IBM 10/100 EtherJet User Manual page 20

Advanced information
10
– Auto Detect
The adapter detects whether its environment can support a speed of 100Mbps,
and uses that speed if possible, also it negotiates with the switch on whether to
send and receive packets at full or half duplex.
– 10Mbps/Half Duplex
The adapter uses a speed of 10Mbps and performs one operation at a time. It
either sends or receives.
– 10Mbps/Full Duplex
The adapter uses a speed of 10Mbps and sends and receives packets at the same
time. This improves the performance of your adapter. Select this mode only if
you have a full duplex switch.
– 100Mbps/Half Duplex
The adapter uses a spped of 100Mbps and performs one operation at a time. It
either sends or receives.
– 100Mbps/Full Duplex
The adapter uses a speed of 100Mbps and sends and receives packets at the
same time. This improves the performance of your adapter. Select this mode
only if you have a full duplex switch.
Locally Administered Address (LAA)
You can optionally override the factory default network address of the adapter. To
enter a new network address, type a 12-digit hexadecimal number in this box. The
address entered should be in the range of 000000000000 ? FFFFFFFFFFFF.
Exceptions: Do not use a multicast address (LSB of the high byte = 1). For
example, in the address 0X123456789AB, X cannot be an odd number. A value of
000000000000 will default to the address set at the factory.
PCI Bus Efficiency
When enabled, this option causes all transmit packets to be coalesced into a single
buffer before being sent to the network card. Because the entire frame requires only
one PCI transaction, the PCI bus is more efficient but transmit time is slightly longer.
When the option is disabled, the packets are not coalesced, and each packet requires
several PCI transactions. The PCI bus is less efficient, but transmit time is faster.
Receive Buffers
Recommended value: 32. Range: 1 – 1024.
Specifies how many buffers the driver is to use when copying data to the protocol
memory. When the network load is high, increasing receive buffers can increase
performance. The tradeoff is that this also increases the amount of system memory
used by the driver. If too few receive buffers are used, performance will suffer. If
too many are used, the driver will unnecessarily consume memory resources.