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OSDI '04 — Abstract
Pp. 317–332 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
Abstract
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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