# dcb-buffer(8) - man - phpMan

[DCB-BUFFER(8)](https://www.chedong.com/phpMan.php/man/DCB-BUFFER/8/markdown)                                   Linux                                  [DCB-BUFFER(8)](https://www.chedong.com/phpMan.php/man/DCB-BUFFER/8/markdown)



## NAME
       dcb-buffer - show / manipulate port buffer settings of the DCB (Data Center Bridging) subsys‐
       tem

## 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_ | _INTEGER_**K** | _INTEGER_**M** | _..._ }


## DESCRIPTION
       **dcb** **buffer** is used to configure assignment of traffic to port buffers based on traffic prior‐
       ity, 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 key‐
       word without further arguments. This instructs the tool to show the value of a given parame‐
       ter. 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)](https://www.chedong.com/phpMan.php/man/dcb/8/markdown) 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)](https://www.chedong.com/phpMan.php/man/dcb/8/markdown) for details. Keys are buffer in‐
              dices, values are sizes of that buffer in bytes.  The sizes can use the notation docu‐
              mented in section PARAMETERS at [**tc**(8)](https://www.chedong.com/phpMan.php/man/tc/8/markdown).  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)](https://www.chedong.com/phpMan.php/man/dcb/8/markdown)


## REPORTING BUGS
       Report any bugs to the Network Developers mailing list **<<netdev@vger.kernel.org>>** where the de‐
       velopment 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>>



iproute2                                  12 November 2020                             [DCB-BUFFER(8)](https://www.chedong.com/phpMan.php/man/DCB-BUFFER/8/markdown)