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Microchip TCP/IP Stack v3.75.5 (beta)
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The udptest module
This version of the modified TCP/IP Stack distribution includes the
udptest module that implements a throughput test using UDP.
To include this module you have to define the
STACK_USE_UDPTEST in the config.h
file.
Every time that the UDPTest() function
is called it will send over the network a UDP datagram to a
broadcast address or to a specific target address defined in the
udptest.h header file
(UDP_TST_TARGET_MAC and
UDP_TST_TARGET_IP ).
Datagrams are sent to the UDP port defined by
UDP_TST_TARGET_PORT.
Datagram size is determined by the MAX_UDP_DATA
value defined in the code, and all data bytes will be filled with the
value 0x41 (A).
If you will be using a specific host address as a target is recommended
that on the target host you run a process able to listen on the UDP
target port, if there is no process listening to the port depending
on the TCP/IP implementation you may start getting back ICMP messages
reporting that the service is not available.
In Unix you can use nc or
netcat for this purpose.
WARNING: While the number of packets per second and traffic volume
this function generates is not very high, if the target address is
configured as a broadcast address, depending on the configuration of
your network or other network devices this function can produce a
broadcast storm or other undesirable network problems. Use for testing
purposes only.
The table in Figure 1 below shows the results obtained by running the
udptest module in different hardware
implementations, with different microcontrollers and clock speeds.
The image code was compiled only with the ICMP
and udptest modules and underlying protocols
(IP and UDP) and the LCD drivers if the hardware platform included a display.
The bits per second and packets per second metrics were obtained from
the interface statistics of a Cisco Catalyst switch after running the
test for more than 30 minutes for each tested device and configuration,
the target was a dual processor Pentium server running RedHat Linux.
Figure 1
[Click on the image for a larger view]
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