Check out the new USENIX Web site.

USENIX Home . About USENIX . Events . membership . Publications . Students
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


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.

  • View the full text of this paper in PDF.
    Click here if you have forgotten your password Until December 2005, you will need your USENIX membership identification in order to access the full papers. The Proceedings are published as a collective work, © 2004 by the USENIX Association. All Rights Reserved. Rights to individual papers remain with the author or the author's employer. Permission is granted for the noncommercial reproduction of the complete work for educational or research purposes. USENIX acknowledges all trademarks within this paper.

  • If you need the latest Adobe Acrobat Reader, you can download it from Adobe's site.
To become a USENIX Member, please see our Membership Information.


?Need help? Use our Contacts page.

Last changed: 13 Oct. 2004 aw
Technical Program
OSDI '04 Home