Datagram test shows low success rate with Exalogic configuration (IB)

The success rate from our Coherence datagram test is kind of low with Exalogic configuration
## with IB interface ##
throughput: 1014 MB/sec
16236 packets/sec
received: 300000 of 779167
missing: 479167
success rate: 0.38502657
## with 1G ethernet ##
ethernet throughput: 97 MB/sec
69141 packets/sec
received: 1600000 of 1885461
missing: 285461
success rate: 0.84859884
The listener Coherence node has
bond0 Link encap:InfiniBand HWaddr 80:00:00:4A:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00
inet addr:192.168.34.91 Bcast:192.168.39.255 Mask:255.255.248.0
inet6 addr: fe80::221:2800:1a0:ebf9/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:65520 Metric:1
RX packets:23621494301 errors:0 dropped:0 overruns:0 frame:0
TX packets:23218231154 errors:0 dropped:1779 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:41399991507456 (37.6 TiB) TX bytes:36726866951912 (33.4 TiB)
The Coherence publisher node has
bond0 Link encap:InfiniBand HWaddr 80:00:00:4A:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00
inet addr:192.168.34.90 Bcast:192.168.39.255 Mask:255.255.248.0
inet6 addr: fe80::221:2800:1a0:fb55/64 Scope:Link
UP BROADCAST RUNNING MASTER MULTICAST MTU:65520 Metric:1
RX packets:23781098798 errors:0 dropped:0 overruns:0 frame:0
TX packets:24186487356 errors:0 dropped:2229 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:39474424472056 (35.9 TiB) TX bytes:44425819197666 (40.4 TiB)
Is there anything needs to be tuned/configured to use InfiniBand? Or any suggestions to resolve the issue?
Thanks in advance.

Hi,
Is important that the IB NIC have it's MTU set to the maximum allowed value of just under 64KB to get the best performance.
Try throttling the test to just under the data rate the test achieved by adding -txRate to the test parameters. You can continue to lower the throttle until packet loss is less then 1%. Coherence will do the same thing automatically to avoid the packet loss. Also you should plan on running a number of nodes on each blade to help spread the network load over more CPUs.
For further information about the -txRate option, please take a look at http://docs.oracle.com/cd/E18686_01/coh.37/e18679/tune_datagramtest.htm
Also, as can be seen at http://docs.oracle.com/cd/E18476_01/doc.220/e18480/solaris.htm note that Coherence on Oracle Exalogic dynamically adjusts buffering to the MTU of the interface. To use dynamic buffering, you must run the following parameters:
ndd -set /dev/ip ip_reass_queue_bytes 16777216
ndd -set /dev/tcp tcp_max_buf 8388608
ndd -set /dev/udp udp_max_buf 8388608
This applied for Linux Exalogic too.
Hope this helps.
Thanks,
Cris

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