testpmd drops many packets

[zengxg14 <zengxg14-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hi.

I use testpmd to test the throughput, but it drops many packets.

Here is my hardware:
Intel Xeon E5645,   2 sockets,  HT is closed, the total cores number is 12.
64GB memory
Intel 82599EB SFP+,  only one port.
Redhat 6.3 (2.6.32-279.el6.x86_64)
ixia send packets, line rate with 200 bytes packet. Packets are have random source ip and dest ip.

The command i run:
 ./testpmd -c fff -n 3 -- -i  --coremask=1e --portmask=1 --rss-ip --rxq 4 --txq 4 --rxd 2048 --txd 2048 --burst 512
The coremask set to 1e, so i can use 4 cores to receive packets from 4 queues.

Set the engine to rx_only_engine.
         struct fwd_engine *cur_fwd_eng = &rx_only_engine;

I also changed testpmd.c and ixgbe_82599.c to make it run.  
Here is what i changed:
(1) In main(), I delete the function rte_igb_pmd_init(), SSH need to use igb nic.

(2) In fucntion init_config(), i reset the nb_mbuf_per_pool. I have to, otherwise the testpmd tells alloc rx mbufs failed.
nb_mbuf_per_pool = (nb_rxd + (nb_lcores * mb_mempool_cache) +
                nb_txd + MAX_PKT_BURST) * nb_rxq;

(3) In lib/librte_pmd_ixgbe/ixgbe/ixgbe_82599.c, function "ixgbe_setup_sfp_modules_82599".
I comment this three lines.

//                      DEBUGOUT("sfp module setup not complete\n");
//                      ret_val = IXGBE_ERR_SFP_SETUP_NOT_COMPLETE;
//                      goto setup_sfp_out;

I don't know why the "sfp module setup not complete", I simply comment them to make ixgbe can be  init. 

Run the command, use ixia send some packets after start. Here is the output.

testpmd> start
  rxonly packet forwarding - CRC stripping disabled - packets/burst=512
  nb forwarding cores=4 - nb forwarding ports=1
  RX queues=4 - RX desc=2048 - RX free threshold=0
  RX threshold registers: pthresh=8 hthresh=8 wthresh=4
  TX queues=4 - TX desc=2048 - TX free threshold=0
  TX threshold registers: pthresh=36 hthresh=0 wthresh=0
  TX RS bit threshold=0
testpmd> show port stats 0

  ######################## NIC statistics for port 0  ########################
  RX-packets: 737543992  RX-errors: 393984575 RX-bytes: 68719476735
  TX-packets: 0          TX-errors: 0         TX-bytes: 0
  ############################################################################
testpmd> quit





zengxg14

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