NAME | SYNOPSIS | DESCRIPTION | PARAMETERS | EXAMPLE & USAGE | EXIT STATUS | SEE ALSO | REPORTING BUGS | AUTHOR | COLOPHON |
|
|
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 <[email protected]> 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 <[email protected]>
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
[email protected], [email protected]. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-11.) 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 [email protected]
iproute2 12 November 2020 DCB-BUFFER(8)
Pages that refer to this page: dcb(8)