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NetXtreme II User Guide
January 2010
Broadcom Corporation
Page 176 Using Broadcom Advanced Control Suite 3 Document ENGSRVT52-CDUM100-R
Flow Control. Enables or disables the receipt or transmission of PAUSE frames. PAUSE frames allow the network adapter
and a switch to control the transmit rate. The side that is receiving the PAUSE frame momentarily stops transmitting. By
enabling TOE, network performance improves, but with the increased performance, TOE performance is more susceptible
to packet loss when flow control is disabled. Enable flow control to reduce the number of packets lost.
NOTE: If Jumbo MTU 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.
• Auto (default). Receive and transmit PAUSE frame functionality are optimized. This option indicates that the adapter
automatically adjusts the flow control settings for optimal performance, and its purpose is not enabling auto negotiation
of the flow control parameters.
• Disable. Receive and transmit PAUSE frame functionality are disabled.
• Rx PAUSE. Receive PAUSE frame is enabled.
• Rx/Tx PAUSE. Receive and transmit PAUSE frame are enabled.
• Tx PAUSE. 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.
Jumbo MTU. 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 MTU 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.
Locally Administered Address. The Locally Administered Address is a user-defined MAC address that is used in place of
the MAC address originally assigned to the network adapter. Every adapter in the network must have its own unique MAC
address. This locally administered address consists of a 12-digit hexadecimal number.
• Value. Assigns a unique node address for the adapter.
• Not Present (default). Uses the factory-assigned node address on the adapter.
The appropriate assigned ranges and exceptions for the locally administered address include the following: