion control
(including TCP congestion control, RED and so forth) in the
context of
today's backbone networks?
Latency is cumulative. Knocking a little time off Part A will still
act to
shorten total time, regardless of the time occupied by Part B
Queuing behaviors are also significant when you are suffering
congestion,
apart from the delay factors
I think the key here is "when you are suffering congestion".
RS said that queueing delay is irrelevant when the link was between
60% and > 97% full, depending on the speed of the link. If you have
a link which is more full than that, queueing techniques matter.
Put another way, queueing techniques are irrelevant when the queue
size is almost always <= 1.
--
TTFN,
patrick
