NetBSD master CVS tree commits

[The Source of All Evil <source%NetBSD.ORG@localhost>]

thorpej
Wed Apr  1 14:15:52 PST 1998
Update of /cvsroot/src/sys/netinet
In directory nb00:/tmp/cvs-serv15001

Modified Files:
        tcp_output.c 
Log Message:
Implement Congestion Window Monitoring as described in the TCPIMPL
meeting of IETF #41 by Amy Hughes <ahughes%isi.edu@localhost>, and in an 
upcoming
internet draft from Hughes, Touch, and Heidemann.

CWM eliminates line-rate bursts after idle periods by counting pending
(unacknowledged) packets and limiting the congestion window to the
initial congestion window plus the pending packet count.  This has the
effect of allowing us to use the window as long as we continue to transmit,
but as soon as we stop transmitting, we go back to a slow-start (also known
as `use it or lose it').

This is not enabled by default.  You can enable this behavior by patching
the "tcp_cwm" global (set it to non-zero) or by building a kernel with the
TCP_CWM option.