ifpps man page on Oracle

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IFPPS(8)		      netsniff-ng toolkit		      IFPPS(8)

       ifpps - top-like networking and system statistics

       ifpps { [options] | [device] }

       ifpps  is a small utility which periodically provides top-like network‐
       ing and system statistics from  the  kernel.  ifpps  gathers  its  data
       directly from procfs files and does not make use of any user space mon‐
       itoring libraries which would falsify statistics under high load.

       For instance, consider the following scenario: two  directly  connected
       Linux machines with Intel Core 2 Quad Q6600 2.40GHz CPUs, 4 GB RAM, and
       an Intel 82566DC-2 Gigabit Ethernet NIC are used for performance evalu‐
       ation.  One machine generates 64 byte network packets by using the ker‐
       nel space packet generator pktgen with a maximum possible packet	 rate.
       The other machine displays statistics about incoming network packets by
       using i) iptraf(8) and ii) ifpps.

       iptraf which incorporates pcap(3)  shows	 an  average  packet  rate  of
       246,000	pps while on the other hand ifpps shows an average packet rate
       of 1,378,000 pps. Hence, due to packet copies and deferring  statistics
       creation into user space, a measurement error of approximately 460 per‐
       cent occurs. Tools like iptraf might display much more information such
       as TCP per flow statistics (hence the use of the pcap library). This is
       not possible with ifpps, because overall networking statistics are  its
       focus;  statistics,  which  are	also fairly reliable under high packet

       ifpps also periodically displays CPU load, interrupt,  software	inter‐
       rupt data per sample interval as well as total interrupts, all per CPU.
       In case the number of CPUs exceeds 5 or the  number  specified  by  the
       user  with  the	“-n” command line option, ifpps will only display this
       number top heavy hitters. The topmost heavy hitter CPU will  be	marked
       with  “+”.   The	 least	heavy  hitter  will always be displayed and is
       marked with “-”. In addition, the average for  all  the	above  per-CPU
       data  is shown. Optionally the median values can be displayed using the
       “-m” command line option.

       ifpps also supports directly the gnuplot(1) data	 sample	 format.  This
       facilitates creation of gnuplot figures from ifpps time series.

   -d <netdev>, --dev <netdev>
       Networking device to fetch statistics from, for example eth0, wlan0.

   -n, --num-cpus
       Set  maximum  number of top hitter CPUs (in terms of time spent in sys‐
       tem/user mode) to display in ncurses mode, default is 10.

   -t <time>, --interval <time>
       Statistics refresh interval in milliseconds, default is 1000ms.

   -c, --csv
       Output (once) the ncurses data  to  the	terminal  as  gnuplot(1)-ready

   -l, --loop
       Continuously  output  the  terminal data after a refresh interval. This
       option is only available, if option “-c” is given. For “-l” it is  usu‐
       ally  recommended  to  redirect the output into a file that is to be be
       processed later with gnuplot(1).

   -m, --median
       Show median values across all CPUs for CPU load, interrupts (per inter‐
       val and absolute) and software interrupts.

   -p, --promisc
       Turn on promiscuous mode for the given networking device.

   -W, --no-warn
       Suppress	 possible warnings in the ncurses output, e.g. about a too low
       sampling interval that could cause performance regression.

   -v, --version
       Show version information.

   -h, --help
       Show user help.

   ifpps eth0
       Default ncurses output for the eth0 device.

   ifpps -pd eth0
       Ncurses output for the eth0 device in promiscuous mode.

   ifpps -lpcd wlan0 > plot.dat
       Continuous terminal output for the wlan0 device in promiscuous mode.

       On 10Gbit/s cards or higher, receive and transmit statistics  are  usu‐
       ally  accumulated at a higher duration interval than 1 second. Thus, it
       might be advisable to alter the timing to a higher accumulation	inter‐
       val for such cards.

       ifpps is licensed under the GNU GPL version 2.0.

       ifpps  was  originally  written	for  the netsniff-ng toolkit by Daniel
       Borkmann. It is currently maintained by Tobias  Klauser	<tklauser@dis‐
       tanz.ch> and Daniel Borkmann <dborkma@tik.ee.ethz.ch>.

       netsniff-ng(8),	  trafgen(8),	mausezahn(8),	bpfc(8),   flowtop(8),
       astraceroute(8), curvetun(8)

       Manpage was written by Daniel Borkmann.

       This page is part of the Linux netsniff-ng toolkit project. A  descrip‐
       tion of the project, and information about reporting bugs, can be found
       at http://netsniff-ng.org/.

Linux				 03 March 2013			      IFPPS(8)

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