*) check and compare tcpdump
for the FreeBSD hosts on the receiver side, it showed a lot of window
size changes and from time to time a lot of duplicate ACKs. i will file
a PR (as Adrian asked) and see to get a matching tcpdump and SIFTR output.
*) can you check which ping-sizes work?
ping -s 1472
ping -D -s 1472 (should work if you have a mtu of 1500 all over the
way)
*) any offloading/supported used at the network-card?
*) try a rate-shaping queue outgoing (not really good - as shaping works
best on incomming interfaces):
you need dummynet (and ipfw for this example):
ipfw add pipe 1 all from ....
ipfw pipe 1 config bw 10Mbit/s queue 50Kbytes
(adjust queue size ~40ms at rated speed)
Kind regards,
Ingo Flaschberger
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