dcb-buffer(8) — Linux manual page


DCB-BUFFER(8)                     Linux                    DCB-BUFFER(8)

NAME         top

       dcb-buffer - show / manipulate port buffer settings of the DCB
       (Data Center Bridging) subsystem

SYNOPSIS         top

       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-MAPPING := { PRIO | all }:BUFFER


       SIZE-MAPPING := { BUFFER | all }:SIZE

       PRIO := { 0 .. 7 }

       BUFFER := { 0 .. 7 }

       SIZE := { INTEGER | INTEGERK | INTEGERM | ... }

DESCRIPTION         top

       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.

PARAMETERS         top

       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.

              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.

EXAMPLE & USAGE         top

       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

       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
       total-size 1222Kb

EXIT STATUS         top

       Exit status is 0 if command was successful or a positive integer
       upon failure.

SEE ALSO         top


REPORTING BUGS         top

       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.

AUTHOR         top

       Petr Machata <me@pmachata.org>

COLOPHON         top

       This page is part of the iproute2 (utilities for controlling
       TCP/IP networking and traffic) project.  Information about the
       project can be found at 
       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
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iproute2                    12 November 2020               DCB-BUFFER(8)

Pages that refer to this page: dcb(8)