SMC Networks SMC EZ Card 1000 SMC9452TX - Manual (Page 33)

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RxBufSize: This is the size of the receive buffer memory space
allocated per receive descriptor (the label given to each packet
received). The default value is 2048. It should be set at 2048 to
ensure good performance when not using jumbo frames. When
using jumbo frames it should be set at 4096.
MaxRxDesc: This is the maximum number of receive descriptors
that will be allocated. This value should be at least 100. The default
value is 200.
MaxTxDesc: This is the maximum number of transmit descriptors
that will be allocated. This value should be at least 100. The default
value is 200.
<mtu-size>: This is the maximum transmission packet size and can
be increased up to 4000 bytes for effective operation. To enable the
use of jumbo frames, the mtu size can be increased by using the
ifconfig utility, as follows
#ifconfig <interface-name> mtu <mtu-size>
for example:
ifconfig eth0 mtu 3000
Assuming the card has been assigned the device name “eth0,” the
following command brings the card into an operational state:
# ifconfig eth0 up
Next the driver must be bound to an active protocol, almost always
TCP/IP, using the following command:
#ifup eth0
Note that this is meaningful only if the system can find a
configuration script that contains the necessary network info. A
sample is given below.
DEVICE=eth0
USERCTL=no
ONBOOT=yes