[e2e] Persistent congestion with few TCP-compatible sources?
Reiner Ludwig
Reiner.Ludwig at ericsson.com
Mon May 1 20:45:28 PDT 2006
Hi,
in a contribution that I'm writting for 3GPP, I would like to make the
following statement:
"It is well-known that persistent congestion (large average queue sizes
and high packet drop rates) – which is an essential precondition for the
occurrence of a series of congestion-related back-to-back losses of [IP
packets] – will not occur as long as only a few (e.g., less than 100)
traffic sources share the same queue at the bottleneck link of an
end-to-end path, and as long as those traffic sources have implemented a
TCP-compatible congestion control scheme."
[The full paragraph is copied below]
Can anyone, please, point me to some established papers that would
backup that statement?
///Reiner
--------------
"It is well-known that persistent congestion (large average queue sizes
and high packet drop rates) – which is an essential precondition for the
occurrence of a series of congestion-related back-to-back losses of PDCP
PDUs – will not occur as long as only a few (e.g., less than 100)
traffic sources share the same queue at the bottleneck link of an
end-to-end path, and as long as those traffic sources have implemented a
TCP-compatible congestion control scheme. Note that in response to a
packet loss TCP halves its send rate. In fact, this rate halving
behaviour of TCP is widely acknowledged as the basis for the stability
of the Internet. Note also that this discussion is in principle
independent of the queue management scheme implemented at the bottleneck
link, e.g., whether it is a passive drop-tail queue management scheme,
or an active queue management scheme which is tailored to maintaining
free buffer space for the purpose of absorbing burst arrivals of
packets. It should be noted, however, that active queue management
schemes are known to reduce packet drop rates [RFC 2309], and are widely
deployed in state-of-the-art IP routers."
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