[Bug 264198] bridge, ipfw: very slow network on bridge with IPFW, virtio or vtnet on 12.3-RELEASE-p5

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264198

--- Comment #4 from Ole <ol@dbconn.net> ---
I could reduce it even more. Seems that the vlan play no role here. I picked
one VM on the hosts. Stopped IPFW on the hosts so network is fine. Then I
crated a bridge and an epair like before:

vtnet0---bridge0---epaira0---epairb0


vm # ifconfig bridge create mtu 1400
vm # ifconfig epair create mtu 1400
vm #  ifconfig bridge0 addm epair0a
vm # ifconfig bridge0 addm vtnet0
vm # ifconfig epair0a up
vm # ifconfig epair0b inet <IP_ADDR>/28 mtu 1400 up
vm # ifconfig bridge0 up
vm # nc -v -l 2222 > /dev/null

again, the only rule is
vm # ipfw list
65535 allow ip from any to any

from another host (in the same network) I send data with nc:
dd if=/dev/zero bs=1024k count=6 | nc -v <IP_ADDR> 2222

result:
6291456 bytes transferred in 70.693446 secs (88996 bytes/sec)

after 'service ipfw stop' on vm-a, it is about 700 times faster )-:
6291456 bytes transferred in 0.100673 secs (62493675 bytes/sec)


So I think the problem is related to IPFW and bridges. Maybe the MTU plays a
role here.

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