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Hello All,

Since I was up late anyway, I've implemented preliminary support
for the Eifel Detection/Response algorithms.  The idea is to use
the TCP timestamp to detect when a spurious recovery episode is
triggered due to reordering, and back out the cwnd/ssthresh
decrease.

What it currently does:
 * Detects spurious Fast Retransmit/Retransmission Timer episodes.
 * Backs out the cwnd/ssthresh decrease.

What's missing:
 * It ignores the D-SACK portions of the Detection algorithm.
 * It does not recalibrate the TCP retransmission timer after Response.
 * It does not Detect the LATE_SPUR_TO case (ACK of a retransmit).

Diff (along with some SACK changes):
http://www.sigusr1.org/~kurahone/dump/tcp-eifel-netbsd-3.99.1-20050327.diff=
.gz

Thoughts/Feedback will be appreciated,

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

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