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Adapter configurations 30
HP NC-Series Broadcom adapter properties
• Flow Control. The Flow Control property allows the user to enable or disable the receipt or
transmission of PAUSE frames. PAUSE frames enable the adapter and the switch to control the
transmit rate. The side that is receiving the PAUSE frame will momentarily stop transmitting. The
recommended selection is Auto and it is the default setting. To disable Flow Control, select Disable
from the Value list on the Advanced tab.
o Auto. (Default) Auto detect flow control
o Disable. PAUSE frame receipt and transmission is disabled
o Tx PAUSE. PAUSE frame transmission is enabled
o Rx PAUSE. PAUSE frame receipt is enabled
o Rx/Tx PAUSE. PAUSE frame receipt and transmission is enabled
• Interrupt moderation. If enabled, helps to reduce number of interrupts per packet, which reduces
CPU utilization, while maintaining the same throughput. This feature is useful under heavy network
traffic conditions.
o Default = Enabled
o Range = Disabled; Enabled
• IPv4 Checksum Offload. Describes whether the device enabled or disabled the calculation of IPv4
checksums.
o Default = Rx/Tx Enabled
o Range = None; Rx Enabled; Tx Enabled; Rx/Tx Enabled
• Large Send Offload Version 1 (IPv4). Describes whether the device enabled or disabled the
segmentation of large TCP packets over IPv4 for large send offload version 1 (LSOv1).
o Default = Enabled
o Range = Disabled; Enabled
• Locally Administered Address. Specifies the user-defined MAC Address of the adapter, which
overrides the burned-in MAC Address. This box is disabled if the selected adapter has been teamed.
o Default = Not Present
o Range = Value; Not Present
• Number of Receive Descriptors: Minimum/Maximum. In high network load situations, increasing
receive descriptors can increase performance. The tradeoff is that this also increases the amount of
system memory used by the driver. If too few receive descriptors are used, performance suffers. If too
many receive descriptors are used, the driver unnecessarily consumes memory resources.
• Number of Transmit Descriptors: Minimum/Maximum. Specifies the number of descriptors to allocate
per Transmit Control Block (TCB). This value directly affects the number of map registers allocated for
the adapter (the higher the number, the more map registers are allocated).
• Priority and VLAN. Enables or disables the ability to insert or remove the 802.1q tags for priority
and VLAN.
o Default = Priority & VLAN Enabled
o Range = Priority & VLAN Disabled; Priority & VLAN Enabled; Priority Enabled; VLAN Enabled
• Speed & Duplex. Allows the user to set the connection speed to the network and mode. The Duplex
Mode allows the adapter to transmit and receive network data simultaneously. The adapter is set to
Auto (optimum connection) by default. Set the speed and mode as described below: