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.
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.
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>
12 November 2020 | iproute2 |