Provided by: netperf_2.6.0-2_amd64 
NAME
netperf - a network performance benchmark
SYNOPSIS
netperf [global options] -- [test specific options]
DESCRIPTION
Netperf is a benchmark that can be used to measure various aspects of networking
performance. Currently, its focus is on bulk data transfer and request/response
performance using either TCP or UDP, and the Berkeley Sockets interface. In addition,
tests for DLPI, and Unix Domain Sockets, tests for IPv6 may be conditionally compiled-in.
GLOBAL OPTIONS
-4 Use AF_INET (aka IPv4) addressing for the control and possibly data connections.
-6 Use AF_INET6 (aka IPv6) addressing for the control and possibly data connections.
-a sizespec
Alter the send and receive buffer alignments on the local system. This defaults to
8 bytes.
-A sizespec
As -a, but for the remote system.
-B brandstr
Add brandstr to the output of a test with banners disabled.
-c [rate]
Request CPU utilization and service demand calculations for the local system. If
the optional rate parameter is specified, netperf will use that instead of
calculating the rate itself.
-C [rate]
As -c, but for the remote system.
-d Increase the quantity of debugging output displayed during a test (possibly at the
expense of performance).
-D [secs,units] (*)
Display interim results at least every secs seconds uning units as the initial
guess for units per second. This is only available when netperf has been configured
with --enable-demo.
-f GMKgmk
Change the units of measure for *_STREAM tests. Capital letters are powers of two,
lowercase are powers of ten.
-F fill_file
Pre-fill the send buffers with data from the named file. This is intended to
provide a means for avoiding buffers that are filled with data which is trivially
easy to compress. A good choice for a file that should be present on any system is
this manpage - netperf.man. Other files may be provided as part of the
distribution.
-h Display a usage string, and exit.
-H name|ip,family (*)
Set the hostname (or IP address) and address family to use to establish the control
connection to the remote system. Passing a single name with no comma will only set
remote_host and will leave selection of address family for the control connection
to the stack or by a -4 -r -6 command line option.
-i max,min
Set the maximum and minimum number of iterations when trying to reach certain
confidence levels.
-j Instruct netperf to calculate additional statistics on timing when running an omni
test. Display of said statistics will depend on the presence of the corresponding
output selectors in the output selection. These are MIN_LATENCY, MAX_LATENCY,
P50_LATENCY, P90_LATENCY, P99_LATENCY, MEAN_LATENCY and STDDEV_LATENCY.
-I lvl,[,intvl]
Specify the confidence level (either 95 or 99 - 99 is the default) and the width of
the confidence interval as a percentage (default 10)
-l testlen
Specify the length of the test (default 10 seconds). A negative value sets the
number of request/response transactions, or the number of bytes for a stream test.
-L name|ip,fam (*)
Set the local name|IP and/or address family for the socket used for the control
connection to the remote netserver.
-n numcpus
Specify the number of CPU's in the system on those systems for which netperf has no
way to find the number of CPU's programatically.
-N This option will tell netperf to not establish a control connection to a remote
netserver. Instead it will try to establish a data connection directly, using only
the information supplied by the command line parameters and/or internal defaults.
Unless other ports are provided by the command line, by default the data connection
will be to the "discard" port for a "STREAM" or "SENDFILE" test, the "echo" port
for an "RR" test or the "chargen" port for a "MAERTS" test.
-o sizespec
Set an offset from the alignment specified with -a.
-O sizespec
As -o, but for the remote system.
-p portnum,locport (*)
Direct the control connection to a netserver listening on the specified port,
rather than using a "netperf" entry in /etc/services or the internal default (port
12865). If ",locport" is specified the control connection will be established from
that local port number. Specifying a single port number with no comma will specify
only the remote netserver port number and will leave local port number selection to
the stack.
-P 0|1 Show (1) or suppress (0) the test banner.
-S This option will cause an attempt to set SO_KEEPALIVE on the ends of the data
connection for tests using BSD Sockets. It will be made on the netperf side of
classic tests, and both netperf and netserver side of an omni or migrated test.
-s seconds
This will cause netperf to sleep "seconds" seconds before transferring data over
the data connection.
-t testname
Specify the test to perform. Valid testnames include, but are not limited to, nor
always compiled-in:
TCP_STREAM
TCP_SENDFILE
TCP_MAERTS
TCP_RR
TCP_CRR
UDP_STREAM
UDP_RR
DLCO_STREAM
DLCO_RR
DLCL_STREAM
DLCL_RR
STREAM_STREAM
STREAM_RR
DG_STREAM
DG_RR
SCTP_STREAM
SCTP_STREAM_MANY
SCTP_RR
SCTP_RR_MANY
LOC_CPU
REM_CPU
-T lcpu,remcpu
Request that netperf be bound to CPU lcpu and/or netserver be bound to CPU rcpu.
-v verbosity
Set the verbosity level for the test (only with -P).
-V Display the netperf version and exit.
TEST SPECIFIC OPTIONS
-h Display a usage string based on the test name set with -t, and exit.
Please consult the netperf manual Care and Feeding of Netperf 2.5.X
(doc/netperf.[pdf|html|txt]) for more information. Or you can join and send email
to netperf-talk@netperf.org.
NOTE
For those options taking two parms, at least one must be specified; specifying one value
without a comma will set both parms to that value, specifying a value with a leading comma
will set just the second parm, a value with a trailing comma will set just the first. To
set each parm to unique values, specify both and separate them with a comma.
* For these options taking two parms, specifying one value with no comma will only set the
first parm and will leave the second at the default value. To set the second value it must
be preceded with a comma or be a comma-separated pair. This is to retain previous netperf
behaviour.
BUGS
There are bound to be bugs. If you think you have found a bug, please mention it in
netperf-talk@netperf.org. List membership is required to send email to the list. See
http://www.netperf.org/cgi-bin/mailman/listinfo/netperf-talk . If all else fails send
email to netperf-feedback@netperf.org.
SEE ALSO
netserver(1)
Care and Feeding of Netperf 2.5.X
http://www.netperf.org/
AUTHORS
HP Information Networks Division - Networking Performance Team.
Rick Jones <rick.jones2@hp.com>
Karen Choy HP IND
Dave Shield <daves@csc.liv.ac.uk> (man pages)
Others too numerous to mention here - see the AUTHORS file
netperf(1)