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TCPBENCH(1)		   OpenBSD Reference Manual		   TCPBENCH(1)

NAME
     tcpbench - TCP benchmarking and measurement tool

SYNOPSIS
     tcpbench -l
     tcpbench [-v] [-B buf] [-k kvars] [-n connections] [-p port] [-r rate]
	      [-S space] [-V rtable] hostname
     tcpbench -s [-v] [-B buf] [-k kvars] [-p port] [-r rate] [-S space]
	      [-V rtable]

DESCRIPTION
     tcpbench is a small tool that performs throughput benchmarking and
     concurrent sampling of kernel network variables.

     tcpbench is run as a client/server pair.  The server must be invoked with
     the -s flag, which will cause it to listen for incoming connections.  The
     client must be invoked with the hostname of a listening server to connect
     to.

     Once connected, the client will send TCP traffic as fast as possible to
     the server.  Both the client and server will periodically display
     throughput statistics along with any kernel variables the user has
     selected to sample (using the -k option).	A list of available kernel
     variables may be obtained using the -l option.

     The options are as follows:

     -B buf  Specify the size of the internal read/write buffer used by
	     tcpbench.	The default is 262144 bytes.

     -k kvars
	     Specify one or more kernel variables to monitor; multiple
	     variables must be separated with commas.  The default is not to
	     monitor any variables.  Using this option requires read access to
	     /dev/kmem.

     -l	     List the name of kernel variables available for monitoring and
	     exit.

     -n connections
	     Use the given number of TCP connections (default: 1).

     -p port
	     Specify the port used for the TCP test stream (default: 12345).

     -r rate
	     Specify the statistics reporting rate in milliseconds (default:
	     1000).

     -S space
	     Set the size of the socket buffer used for the TCP test stream.
	     On the client this option will resize the send buffer; on the
	     server it will resize the receive buffer.

     -s	     Place tcpbench in server mode, where it will listen on all
	     interfaces for incoming connections.

     -V rtable
	     Set the routing table to be used.	The default is 0.

     -v	     Display verbose output.  If specified more than once, increase
	     the detail of information displayed.

SEE ALSO
     netstat(1), pstat(8)

HISTORY
     The tcpbench program first appeared in OpenBSD 4.4.

AUTHORS
     The tcpbench program was written by Damien Miller <djm@openbsd.org>.

OpenBSD 4.9		       October 26, 2010			   OpenBSD 4.9

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