.\" $OpenBSD: tcpbench.1,v 1.10 2010/10/26 20:26:37 fkr Exp $
.\"
.\" Copyright (c) 2008 Damien Miller <djm@mindrot.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: October 26 2010 $
.Dt TCPBENCH 1
.Os
.Sh NAME
.Nm tcpbench
.Nd TCP benchmarking and measurement tool
.Sh SYNOPSIS
.Nm
.Fl l
.Nm
.Op Fl v
.Op Fl B Ar buf
.Op Fl k Ar kvars
.Op Fl n Ar connections
.Op Fl p Ar port
.Op Fl r Ar rate
.Op Fl S Ar space
.Op Fl V Ar rtable
.Ar hostname
.Nm
.Bk -words
.Fl s
.Op Fl v
.Op Fl B Ar buf
.Op Fl k Ar kvars
.Op Fl p Ar port
.Op Fl r Ar rate
.Op Fl S Ar space
.Op Fl V Ar rtable
.Ek
.Sh DESCRIPTION
.Nm
is a small tool that performs throughput benchmarking and concurrent
sampling of kernel network variables.
.Pp
.Nm
is run as a client/server pair.
The server must be invoked with the
.Fl s
flag, which will cause it to listen for incoming connections.
The client must be invoked with the
.Ar hostname
of a listening server to connect to.
.Pp
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
.Fl k
option).
A list of available kernel variables may be obtained using the
.Fl l
option.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl B Ar buf
Specify the size of the internal read/write buffer used by
.Nm .
The default is 262144 bytes.
.It Fl k Ar 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
.Pa /dev/kmem .
.It Fl l
List the name of kernel variables available for monitoring and exit.
.It Fl n Ar connections
Use the given number of TCP connections (default: 1).
.It Fl p Ar port
Specify the port used for the TCP test stream (default: 12345).
.It Fl r Ar rate
Specify the statistics reporting rate in milliseconds (default: 1000).
.It Fl S Ar 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.
.It Fl s
Place
.Nm
in server mode, where it will listen on all interfaces for incoming
connections.
.It Fl V Ar rtable
Set the routing table to be used.
The default is 0.
.It Fl v
Display verbose output.
If specified more than once, increase the detail of information displayed.
.El
.Sh SEE ALSO
.Xr netstat 1 ,
.Xr pstat 8
.Sh HISTORY
The
.Nm
program first appeared in
.Ox 4.4 .
.Sh AUTHORS
The
.Nm
program was written by
.An Damien Miller Aq djm@openbsd.org .