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Hello all,

      I've updated/cleaned up the TCP Eifel code that I've had sitting arou=
nd,
and was wondering if I could get some feedback and more testing before I co=
mmit.

What it is/what it does:
 * Eifel detection/response algorithms. (RFC3522/RFC4015)
 * Used the TCP timestamp option to detect reordering.
 * Restores congestion state in case of reordering induced window shrink.

Who will benefit:
 * GPRS users, or others on quirky networks (Modem mayby).
  (http://www.cs.helsinki.fi/u/gurtov/papers/ew02.html cites 12% performance
   benefit, though that's in simulation.)

How to use it:
 * Apply the patch, recompile, reboot.
 * The net.inet.tcp.do_eifel sysctl will control it.

Diff:
http://www.sigusr1.org/~kurahone/misc-hacks/tcp-eifel-netbsd-3.99.5.diff.gz

--=20
Kentaro A. Kurahone
SIGUSR1 Research and Development

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