These variables must be set before loading the driver, either via
loader.conf(5)
or through the use of
kenv(1).
They are all prefixed by
dev.X.Y.iflibamp;.
where X is the driver name, and Y is the instance number.
|
| override_nrxds
|
| |
Override the number of RX descriptors for each queue.
The value is a comma separated list of positive integers.
Some drivers only use a single value, but others may use more.
These numbers must be powers of two, and zero means to use the default.
Individual drivers may have additional restrictions on allowable values.
Defaults to all zeros.
|
| override_ntxds
|
| |
Override the number of TX descriptors for each queue.
The value is a comma separated list of positive integers.
Some drivers only use a single value, but others may use more.
These numbers must be powers of two, and zero means to use the default.
Individual drivers may have additional restrictions on allowable values.
Defaults to all zeros.
|
| override_qs_enable
|
| |
When set, allows the number of transmit and receive queues to be different.
If not set, the lower of the number of TX or RX queues will be used for both.
|
| override_nrxqs
|
| |
Set the number of RX queues.
If zero, the number of RX queues is derived from the number of cores on the
socket connected to the controller.
Defaults to 0.
|
| override_ntxqs
|
| |
Set the number of TX queues.
If zero, the number of TX queues is derived from the number of cores on the
socket connected to the controller.
|
| disable_msix
|
| |
Disables MSI-X interrupts for the device.
|
| core_offset
|
| |
Specifies a starting core offset to assign queues to.
If the value is unspecified or 65535, cores are assigned sequentially across
controllers.
|
| separate_txrx
|
| |
Requests that RX and TX queues not be paired on the same core.
If this is zero or not set, an RX and TX queue pair will be assigned to each
core.
When set to a non-zero value, TX queues are assigned to cores following the
last RX queue.
|
|
These
sysctl(8)
variables can be changed at any time:
| tx_abdicate
|
| |
Controls how the transmit ring is serviced.
If set to zero, when a frame is submitted to the transmission ring, the same
task that is submitting it will service the ring unless there's already a
task servicing the TX ring.
This ensures that whenever there is a pending transmission,
the transmit ring is being serviced.
This results in higher transmit throughput.
If set to a non-zero value, task returns immediately and the transmit
ring is serviced by a different task.
This returns control to the caller faster and under high receive load,
may result in fewer dropped RX frames.
|
| rx_budget
|
| |
Sets the maximum number of frames to be received at a time.
Zero (the default) indicates the default (currently 16) should be used.
|
|
There are also some global sysctls which can change behaviour for all drivers,
and may be changed at any time.
| net.iflib.min_tx_latency
|
| |
If this is set to a non-zero value, iflib will avoid any attempt to combine
multiple transmits, and notify the hardware as quickly as possible of
new descriptors.
This will lower the maximum throughput, but will also lower transmit latency.
|
| net.iflib.no_tx_batch
|
| |
Some NICs allow processing completed transmit descriptors in batches.
Doing so usually increases the transmit throughput by reducing the number of
transmit interrupts.
Setting this to a non-zero value will disable the use of this feature.
|
|
These
sysctl(8)
variables are read-only:
| driver_version
|
| |
A string indicating the internal version of the driver.
|
|
There are a number of queue state
sysctl(8)
variables as well:
| txqZ
|
| |
The following are repeated for each transmit queue, where Z is the transmit
queue instance number:
|
| r_abdications
|
| |
Number of consumer abdications in the MP ring for this queue.
An abdication occurs on every ring submission when tx_abdicate is true.
|
| r_restarts
|
| |
Number of consumer restarts in the MP ring for this queue.
A restart occurs when an attempt to drain a non-empty ring fails,
and the ring is already in the STALLED state.
|
| r_stalls
|
| |
Number of consumer stalls in the MP ring for this queue.
A stall occurs when an attempt to drain a non-empty ring fails.
|
| r_starts
|
| |
Number of normal consumer starts in the MP ring for this queue.
A start occurs when the MP ring transitions from IDLE to BUSY.
|
| r_drops
|
| |
Number of drops in the MP ring for this queue.
A drop occurs when there is an attempt to add an entry to an MP ring with
no available space.
|
| r_enqueues
|
| |
Number of entries which have been enqueued to the MP ring for this queue.
|
| ring_state
|
| |
MP (soft) ring state.
This privides a snapshot of the current MP ring state, including the producer
head and tail indexes, the consumer index, and the state.
The state is one of "IDLE", "BUSY",
"STALLED", or "ABDICATED".
|
| txq_cleaned
|
| |
The number of transmit descriptors which have been reclaimed.
Total cleaned.
|
| txq_processed
|
| |
The number of transmit descriptors which have been processed, but may not yet
have been reclaimed.
|
| txq_in_use
|
| |
Descriptors which have been added to the transmit queue,
but have not yet been cleaned.
This value will include both untransmitted descriptors as well as descriptors
which have been processed.
|
| txq_cidx_processed
|
| |
The transmit queue consumer index of the next descriptor to process.
|
| txq_cidx
|
| |
The transmit queue consumer index of the oldest descriptor to reclaim.
|
| txq_pidx
|
| |
The transmit queue producer index where the next descriptor to transmit will
be inserted.
|
| no_tx_dma_setup
|
| |
Number of times DMA mapping a transmit mbuf failed for reasons other than
EFBIG.
|
| txd_encap_efbig
|
| |
Number of times DMA mapping a transmit mbuf failed due to requiring too many
segments.
|
| tx_map_failed
|
| |
Number of times DMA mapping a transmit mbuf failed for any reason
(sum of no_tx_dma_setup and txd_encap_efbig)
|
| no_desc_avail
|
| |
Number of times a descriptor couldn't be added to the transmit ring because
the transmit ring was full.
|
| mbuf_defrag_failed
|
| |
Number of times both
m_collapse(9)
and
m_defrag(9)
failed after an
EFBIG
error
result from DMA mapping a transmit mbuf.
|
| m_pullups
|
| |
Number of times
m_pullup(9)
was called attempting to parse a header.
|
| mbuf_defrag
|
| |
Number of times
m_defrag(9)
was called.
|
|
| rxqZ
|
| |
The following are repeated for each receive queue, where Z is the
receive queue instance number:
|
| rxq_fl0.credits
|
| |
Credits currently available in the receive ring.
|
| rxq_fl0.cidx
|
| |
Current receive ring consumer index.
|
| rxq_fl0.pidx
|
| |
Current receive ring producer index.
|
|
Additional OIDs useful for driver and iflib development are exposed when the
INVARIANTS and/or WITNESS options are enabled in the kernel.
