oracular (8) dcb-buffer.8.gz

NAME

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

SYNOPSIS

       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 | ... }

DESCRIPTION

       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

       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.

EXAMPLE & USAGE

       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

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

SEE ALSO

       dcb(8)

REPORTING BUGS

       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

       Petr Machata <me@pmachata.org>