OSDI '04 Abstract
Pp. 317332 of the Proceedings
Deploying Safe User-Level Network Services with icTCP
Haryadi S. Gunawi, Andrea C. Arpaci-Dusseau, and Remzi H. Arpaci-Dusseau, University of Wisconsin, Madison
We present icTCP, an "information and control" TCP implementation
that exposes key pieces of internal TCP state and allows
certain TCP variables to be set in a safe fashion. The primary
benefit of icTCP is that it enables a variety of TCP extensions
to be implemented at user-level while ensuring that extensions
are TCP-friendly. We demonstrate the utility of icTCP through
a collection of case studies. We show that by exposing information
and safe control of the TCP congestion window, we can
readily implement user-level versions of TCP Vegas, TCP Nice,
and the Congestion Manager; we show how user-level libraries
can safely control the duplicate acknowledgment threshold to
make TCP more robust to packet reordering or more appropriate
for wireless LANs; we also show how the retransmission
timeout value can be adjusted dynamically. Finally, we find that
converting a stock TCP implementation into icTCP is relatively
straightforward; our prototype requires approximately 300 lines
of new kernel code.
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