Dell Broadcom NetXtreme Family of Adapters User Manual page 160

Using Broadcom Advanced Control Suite 4: Broadcom NetXtreme II Network Adapter User Guide
Tx Enabled. Transmit PAUSE frame is enabled.
IPv4 Checksum Offload
Normally, the checksum function is computed by the protocol stack. When you select one of the Checksum Offload property values
(other than None), the checksum can be computed by the network adapter.
Rx Enabled. Enables receive TCP/IP/UDP checksum offload.
Tx Enabled. Enables transmit TCP/IP/UDP checksum offload.
Tx/Rx Enabled (default). Enables transmit and receive TCP/IP/UDP checksum offload.
None. Disables checksum offload.
IPv4 Large Send Offload
Normally, the TCP segmentation is done by the protocol stack. When you enable the Large Send Offload property, the TCP
segmentation can be done by the network adapter. The default setting for this property is Enabled. This property is only available for
Broadcom NetXtreme II adapters.
IPv6 Checksum Offload
Normally, the checksum function is computed by the protocol stack. When you select one of the Checksum Offload property values
(other than None), the checksum can be computed by the network adapter.
Rx Enabled. Enables receive TCP/IP/UDP checksum offload.
Tx Enabled. Enables transmit TCP/IP/UDP checksum offload.
Tx/Rx Enabled (default). Enables transmit and receive TCP/IP/UDP checksum offload.
None. Disables checksum offload.
IPv6 Large Send Offload
Normally, the TCP segmentation is done by the protocol stack. When you enable the Large Send Offload property, the TCP
segmentation can be done by the network adapter. The default setting for this property is Enabled. This property is only available for
Broadcom NetXtreme II adapters.
Jumbo Packet
Enables the network adapter to transmit and receive oversized Ethernet frames that are greater than 1514 bytes, but less than or
equal to 9000 bytes in length (9600 bytes for network adapters that operate at 10 Gbps). This property requires the presence of a
switch that is able to process jumbo frames. This property is only available for Broadcom NetXtreme II adapters.
Frame size is set at 1500 bytes by default. To increase the size of the received frames, raise the byte quantity in 500-byte
increments.
NOTE: If Jumbo Packet is set to 5000 bytes or greater on network adapters that support 10 Gbps link speed, ensure that Flow
Control is set to Auto to prevent the system performance from performing at less than optimal levels. This limitation exists on a
per-port basis.
LSO & Jumbo Frames
Enables the network adapter to transmit and receive oversized Ethernet frames that are greater than 1514 bytes, but less than 9000
bytes in length. This property requires the presence of a switch that is able to process Jumbo frames. This information is available for
some Broadcom NetXtreme adapters and is not available for all Broadcom NetXtreme II adapters.
Frame size is set at 1500 bytes by default by selecting the LSO Enabled, Jumbo Off option.
NOTE: Jumbo Frames and Large Send Offload (LSO) are mutually-exclusive properties.
Normally, the TCP segmentation is done by the protocol stack. When you enable the Large Send Offload (LSO) property, the TCP
segmentation can be done by the network adapter.
Both Disabled. LSO & Jumbo frames are both disabled.
LSO Enabled, Jumbo Off (default). LSO enabled and jumbo frames disabled.
LSO Off, Jumbo 3000. Frame size of 3000 bytes and LSO off.
LSO Off, Jumbo 4500. Frame size of 4500 bytes and LSO off.
LSO Off, Jumbo 6000. Frame size of 6000 bytes and LSO off.
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