[e2e] tcp in high rate network

[Jonathan M. Smith]

In the absence of errors and congestion TCP can run as fast as IP (minus
some processing overhead) if properly tuned and presuming the end-point
device has the horesepower to drive it. In practice, these latter two 
are coupled (e.g., choice of buffer size vs. host I/O capacity vs. DRAM
speeds vs. slow-start vs. RTT ....). For an architectural prespective,
see:


%T An Analysis of TCP Processing Overhead
%A David D. Clark
%A Van Jacobson
%A John Romkey
%A Howard Salwen
%J IEEE Communications Magazine
%V 27
%N 6
%D June 1989
%P 23-29

For an experimental perspective, we filled most of an OC-3c between Philadelphia
and Morristown NJ with TCP/IP/ATM/SONET in 1994 - the limitations were in the
hosts, not the protocol. In later experiments in 1995, with different hosts,
we were able to sustain 215+ Mbps, TCP/IP/ATM/SONET, albeit not over the WAN.
The limit in this case was again the host, in particular a bus in the data
transfer path. 

In summary, TCP seems to be able to run as fast as links as long as the factors
pointed out above are addressed.

								-JMS

> Does anyone know whether TCP can run efficiently on high rate links such as Tb ethernet.if the rate of access network is high too , what will happen,I am afraid that the efficiency will reduced due to the special congestion control of TCP.
> 
> 
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