Hi Swamy A somewhat similar degradation (though not with l2fwd) was experienced by us as described here http://dev.dpdk.narkive.com/OL0KiHns/dpdk-dev-missing-prefetch-in-non-vector-rx-function In our case it surfaced for not using the default configuration and working in non-vector mode, and it behaved the same for both ixgbe and i40e.
/Arnon On Tue, Feb 23, 2016 at 5:24 AM, SwamZ <swamssrk at gmail.com> wrote: > 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 >
