DEVLINK-SB(8) | Linux | DEVLINK-SB(8) |
NAME¶
devlink-sb - devlink shared buffer configuration
SYNOPSIS¶
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
DESCRIPTION¶
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.
EXAMPLES¶
devlink sb show
devlink sb pool show
devlink sb port pool show pci/0000:03:00.0/1 pool 0
sudo devlink sb port pool set pci/0000:03:00.0/1 pool 0 th 15
devlink sb tc bind show pci/0000:03:00.0/1 tc 0 type ingress
sudo devlink sb tc bind set pci/0000:03:00.0/1 tc 0 type ingress pool 0 th 9
sudo devlink sb occupancy snapshot pci/0000:03:00.0
devlink sb occupancy show pci/0000:03:00.0/1
sudo devlink sb occupancy clearmax pci/0000:03:00.0
SEE ALSO¶
devlink(8), devlink-dev(8), devlink-port(8), devlink-monitor(8),
AUTHOR¶
Jiri Pirko <jiri@mellanox.com>
14 Apr 2016 | iproute2 |