1.. SPDX-License-Identifier: BSD-3-Clause 2 Copyright(c) 2015 Intel Corporation. 3 4Packet Ordering Application 5============================ 6 7The Packet Ordering sample app simply shows the impact of reordering a stream. 8It's meant to stress the library with different configurations for performance. 9 10Overview 11-------- 12 13The application uses at least three CPU cores: 14 15* RX core (main core) receives traffic from the NIC ports and feeds Worker 16 cores with traffic through SW queues. 17 18* Worker (worker core) basically do some light work on the packet. 19 Currently it modifies the output port of the packet for configurations with 20 more than one port enabled. 21 22* TX Core (worker core) receives traffic from Worker cores through software queues, 23 inserts out-of-order packets into reorder buffer, extracts ordered packets 24 from the reorder buffer and sends them to the NIC ports for transmission. 25 26Compiling the Application 27------------------------- 28 29To compile the sample application see :doc:`compiling`. 30 31The application is located in the ``packet_ordering`` sub-directory. 32 33Running the Application 34----------------------- 35 36Refer to *DPDK Getting Started Guide* for general information on running applications 37and the Environment Abstraction Layer (EAL) options. 38 39Application Command Line 40~~~~~~~~~~~~~~~~~~~~~~~~ 41 42The application execution command line is: 43 44.. code-block:: console 45 46 ./<build_dir>/examples/dpdk-packet_ordering [EAL options] -- -p PORTMASK / 47 [--disable-reorder] [--insight-worker] 48 49The -c EAL CPU_COREMASK option has to contain at least 3 CPU cores. 50The first CPU core in the core mask is the main core and would be assigned to 51RX core, the last to TX core and the rest to Worker cores. 52 53The PORTMASK parameter must contain either 1 or even enabled port numbers. 54When setting more than 1 port, traffic would be forwarded in pairs. 55For example, if we enable 4 ports, traffic from port 0 to 1 and from 1 to 0, 56then the other pair from 2 to 3 and from 3 to 2, having [0,1] and [2,3] pairs. 57 58The disable-reorder long option does, as its name implies, disable the reordering 59of traffic, which should help evaluate reordering performance impact. 60 61The insight-worker long option enables output the packet statistics of each worker thread. 62