The problem appears to be that rxmode.mq_mode was never set to ETH_MQ_RX_RSS in testpmd.c; it?s initialized to 0. There should probably be a configuration for that, or should be set when rxq > 1.
Dan On Jan 8, 2014, at 3:24 PM, Dan Kan <dan at nyansa.com> wrote: > I'm evaluating DPDK using dpdk-1.5.1r1. I have been playing around with the > test-pmd sample app. I'm having a hard time to get RSS to work. I have a > 2-port 82599 Intel X540-DA2 NIC. I'm running the following command to start > the app. > > sudo ./testpmd -c 0x1f -n 2 -- -i --portmask=0x3 --nb-cores=4 --rxq=4 --txq=4 > > I have a packet generator that sends udp packets with various src IP. > According testpmd, I'm only receiving packets in port 0's queue 0. Packets > are not going into any other queues. I have attached the output from testpmd. > > > ------- Forward Stats for RX Port= 0/Queue= 0 -> TX Port= 1/Queue= 0 ------- > RX-packets: 1000000 TX-packets: 1000000 TX-dropped: 0 > > ---------------------- Forward statistics for port 0 ---------------------- > RX-packets: 1000000 RX-dropped: 0 RX-total: 1000000 > TX-packets: 0 TX-dropped: 0 TX-total: 0 > ---------------------------------------------------------------------------- > > ---------------------- Forward statistics for port 1 ---------------------- > RX-packets: 0 RX-dropped: 0 RX-total: 0 > TX-packets: 1000000 TX-dropped: 0 TX-total: 1000000 > ---------------------------------------------------------------------------- > > +++++++++++++++ Accumulated forward statistics for all ports+++++++++++++++ > RX-packets: 1000000 RX-dropped: 0 RX-total: 1000000 > TX-packets: 1000000 TX-dropped: 0 TX-total: 1000000 > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > On a separate note, I also find that the CPU utilization using 1 forwarding > core for 2 ports seems to be better (in the aggregate sense) than using 2 > forwarding cores for 2 ports. Running at 10gbps line rate of pktlen=400, with > 1 core, the core's utilization is 40%. With 2 cores, each core's utilization > would 30%, giving an aggregate of 60%. > > I have a use case of only doing rxonly packet processing. From my initial > test, it seems that it's more efficient to have a single core read packets > from both ports, and distribute the packet using rte_ring instead of having > each core read from its port. The rte_eth_rx operations appear to be much CPU > intensive than rte_ring_dequeue operations. > > Thanks in advance. > > Dan
