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Driver Parameters (Linux)
■
“Set Driver Parameters (Oracle Solaris x86)” on page 51
Driver Parameters (Linux)
This table lists the tunable
bnxt_en
driver parameters for Linux OS and describes their
functions.
Keyword Valid Range Default Value Description
FlowControl 0
to
3
(
0
=none,
1
=RX only,
2
=TX only,
3
=RX
and TX)
Read from the
EEPROM .
If EEPROM is not
detected, default is 3.
Controls the automatic generation ( TX ) and response ( RX )
to Ethernet PAUSE frames.
RxDescriptiors 64
to
4096 512
Number of receive descriptors allocated by the driver.
Increasing this value allows the driver to buffer more
incoming packets. Each descriptor is 16 bytes. A receive
buffer is also allocated for each descriptor and can be either
2048, 4056, 8192, or 16384 bytes, depending on the MTU
setting. When the MTU size is 1500 or less, the receive
buffer size is 2048 bytes. When the MTU is greater than
1500, the receive buffer size is either 4056, 8192, or 16384
bytes. The maximum MTU size is 16114.
RxIntDelay 0
to
65535
(
0
=off)
72
Delays the generation of receive interrupts in units of
0.8192 microseconds. Receive interrupt reduction can
improve CPU efficiency if properly tuned for specific
network traffic. Increasing this value adds extra latency to
frame reception and can end up decreasing the throughput
of TCP traffic. If the system is reporting dropped receives,
this value might be set too high, causing the driver to run
out of available receive descriptors.
TxDescriptors 80
to
4096 256
Number of transmit descriptors allocated by the driver.
Increasing this value allows the driver to queue more
transmits. Each descriptor is 16 bytes.
XsumRX 0
to 1
1
A value of 1 indicates that the driver should enable IP
checksum offload for received packets (both UDP and
TCP) to the Ethernet adapter hardware.
Related Information
■
“Set Driver Parameters (Linux)” on page 53
■
“Set Driver Parameters (Oracle Solaris x86)” on page 51
■
“Configuring Jumbo Frames” on page 55
54 Oracle Dual Port 25 Gb Ethernet Adapter User's Guide • September 2017