> Also please try the nuttcp tool for bandwidth testing, as it reports the
> number of retransmits during each run.
>
> if the packets are overrunning a switch buffer somewhere in your network
> path, you can use apps like nuttcp to bandwidth limit udp sends in order
> to help troubleshoot what your maximum rate is using -R option
>
> an example
>
> server: nuttcp -S
> client: nuttcp <serveraddr>
>
> $ nuttcp server
> 22.1896 MB / 10.32 sec = 18.0368 Mbps 0 %TX 0 %RX 0 retrans 55.40
> msRTT
>
> ^^ yeah I know its slow, but it is a VPN.
I tried nuttcp in same way. I configured first time just 82574 card
with one IP address .133
root@dl44:~# ifconfig | grep addr
eth2 Link encap:Ethernet HWaddr x:x:x:09:68:1b
inet addr:x.x.185.133 Bcast:x.x.185.143 Mask:255.255.255.240
root@dl44:~# nuttcp -t y.y.74.11
582.7332 MB / 10.22 sec = 478.1161 Mbps 1 %TX 4 %RX 0 retrans 26.34 msRTT
Result is looks good = 478 mbit/s
After i reconfigured OS to use 82599 card with another IP address .135
user@dl44:~$ ifconfig | grep addr
eth1 Link encap:Ethernet HWaddr x:x:x:40:89:24
inet addr:x.x.185.135 Bcast:x.x.185.143 Mask:255.255.255.240
user@dl44:~$ nuttcp -t y.y.74.11
97.1288 MB / 10.12 sec = 80.5498 Mbps 0 %TX 1 %RX 0 retrans 28.00 msRTT
Result is same bad as for iperf with 82599 - just 80 mbit/s instead a
478mbit with 82574 card.
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