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Customizing the Driver Configuration
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MaxJumboFrameSize
MaxJumboFrameSize configures the Jumbo Frame feature of a link. The valid range of
values for this parameter is 0 to 9000. If the value configured is less than 1500, the Jumbo
Frame feature is disabled. Once this is configured, the
ifconfig
command is used to
configure the desired MTU size. The default instant setting is 0:
MaxJumboFrameSize=0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
For example, to configure instance 2 to support a Jumbo Frame of up to 9000 bytes, set
the MaxJumboFrameSize parameter to:
MaxJumboFrameSize=0,0,9000,0,0,0,0,0,0,0,0,0,0,0,0,0;
ifconfig bcme2 mtu 9000
TxPacketDescCnt
TxPacketDescCnt configures the number of Tx packet descriptors. The valid range of
values for this parameter is 32 to 512. More system memory resources will be used for
a larger number of Tx Packet Descriptors. The default value is 100:
TxPacketDescCnt=100;
RxStdDescCnt
RxStdDescCnt configures the number of Rx packet descriptors. The valid range of values
for this parameter is 32 to 512. More system memory resources will be used for a larger
number of Rx Packet descriptors. The default value is 500:
RxStdDescCnt=500;
RxJumboDescCnt
RxJumboDescCnt configures the number of Rx Jumbo packet descriptors. The valid range
of values is 32 to 256. More system memory resources will be used for a larger number of
Rx Jumbo packet descriptors. This parameter is only used if the Jumbo Frame feature is
enabled. The default value is 50:
RxJumboDescCnt=50;
RxCoalescingTicks
RxCoalescingTicks configures the number of Rx Host Coalescing Ticks in microseconds.
This determines the upper boundary of the time interval in which the device will generate
an interrupt if one or more frames are received. The default value is 150:
RxCoalescingTicks=150;
RxMaxCoalescedFrames
RxMaxCoalescedFrames configures the number of Rx Maximum Coalesced Frames
parameters. This determines the maximum number of Rx buffer descriptors that the
device processes before it will generate an interrupt. The default value is 10:
RxMaxCoalescedFrames=10;
TxCoalescingTicks
TxCoalescingTicks configures the number of Tx Host Coalescing Ticks in microseconds.
This determines maximum time interval before the device generates an interrupt if one or
more frames are sent. The default value is 150:
TxCoalescingTicks=150;