Hi,

 I am trying to find the maximum IO core performance with DPDK-2.2 code
using l2fwd application. I got the following number in comparison with
DPDK-1.7 code.


                       One Port              Two ports

 DPDK 2.2   14.86Mpps per port   11.8Mpps per port

 DPDK 1.7   11.8Mpps per port     11.8Mpps per port



Traffic rate from Router tester: 64bytes packet with 100% line rate
(14.86Mpps per port)

CPU Speed : 3.3GHz

NIC           : 82599ES 10-Gigabit

IO Virtualization: SR-IOV

Command used: ./l2fwd -c 3 -w 0000:02:00.1 -w 0000:02:00.0 -- -p 3 -T 1


Note:

 - Both the ports are in same NUMA node. I got the same results with full
CPU core as well as hyper-theraded core.

 - PCIe speed is same for both the ports. Attached the lspci and other
relevant output.

 - In multiple port case, each core was receiving only 11.8Mpps. This means
that RX is the bottleneck.


Questions:

 1) For two ports case, I am getting only 11.8Mpps per port compared to
single port case, for which I got line rate. What could be the reason for
this performance degradation? I was looking at the DPDK mail archive and
found the following article similar to this and couldn’t conclude anything.

http://dpdk.org/ml/archives/dev/2013-May/000115.html


 2) Did anybody try this kind of performance test for i40E NIC?


Thanks,

Swamy