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Date:      Sat, 1 Oct 2016 14:44:26 -0700
From:      Robert McMahon <rjmcmahon@rjmcmahon.com>
To:        freebsd-net@freebsd.org.
Subject:   tcpi_snd_cwnd on FreeBSD 10.3 seems incorrect
Message-ID:  <8f8460ef-90f1-61cb-9893-0f5929fbc055@rjmcmahon.com>

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I'm looking for FreeBSD expertise with respect to the net/inetnet/tcp.h.
The tcpi_snd_cwnd doesn't seem to be right. Iperf3 compiled on FreeBSD
10.3 is reporting an unrealistic congestion window

rjmcmahon@rjm-freebsd ~/Code/iperf-master $ src/iperf3 -c 192.168.100.10
-i 1 -w 1M
Connecting to host 192.168.100.10, port 5201
[ 4] local 192.168.100.22 port 55303 connected to 192.168.100.10 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 113 MBytes 949 Mbits/sec 0 294 MBytes
[ 4] 1.00-2.00 sec 112 MBytes 941 Mbits/sec 0 294 MBytes
[ 4] 2.00-3.00 sec 112 MBytes 942 Mbits/sec 0 294 MBytes
[ 4] 3.00-4.00 sec 112 MBytes 941 Mbits/sec 0 294 MBytes
[ 4] 4.00-5.00 sec 112 MBytes 941 Mbits/sec 0 294 MBytes
[ 4] 5.00-6.00 sec 112 MBytes 942 Mbits/sec 0 294 MBytes
[ 4] 6.00-7.00 sec 112 MBytes 941 Mbits/sec 0 294 MBytes
[ 4] 7.00-8.00 sec 112 MBytes 942 Mbits/sec 0 294 MBytes
[ 4] 8.00-9.00 sec 112 MBytes 941 Mbits/sec 0 294 MBytes
[ 4] 9.00-10.00 sec 112 MBytes 941 Mbits/sec 0 294 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 1.10 GBytes 942 Mbits/sec 0 sender
[ 4] 0.00-10.00 sec 1.10 GBytes 942 Mbits/sec receiver

iperf Done.

Thanks,
Bob



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