Manual

Chapter 6: Installing the Linux Driver Software
80
is the standard Ethernet (non-jumbo) MTU size. Note that the MTU
size excludes the Ethernet header size of 14 bytes. Actual frame
size is MTU size + 14 bytes.
The MTU size can also be changed using ifconfig after the driver is
loaded. See the ifconfig man page for details.
 tx_checksum
Enables or disables hardware transmit TCP/UDP checksum.
Choose from the following selections:
– 0 - checksum disabled
– 1 - checksum enabled (default)
 rx_checksum
Enables or disables hardware receive TCP/UDP checksum
validation. Choose from the following selections:
– 0 - checksum disabled
– 1 - checksum enabled (default)
 scatter_gather
Enables or disables scatter-gather and 64-bit DMA on x86. This
option is only useful when running on TUX-enabled kernels or
kernels with zero-copy TCP. Choose from the following selections:
– 0 - scatter-gather and 64-bit DMA on x86 disabled
– 1 - scatter-gather and 64-bit DMA on x86 enabled
(default)
 tx_pkt_desc_cnt
Configures the number of transmit descriptors. Default is 100. The
valid range is from 1 to 600. Depending on kernel and system
architecture, the driver may require up to 268 bytes per descriptor.
Note that the driver may not be able to allocate the required
amount of memory if this parameter is set too high. This parameter
should not be set less than 80 if adaptive_coalesce (see below) is
enabled.
 rx_std_desc_cnt
Configures the number of receive descriptors for frames up to
1528 bytes. Default is 200. The valid range is from 1 to 511. This
parameter should not be set less than 80 on systems with high
network traffic. Setting this parameter higher allows the NIC to
buffer larger bursts of network traffic without dropping frames,
especially on slower systems. Note that the driver may not be able
to allocate the required amount of memory if this parameter is set
too high. This parameter should not be set less than 50 if
adaptive_coalesce (see below) is enabled.