Solarflare Solarflare XtremeScale series, User Manual, Page: 323 / 400

Solarflare Server Adapter User Guide
Solarflare Adapters on FreeBSD
Issue 20 © Solarflare Communications 2017 316
lro.slow_start_packets Number of packets that must pass in ‐ order
before starting LRO.
uint 20000
lro.loss_packets Number of packets that must pass in ‐ order
following loss before restarting LRO.
uint 20
tx_dpl_get_max Maximum number of packets queued in the
software get ‐ list for a transmit queue.
The get ‐ list is used to get packets to be put
onto the Tx ring. It should be big enough to
avoid drops of locally generated TCP packets
when many (1000+) streams are running in
parallel. Accessing this list requires the
transmit queue lock.
If a packet is dropped because this limit has
been exceeded, the sender gets an
ENOBUFS
error, and the
tx_get_overflow
counter
grows.
uint 65536
tx_dpl_get_non_tcp_max Maximum number of non ‐ TCP packets queued
in the software get ‐ list for a transmit queue.
This parameter can restrict utilizing the queue
for non ‐ TCP (e.g. UDP) packets, which can
easily overflow any queue because there is no
back ‐ pressure.
If a packet is dropped because this limit has
been exceeded, the sender gets an
ENOBUFS
error, and the
tx_get_non_tcp_overflow
counter grows.
uint 1024
tx_dpl_put_max Maximum number of packets queued in the
software put ‐ list for a transmit queue.
The put ‐ list is used to put packets temporarily
when the transmit queue lock cannot be
obtained. The packets are moved to the get ‐ list
as soon as the transmit queue lock is acquired
and the queue is served.
If a packet is dropped because this limit has
been exceeded, the sender gets an
ENOBUFS
error, and the
tx_put_overflow
counter
grows.
uint 1024
Table 77: Driver Module Parameters
Parameter Description Possible
Value
Default
Value