Hello,
we are trying to send packets from the testpmd to another machine
with DPDK running.
We are building custom packets before sending it on the wire.
After running the application the TX-dropped is quite high (can be
inferred from following logs : )
$ sudo ./testpmd -c f -w 01:00.1 -- --nb-cores=2
--eth-peer=0,A4:BF:01:37:23:AB --rxq=1 --txq=1
Port statistics ====================================
######################## NIC statistics for port 0
########################
RX-packets: 1445150 RX-missed: 0 RX-bytes: 86709064
RX-errors: 0
RX-nombuf: 0
TX-packets: 1602045 TX-errors: 0 TX-bytes: 134571780
Throughput (since last show)
Rx-pps: 0
Tx-pps: 0
############################################################################
---------------------- Forward statistics for port 0
----------------------
RX-packets: 1445160 RX-dropped: 0 RX-total: 1445160
TX-packets: 1602045 TX-dropped: 694971472 TX-total: 696573517
----------------------------------------------------------------------------
+++++++++++++++ Accumulated forward statistics for all
ports+++++++++++++++
RX-packets: 1445160 RX-dropped: 0 RX-total: 1445160
TX-packets: 1602045 TX-dropped: 694971472 TX-total: 696573517
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
What could be the reason for such packet drop? What tuning of
buffer/queue size affects this ?
How to set optimal setting for high performance?
System specification :
2 machines with
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
Kernel: 4.15.0-29-generic
DPDK: 19.05.0
Hardware:
CPU: Intel(R) Xeon(R) CPU E5-2650 v4 @ 2.20GHz
NIC 1: Intel Corporation Ethernet Controller XL710 for 40GbE QSFP+ (i40e)
NIC 2: Intel Corporation I350 Gigabit Network Connection (igb)
Regards,
Nilesh
