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NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | SEE ALSO | AUTHOR | COLOPHON |
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DEVLINK-SB(8) Linux DEVLINK-SB(8)
devlink-sb - devlink shared buffer configuration
devlink [ OPTIONS ] sb { COMMAND | help }
OPTIONS := { -V[ersion] | -n[no-nice-names] }
devlink sb show [ DEV [ sb SB_INDEX ] ]
devlink sb pool show [ DEV [ sb SB_INDEX ]
pool POOL_INDEX ]
devlink sb pool set DEV [ sb SB_INDEX ]
pool POOL_INDEX
size POOL_SIZE
thtype { static | dynamic }
devlink sb port pool show [ DEV/PORT_INDEX [ sb SB_INDEX ]
pool POOL_INDEX ]
devlink sb port pool set DEV/PORT_INDEX [ sb SB_INDEX ]
pool POOL_INDEX
th THRESHOLD
devlink sb tc bind show [ DEV/PORT_INDEX [ sb SB_INDEX ]
tc TC_INDEX
type { ingress | egress } ]
devlink sb tc bind set DEV/PORT_INDEX [ sb SB_INDEX ]
tc TC_INDEX
type { ingress | egress }
pool POOL_INDEX
th THRESHOLD
devlink sb occupancy show { DEV | DEV/PORT_INDEX } [ sb SB_INDEX ]
devlink sb occupancy snapshot DEV [ sb SB_INDEX ]
devlink sb occupancy clearmax DEV [ sb SB_INDEX ]
devlink sb help
devlink sb show - display available shared buffers and their
attributes
DEV - specifies the devlink device to show shared buffers. If
this argument is omitted all shared buffers of all devices are
listed.
SB_INDEX - specifies the shared buffer. If this argument is
omitted shared buffer with index 0 is selected. Behaviour of this
argument it the same for every command.
devlink sb pool show - display available pools and their attributes
DEV - specifies the devlink device to show pools. If this
argument is omitted all pools of all devices are listed.
Display available pools listing their type, size, thtype and
cell_size. cell_size is the allocation granularity of memory
within the shared buffer. Drivers may round up, round down or
reject size passed to the set command if it is not multiple of
cell_size.
devlink sb pool set - set attributes of pool
DEV - specifies the devlink device to set pool.
size POOL_SIZE
size of the pool in Bytes.
thtype { static | dynamic }
pool threshold type.
static - Threshold values for the pool will be passed in
Bytes.
dynamic - Threshold values ("to_alpha") for the pool will
be used to compute alpha parameter according to formula:
alpha = 2 ^ (to_alpha - 10)
The range of the passed value is between 0 to 20.
The computed alpha is used to determine the
maximum usage of the flow:
max_usage = alpha / (1 + alpha) *
Free_Buffer
devlink sb port pool show - display port-pool combinations and
threshold for each
DEV/PORT_INDEX - specifies the devlink port.
pool POOL_INDEX
pool index.
devlink sb port pool set - set port-pool threshold
DEV/PORT_INDEX - specifies the devlink port.
pool POOL_INDEX
pool index.
th THRESHOLD
threshold value. Type of the value is either Bytes or
"to_alpha", depends on thtype set for the pool.
devlink sb tc bind show - display port-TC to pool bindings and
threshold for each
DEV/PORT_INDEX - specifies the devlink port.
tc TC_INDEX
index of either ingress or egress TC, usually in range 0 to
8 (depends on device).
type { ingress | egress }
TC type.
devlink sb tc bind set - set port-TC to pool binding with specified
threshold
DEV/PORT_INDEX - specifies the devlink port.
tc TC_INDEX
index of either ingress or egress TC, usually in range 0 to
8 (depends on device).
type { ingress | egress }
TC type.
pool POOL_INDEX
index of pool to bind this to.
th THRESHOLD
threshold value. Type of the value is either Bytes or
"to_alpha", depends on thtype set for the pool.
devlink sb occupancy show - display shared buffer occupancy values for
device or port
This command is used to browse shared buffer occupancy values.
Values are showed for every port-pool combination as well as for
all port-TC combinations (with pool this port-TC is bound to).
Format of value is:
current_value/max_value
Note that before showing values, one has to issue occupancy
snapshot command first.
DEV - specifies the devlink device to show occupancy values for.
DEV/PORT_INDEX - specifies the devlink port to show occupancy
values for.
devlink sb occupancy snapshot - take occupancy snapshot of shared
buffer for device
This command is used to take a snapshot of shared buffer occupancy
values. After that, the values can be showed using occupancy show
command.
DEV - specifies the devlink device to take occupancy snapshot on.
devlink sb occupancy clearmax - clear occupancy watermarks of shared
buffer for device
This command is used to reset maximal occupancy values reached for
whole device. Note that before browsing reset values, one has to
issue occupancy snapshot command.
DEV - specifies the devlink device to clear occupancy watermarks
on.
devlink sb show
List available share buffers.
devlink sb pool show
List available pools and their config.
devlink sb port pool show pci/0000:03:00.0/1 pool 0
Show port-pool setup for specified port and pool.
sudo devlink sb port pool set pci/0000:03:00.0/1 pool 0 th 15
Change threshold for port specified port and pool.
devlink sb tc bind show pci/0000:03:00.0/1 tc 0 type ingress
Show pool binding and threshold for specified port and TC.
sudo devlink sb tc bind set pci/0000:03:00.0/1 tc 0 type ingress
pool 0 th 9
Set pool binding and threshold for specified port and TC.
sudo devlink sb occupancy snapshot pci/0000:03:00.0
Make a snapshot of occupancy of shared buffer for specified
devlink device.
devlink sb occupancy show pci/0000:03:00.0/1
Show occupancy for specified port from the snapshot.
sudo devlink sb occupancy clearmax pci/0000:03:00.0
Clear watermarks for shared buffer of specified devlink
device.
devlink(8), devlink-dev(8), devlink-port(8), devlink-monitor(8),
Jiri Pirko <[email protected]>
This page is part of the iproute2 (utilities for controlling
TCP/IP networking and traffic) project. Information about the
project can be found at
⟨http://www.linuxfoundation.org/collaborate/workgroups/networking/iproute2⟩.
If you have a bug report for this manual page, send it to
[email protected], [email protected]. This page was
obtained from the project's upstream Git repository
⟨https://git.kernel.org/pub/scm/network/iproute2/iproute2.git⟩ on
2025-08-11. (At that time, the date of the most recent commit
that was found in the repository was 2025-08-08.) If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to [email protected]
iproute2 14 Apr 2016 DEVLINK-SB(8)
Pages that refer to this page: devlink(8), devlink-dev(8), devlink-monitor(8), devlink-port(8), devlink-resource(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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