Dell

Dell PowerEdge R310 Technical Guide 54

11.16 IPv4 and 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.

11.17 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.

11.18 LSO and 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 but is not

available for all Broadcom NetXtreme II adapters.

11.19 Wake-Up Capabilities

Enables the network adapter to wake up from a low-power mode when it receives a network wakeup frame.

Two types of wake-up frames are possible: Magic Packet™ and Wake Up Frame. This property is only

available for Broadcom NetXtreme adapters.

Both (default). Selects both Magic Packet and Wake Up Frame as wake-up frames.

Magic Packet. Selects Magic Packet as the wake-up frame.

None. Selects no wake-up frame.

Wake Up Frame. Selects Wake Up Frame as the wake-up frame and allows the network adapter to wake the

system when an event such as a ping or an Address Resolution Protocol (ARP) request is received. This

option works in conjunction with the operating system power mode saving and does not work if the Power

Save setting does not enable WOL.

11.20 WOL Settings

Sets the speed at which the network adapter connects to the network while the network adapter is in Wake

on LAN mode. By default, the WOL Speed property is set to Auto. This property is only available for

Broadcom NetXtreme adapters.

• 10 Mb. Sets the speed to 10 Mbit/s. This is the network speed when the system is in a standby mode

awaiting a wakeup frame.

• 100 Mb. Sets the speed to 100 Mbit/s.

• Auto (default). Sets the speed for optimum network connection.

11.21 Virtualization Functionality

Broadcom has partnered with various VM vendors, including VMware

, to remove some of the virtualization

bottlenecks and improve system performance by providing additional features. Broadcom Ethernet network

controllers support stateless offloads such as TCP Checksum Offload (CSO), which enables network adapters

to compute TCP checksum on transmit and receive, and TCP Large Send Offload (LSO), which allows TCP

layer to build a TCP message up to 64 KB long and send it in one call down the stack through IP and the

Ethernet device driver, saving the host CPU from having to compute the checksum in a virtual environment.

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