I am trying to set up dummynet with FreeBSD 9.3 and a 10 GB Fibre over
ethernet NIC (ix drivers).
Dummynet appears to have a limit of 1.25 gigabits a second, and when I
start setting extremely large pipe values I start running into:
ipfw: bandwidth too large
It doesn't like(in /etc/ipfw.rules)
$IPFWcmd pipe 10 config bw 8000Mbits
but for some reason it likes
$IPFWcmd pipe 20 config bw 100000Mbits
and
$IPFWcmd pipe 10 config bw 10000Mbits
even if there is no notcable performance diffrence betwen them
$ iperf -c load-server2
------------------------------------------------------------
Client connecting to load-server2, TCP port 5001
TCP window size: 434 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.20.25 port 56122 connected with 192.168.20.20 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.57 GBytes 1.35 Gbits/sec
$ iperf -c load-server1
------------------------------------------------------------
Client connecting to load-server1, TCP port 5001
TCP window size: 459 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.20.20 port 49028 connected with 192.168.20.25 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.36 GBytes 1.17 Gbits/sec
testing is done on a private subnet which houses nothing more than two
loading servers and a FreeBSD bridge in between. All machines have 10
GB/sec ix driver cards.
Now, same set up, but commenting out all dummynet refrences in ipfw.rules:
$ iperf -c load-server1
------------------------------------------------------------
Client connecting to load-server1, TCP port 5001
TCP window size: 459 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.20.20 port 49029 connected with 192.168.20.25 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 8.44 GBytes 7.24 Gbits/sec
$ iperf -c load-server2
------------------------------------------------------------
Client connecting to load-server2, TCP port 5001
TCP window size: 434 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.20.25 port 56123 connected with 192.168.20.20 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 7.89 GBytes 6.78 Gbits/sec
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