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       ovs-dpctl-top - Top like behavior for ovs-dpctl dump-flows


       ovs-dpctl-top  [-h]  [-v]  [-f  FLOWFILES]  [-V]  [-s]  [--host  HOST] [-a | --accumulate]
       [--accumulate-decay ACCUMULATEDECAY] [-d DELAY]


       This program summarizes ovs-dpctl flow content by aggregating the number of packets, total
       bytes and occurrence of the following fields:

              - Datapath in_port

              - Ethernet type

              - Source and destination MAC addresses

              - IP protocol

              - Source and destination IPv4 addresses

              - Source and destination IPv6 addresses

              - UDP and TCP destination port

              - Tunnel source and destination addresses

   Output shows four values:
              - FIELDS: the flow fields for example in_port(1).

              - COUNT: the number of lines in the dump-flow output contain the flow field.

              - PACKETS: the total number of packets containing the flow field.

              -  BYTES:  the  total  number of bytes containing the flow field.  If units are not
              present then values are in bytes.

              - AVERAGE: the average packets size (BYTES/PACKET).

   Top Behavior
       While in top mode, the default behavior,  the  following  single  character  commands  are

              a - toggles top in accumulate and live mode.  Accumulate mode is described below.

              s - toggles which column is used to sort content in decreasing order.  A DESC title
              is placed over the column.

              _ - a space indicating to collect dump-flow content again

              h - halt output.  Any character will restart sampling

              f - cycle through flow fields

              q - q for quit.

   Accumulate Mode
       There are two supported modes: live and accumulate.  The default is live.   The  parameter
       --accumulate   or  the 'a' character in top mode enables the latter.  In live mode, recent
       dump-flow content is presented.  Where  as  accumulate  mode  keeps  track  of  the  prior
       historical  information  until the flow is reset not when the flow is purged.  Reset flows
       are determined when the packet count for a flow has decreased from  its  previous  sample.
       There  is  one  caveat,  eventually  the  system  will  run  out  of  memory if, after the
       accumulate-decay period any flows that have not been refreshed are purged.  The goal  here
       is  to  free  memory of flows that are not active.  Statistics are not decremented.  Their
       purpose is to reflect the overall history of the flow fields.

   Debugging Errors
       Parsing errors are counted and displayed in the  status  line  at  the  beginning  of  the
       output.   Use  the  --verbose option with --script to see what output was not parsed, like

       $ ovs-dpctl dump-flows | ovs-dpctl-top --script --verbose

       Error messages will identify content that failed to parse.

   Access Remote Hosts
       The  --host  must  follow  the  format  user@hostname.   This  script  simply  calls  'ssh
       user@Hostname'  without  checking  for  login  credentials therefore public keys should be
       installed on the system identified by hostname, such as:

       $ ssh-copy-id user@hostname

       Consult ssh-copy-id man pages for more details.

   Expected usage
       $ ovs-dpctl-top

       or to run as a script:

       $ ovs-dpctl dump-flows > dump-flows.log

       $ ovs-dpctl-top --script --flow-file dump-flows.log

       -h, --help
              show this help message and exit.

       -v, --version
              show program's version number and exit.

       -f FLOWFILES, --flow-file FLOWFILES
              file containing flows from ovs-dpctl dump-flow.

       -V, --verbose
              enable debug level verbosity.

       -s, --script
              Run from a script (no user interface).

       --host HOST
              Specify a user@host for retrieving  flows  see  Accessing  Remote  Hosts  for  more

       -a, --accumulate
              Accumulate dump-flow content.

       --accumulate-decay ACCUMULATEDECAY
              Decay  old  accumulated  flows.   The  default  is 5 minutes. A value of 0 disables

       -d DELAY, --delay DELAY
              Delay in milliseconds to collect dump-flow content (sample rate).