em interfaces supermicro X9SCM-F board / X9SCA-F

[Miroslav Lachman]

Sebastian Stach wrote:
> Thanks for doing the test.
>
> My conditions are different in that i have a gigabit network.
> The only difference in the iperf options is that i'm using
> -d (dualmode).
>
> On the weekend i will have time to do a test with the NICs
> set to 100MBit.
>
> Sebastian Stach

Hi,

I changed the switch to 1Gbps and run the test again.

No problems with the NICs. The iperf is running for 10 hours now. 2TB of 
data was transmitted in both directions.

I am running an endless loop on a client side

while 1
iperf -c xx.xx.xx.xx --format k -m -p 999 -t 1800 -d
sleep 5
end

------------------------------------------------------------
Server listening on TCP port 999
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to yy.yy.yy.yy, TCP port 999
TCP window size:  137 KByte (default)
------------------------------------------------------------
[  5] local xx.xx.xx.xx port 18834 connected with yy.yy.yy.yy port 999
[  4] local xx.xx.xx.xx port 999 connected with yy.yy.yy.yy port 59754
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-1800.0 sec  82823213 KBytes  376938 Kbits/sec
[  4] MSS size 1448 bytes (MTU 1500 bytes, ethernet)
[  5]  0.0-1800.0 sec  73954944 KBytes  336575 Kbits/sec
[  5] MSS size 1448 bytes (MTU 1500 bytes, ethernet)


And another endless loop on server side

while 1
iperf -s -p 999
end

------------------------------------------------------------
Server listening on TCP port 999
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[  4] local yy.yy.yy.yy port 999 connected with xx.xx.xx.xx port 18834
------------------------------------------------------------
Client connecting to xx.xx.xx.xx, TCP port 999
TCP window size: 65.0 KByte (default)
------------------------------------------------------------
[  6] local yy.yy.yy.yy port 59754 connected with xx.xx.xx.xx port 999
Waiting for server threads to complete. Interrupt again to force quit.
[ ID] Interval       Transfer     Bandwidth
[  6]  0.0-1800.0 sec  79.0 GBytes   377 Mbits/sec
[  4]  0.0-1800.0 sec  70.5 GBytes   337 Mbits/sec


Client is on the Supermicro X9SCA-F

em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 
1500 
options=4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC,VLAN_HWTSO>
         ether 00:25:90:73:d1:76
         inet xx.xx.xx.xx netmask 0xffffff80 broadcast xx.xx.xx.xx
         media: Ethernet autoselect (1000baseT <full-duplex>)
         status: active


Server is running on the Cisco UCS C200 M2

igb0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 
0 mtu 1500 
options=401bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
         ether 50:57:a8:af:eb:0a
         inet yy.yy.yy.yy netmask 0xffffff80 broadcast yy.yy.yy.yy
         media: Ethernet autoselect (1000baseT <full-duplex>)
         status: active

Both sides are running FreeBSD 8.3-RELEASE amd64 GENERIC

So the only difference is that I am using NIC em0 in shared mode for 
remote management. Can you try your test with shared mode?

Miroslav Lachman