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-><A
-NAME="NET-COMMON-PERFORMANCE-TEST">Performance Test</H1
-><TABLE
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-><PRE
-CLASS="PROGRAMLISTING"
-><SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->tcp_echo</I
-></SPAN
-> - data forwarding program for performance test</PRE
-></TD
-></TR
-></TABLE
-><P
-><B
-CLASS="COMMAND"
->tcp_echo</B
-> is one
-part of the standard performance test we use. The other parts are
-host programs <TT
-CLASS="LITERAL"
->tcp_source</TT
-> and <TT
-CLASS="LITERAL"
->tcp_sink</TT
->.
- To make these (under LINUX) cd to the tests source directory in
-the eCos repository and type “<TT
-CLASS="LITERAL"
->make -f make.linux</TT
->” -
-this should build <TT
-CLASS="LITERAL"
->tcp_source</TT
-> and <TT
-CLASS="LITERAL"
->tcp_sink</TT
->.</P
-><P
->The LINUX program “<TT
-CLASS="LITERAL"
->tcp_source</TT
->” sends
-data to the target. On the target, “<TT
-CLASS="LITERAL"
->tcp_echo</TT
->” sends
-it onwards to “<TT
-CLASS="LITERAL"
->tcp_sink</TT
->” running
-on LINUX. So the target must receive and send on all the data that <TT
-CLASS="LITERAL"
->tcp_source</TT
-> sends
-it; the time taken for this is measured and the data rate is calculated.</P
-><P
->To invoke the test, first start <TT
-CLASS="LITERAL"
->tcp_echo</TT
-> on
-the target board and wait for it to become quiescent - it will report
-work to calibrate a CPU load which can be used to simulate real
-operating conditions for the stack.</P
-><P
->Then on your LINUX machine, in one terminal window, invoke <TT
-CLASS="LITERAL"
->tcp_sink</TT
-> giving
-it the IP address (or hostname) of one interface of the target board.
- For example “<TT
-CLASS="LITERAL"
->tcp_sink 10.130.39.66</TT
->”.
- <TT
-CLASS="LITERAL"
->tcp_echo</TT
-> on the target
-will print something like “<TT
-CLASS="LITERAL"
->SINK connection
-from 10.130.39.13:1143</TT
->” when <TT
-CLASS="LITERAL"
->tcp_sink</TT
-> is
-correctly invoked.</P
-><P
->Next, in another LINUX terminal window, invoke <TT
-CLASS="LITERAL"
->tcp_source</TT
->,
-giving it the IP address (or hostname) of an interface of the target
-board, and optionally a background load to apply to the target while
-the test runs. For example, “<TT
-CLASS="LITERAL"
->tcp_source
-194.130.39.66</TT
->” to run the test with no
-additional target CPU load, or “<TT
-CLASS="LITERAL"
->tcp_source
-194.130.39.66 85</TT
->” to load it up to 85% used.
- The target load must be a multiple of 5. <TT
-CLASS="LITERAL"
->tcp_echo</TT
-> on
-the target will print something like “<TT
-CLASS="LITERAL"
->SOURCE
-connection from 194.130.39.13:1144</TT
->” when
-tcp_source is correctly invoked.</P
-><P
->You can connect tcp_sink to one target interface
-and tcp_source to another, or both to the same interface.
- Similarly, you can run <TT
-CLASS="LITERAL"
->tcp_sink</TT
-> and <TT
-CLASS="LITERAL"
->tcp_source</TT
-> on
-the same LINUX machine or different ones. TCP/IP and ARP
-look after them finding one another, as intended.</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
-><SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->nc_test_master</I
-></SPAN
-> - network characterization master
-<SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->nc_test_slave</I
-></SPAN
-> - network characterization slave</PRE
-></TD
-></TR
-></TABLE
-><P
->These tests talk to each other to measure network performance.
-They can each run on either a test target or a LINUX host computer
-given some customization to your local environment. As provided, <TT
-CLASS="LITERAL"
->nc_test_slave</TT
-> must
-run on the test target, and <TT
-CLASS="LITERAL"
->nc_test_master</TT
-> must
-be run on a LINUX host, and be given the test target's
-IP address or hostname.</P
-><P
->The tests print network performance for various packet sizes
-over UDP and TCP, versus various additional CPU loads on the target.</P
-><P
->The programs <TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
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-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
-><SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->nc6_test_slave</I
-></SPAN
->
-<SPAN
-CLASS="emphasis"
-><I
-CLASS="EMPHASIS"
->nc6_test_master</I
-></SPAN
-></PRE
-></TD
-></TR
-></TABLE
->
-are additional forms which support both IPv4 and IPv6 addressing.</P
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