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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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>Performance Test</TITLE
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TITLE="Tests and Demonstrations"
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>eCos Reference Manual</TH
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><A
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 36. Tests and Demonstrations</TD
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><TD
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><DIV
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CLASS="SECT1"
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><H1
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><A
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NAME="NET-COMMON-PERFORMANCE-TEST">Performance Test</H1
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><TABLE
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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><SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tcp_echo</I
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></SPAN
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>      - data forwarding program for performance test</PRE
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></TD
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></TR
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></TABLE
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><P
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><B
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CLASS="COMMAND"
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>tcp_echo</B
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> is one
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part of the standard performance test we use.  The other parts are
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host programs <TT
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CLASS="LITERAL"
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>tcp_source</TT
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> and <TT
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CLASS="LITERAL"
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>tcp_sink</TT
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>.
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 To make these (under LINUX) cd to the tests source directory in
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the eCos repository and type &#8220;<TT
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CLASS="LITERAL"
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>make -f make.linux</TT
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>&#8221; -
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this should build <TT
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CLASS="LITERAL"
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>tcp_source</TT
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> and <TT
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CLASS="LITERAL"
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>tcp_sink</TT
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>.</P
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><P
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>The LINUX program &#8220;<TT
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CLASS="LITERAL"
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>tcp_source</TT
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>&#8221; sends
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data to the target.  On the target, &#8220;<TT
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CLASS="LITERAL"
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>tcp_echo</TT
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>&#8221; sends
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it onwards to &#8220;<TT
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CLASS="LITERAL"
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>tcp_sink</TT
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>&#8221; running
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on LINUX.  So the target must receive and send on all the data that <TT
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CLASS="LITERAL"
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>tcp_source</TT
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> sends
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it; the time taken for this is measured and the data rate is calculated.</P
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><P
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>To invoke the test, first start <TT
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CLASS="LITERAL"
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>tcp_echo</TT
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> on
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the target board and wait for it to become quiescent - it will report
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work to calibrate a CPU load which can be used to simulate real
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operating conditions for the stack.</P
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><P
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>Then on your LINUX machine, in one terminal window, invoke <TT
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CLASS="LITERAL"
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>tcp_sink</TT
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> giving
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it the IP address (or hostname) of one interface of the target board.
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 For example &#8220;<TT
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CLASS="LITERAL"
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>tcp_sink 10.130.39.66</TT
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>&#8221;.
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 <TT
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CLASS="LITERAL"
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>tcp_echo</TT
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> on the target
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will print something like &#8220;<TT
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>SINK connection
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from 10.130.39.13:1143</TT
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>&#8221; when <TT
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CLASS="LITERAL"
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>tcp_sink</TT
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> is
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correctly invoked.</P
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><P
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>Next, in another LINUX terminal window, invoke <TT
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CLASS="LITERAL"
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>tcp_source</TT
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>,
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giving it the IP address (or hostname) of an interface of the target
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board, and optionally a background load to apply to the target while
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the test runs.  For example, &#8220;<TT
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CLASS="LITERAL"
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>tcp_source
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194.130.39.66</TT
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>&#8221; to run the test with no
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additional target CPU load, or &#8220;<TT
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CLASS="LITERAL"
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>tcp_source
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194.130.39.66 85</TT
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>&#8221; to load it up to 85% used.
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 The target load must be a multiple of 5.  <TT
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CLASS="LITERAL"
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>tcp_echo</TT
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> on
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the target will print something like &#8220;<TT
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CLASS="LITERAL"
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>SOURCE
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connection from 194.130.39.13:1144</TT
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>&#8221; when
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tcp_source is correctly invoked.</P
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><P
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>You can connect tcp_sink to one target interface
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and tcp_source to another, or both to the same interface.
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 Similarly, you can run <TT
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CLASS="LITERAL"
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>tcp_sink</TT
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> and <TT
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CLASS="LITERAL"
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>tcp_source</TT
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> on
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the same LINUX machine or different ones.  TCP/IP and ARP
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look after them finding one another, as intended.</P
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><TABLE
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><PRE
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><SPAN
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><I
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CLASS="EMPHASIS"
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>nc_test_master</I
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></SPAN
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> - network characterization master
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<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>nc_test_slave</I
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></SPAN
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> - network characterization slave</PRE
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></TD
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></TR
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></TABLE
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><P
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>These tests talk to each other to measure network performance.
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They can each run on either a test target or a LINUX host computer
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given some customization to your local environment. As provided, <TT
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CLASS="LITERAL"
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>nc_test_slave</TT
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> must
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run on the test target, and <TT
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CLASS="LITERAL"
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>nc_test_master</TT
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> must
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be run on a LINUX host, and be given the test target's
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IP address or hostname.</P
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><P
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>The tests print network performance for various packet sizes
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over UDP and TCP, versus various additional CPU loads on the target.</P
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><P
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>The programs <TABLE
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><SPAN
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><I
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>nc6_test_slave</I
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></SPAN
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>
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<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>nc6_test_master</I
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></SPAN
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></PRE
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></TD
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></TR
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>
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are additional forms which support both IPv4 and IPv6 addressing.</P
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>Standalone Tests</TD
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>Up</A
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