DCB-BUFFER(8) (12 November 2020) DCB-BUFFER(8)
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 }
SIZE-MAP := [ SIZE-MAP ] SIZE-MAPPING
SIZE-MAPPING := { BUFFER | all }
PRIO := { 0 .. 7 }
BUFFER := { 0 .. 7 }
SIZE := { INTEGER | INTEGERK |
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 configu-
ration, 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
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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 nota-
tion 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)
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REPORTING BUGS
Report any bugs to the Network Developers mailing list
<netdev@vger.kernel.org> where the development and mainte-
nance is primarily done. You do not have to be subscribed
to the list to send a message there.
AUTHOR
Petr Machata <me@pmachata.org>
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