ovs-dpctl-top(8) Open vSwitch Manual ovs-dpctl-top(8)
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 num‐
ber 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
- PACKETS: the total number of packets containing the flow
- 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).
While in top mode, the default behavior, the following single character
commands are supported:
a - toggles top in accumulate and live mode. Accumulate mode is
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.
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 pre‐
sented. 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 mem‐
ory of flows that are not active. Statistics are not decremented.
Their purpose is to reflect the overall history of the flow fields.
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 this:
$ 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 there‐
fore public keys should be installed on the system identified by host‐
name, such as:
$ ssh-copy-id user@hostname
Consult ssh-copy-id man pages for more details.
or to run as a script:
$ ovs-dpctl dump-flows >gt; dump-flows.log
$ ovs-dpctl-top --script --flow-file dump-flows.log
show this help message and exit.
show program's version number and exit.
-f FLOWFILES, --flow-file FLOWFILES
file containing flows from ovs-dpctl dump-flow.
enable debug level verbosity.
Run from a script (no user interface).
Specify a user@host for retrieving flows see Accessing Remote
Hosts for more information.
Accumulate dump-flow content.
Decay old accumulated flows. The default is 5 minutes. A value
of 0 disables decay.
-d DELAY, --delay DELAY
Delay in milliseconds to collect dump-flow content (sample
Open vSwitch 2.5.90 ovs-dpctl-top(8)