Allied Telesis AT-2972T/2 - Manual (Page 80)

Installing the Linux Driver Software
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The MTU size can also be changed using ifconfig after the driver is
loaded. See the ifconfig man page for details.
ˆ tx_checksum
Enables or disables hardware transmit TCP/UDP checksum. Choose
from the following selections.
ˆ 0 - checksum disabled
ˆ 1 - checksum enabled (default)
ˆ rx_checksum
Enables or disables hardware receive TCP/UDP checksum validation.
Choose from the following selections.
ˆ 0 - checksum disabled
ˆ 1 - checksum enabled (default)
ˆ 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.
ˆ 0 - scatter-gather and 64-bit DMA on x86 disabled
ˆ 1 - scatter-gather and 64-bit DMA on x86 enabled (default)
ˆ 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.
ˆ 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.