HP 441877-00B Software And Configuration Manual page 84

Default: 8, corresponding to 32 bytes or 8 dwords in the receive FIFO.
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Normal Behavior: No message will be displayed. The driver will use the specified value to
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configure.
Possible Errors: If the RXFIFO parameter is set to an invalid value, the parameter is ignored and
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the default value is used, and a message indicates a "Parameter value out of range" error.
TXFIFO
Syntax: TXFIFO=[0..15 | 0x0..0xF]
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Example: TXFIFO=8
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Default: 8, corresponding to 32 bytes or 8 dwords in the transmit FIFO.
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Normal Behavior: No message will be displayed. The driver will use the specified value to
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configure.
Possible Errors: If the TXFIFO parameter is set to an invalid value, the parameter is ignored and
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the default value is used, and a message indicates a "Parameter value out of range" error.
TXTHRESHOLD
Syntax: TXTHRESHOLD=[0..254 | 0x0..0xFE]
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Example: TXTHRESHOLD=32
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Default: 32, corresponding to 32 * 8=256 bytes
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Normal Behavior: The value will be set in every transmit command. The initial value can only be
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changed at load time, although the driver will increase the value if underruns are detected.
Setting a low value (less than 16) in high bus latency systems could cause excessive TX DMA
underruns, reducing throughput until the driver reacts. Setting a value of more than 200
completely eliminates the possibility of TX DMA underruns.
Possible Errors:
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If the TXTHRESHOLD parameter is set to an invalid value, the parameter is ignored and the
default value is used, and a message indicates a "Parameter value out of range" error.
IFS
Syntax: IFS=[0..255 | 0x0..0xFF]
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Example: IFS=16
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Default: 0 (minimum spacing between frames)
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Normal Behavior: The value will be used to configure the 82557 at initialization time. A value of
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0 implies minimum IFS between 2 transmit frames. Increasing the value reduces the probability of
collisions under heavy load due to multiple clients, but will have a negative impact on transmit
throughput in a point-to-point single-client packet burst.
Possible Errors: If the IFS parameter is set to an invalid value, the parameter is ignored and the
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default value is used, and a message indicates a "Parameter value out of range" error.
RXDMACOUNT
Syntax: RXDMACOUNT=[0..127 | 0x0..0x7F]
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Example: RXDMACOUNT=16
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Default: 0 implying that the Rx DMA will continue until it is done. No other DMA request can
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preempt it.
Adapter configurations 84