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NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | EXAMPLE & USAGE | EXIT STATUS | SEE ALSO | REPORTING BUGS | AUTHOR | COLOPHON |
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DCB-BUFFER(8) Linux DCB-BUFFER(8)
dcb-buffer - show / manipulate port buffer settings of the DCB
(Data Center Bridging) subsystem
dcb [ OPTIONS ] buffer { COMMAND | help }
dcb buffer show dev DEV [ prio-buffer ] [ buffer-size ] [ total-
size ]
dcb buffer set dev DEV [ prio-buffer PRIO-MAP ] [ buffer-size
SIZE-MAP ]
PRIO-MAP := [ PRIO-MAP ] PRIO-MAPPING
PRIO-MAPPING := { PRIO | all }:BUFFER
SIZE-MAP := [ SIZE-MAP ] SIZE-MAPPING
SIZE-MAPPING := { BUFFER | all }:SIZE
PRIO := { 0 .. 7 }
BUFFER := { 0 .. 7 }
SIZE := { INTEGER | INTEGERK | INTEGERM | ... }
dcb buffer is used to configure assignment of traffic to port
buffers based on traffic priority, and sizes of those buffers. It
can be also used to inspect the current configuration, as well as
total device memory that the port buffers take.
For read-write parameters, the following describes only the write
direction, i.e. as used with the set command. For the show
command, the parameter name is to be used as a simple keyword
without further arguments. This instructs the tool to show the
value of a given parameter. When no parameters are given, the tool
shows the complete buffer configuration.
total-size
A read-only property that shows the total device memory
taken up by port buffers. This might be more than a simple
sum of individual buffer sizes if there are any hidden or
internal buffers.
prio-buffer PRIO-MAP
PRIO-MAP uses the array parameter syntax, see dcb(8) for
details. Keys are priorities, values are buffer indices.
For each priority sets a buffer where traffic with that
priority is directed to.
buffer-size SIZE-MAP
SIZE-MAP uses the array parameter syntax, see dcb(8) for
details. Keys are buffer indices, values are sizes of that
buffer in bytes. The sizes can use the notation documented
in section PARAMETERS at tc(8). Note that the size
requested by the tool can be rounded or capped by the
driver to satisfy the requirements of the device.
Configure the priomap in a one-to-one fashion:
# dcb buffer set dev eth0 prio-buffer 0:0 1:1 2:2 3:3 4:4 5:5 6:6
7:7
Set sizes of all buffers to 10KB, except for buffer 6, which will
have the size 1MB:
# dcb buffer set dev eth0 buffer-size all:10K 6:1M
Show what was set:
# dcb buffer show dev eth0
prio-buffer 0:0 1:1 2:2 3:3 4:4 5:5 6:6 7:7
buffer-size 0:10Kb 1:10Kb 2:10Kb 3:10Kb 4:10Kb 5:10Kb 6:1Mb 7:10Kb
total-size 1222Kb
Exit status is 0 if command was successful or a positive integer
upon failure.
dcb(8)
Report any bugs to the Network Developers mailing list
<netdev@vger.kernel.org> where the development and maintenance is
primarily done. You do not have to be subscribed to the list to
send a message there.
Petr Machata <me@pmachata.org>
This page is part of the iproute2 (utilities for controlling
TCP/IP networking and traffic) project. Information about the
project can be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
netdev@vger.kernel.org, shemminger@osdl.org. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-08.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
iproute2 12 November 2020 DCB-BUFFER(8)
Pages that refer to this page: dcb(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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