Provided by: netperf_2.5.0-1_amd64 bug


       netperf - a network performance benchmark


       netperf [global options] -- [test specific options]


       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.

       -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  -   Other  files  may  be  provided  as  part  of  the

       -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,

       -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:

       -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.

       -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


       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


       There are bound to be bugs. If you think you have  found  a  bug,  please  mention  it  in   List  membership  is  required to send email to the list.  See .  If  all  else  fails  send
       email to


       Care and Feeding of Netperf 2.5.X


       HP Information Networks Division - Networking Performance Team.
       Rick Jones     <>
       Karen Choy     HP IND
       Dave Shield    <>    (man pages)
       Others too numerous to mention here - see the AUTHORS file