Ipv4 And Ipv6 Large Send Offload; Jumbo Mtu; Lso And Jumbo Frames; Wake-Up Capabilities - Dell PowerEdge R310 Technical Manual

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IPv4 and IPv6 Large Send Offload

11.16
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.

Jumbo MTU

11.17
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.

LSO and Jumbo Frames

11.18
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
available for all Broadcom NetXtreme II adapters.

Wake-Up Capabilities

11.19
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.

WOL Settings

11.20
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.

Virtualization Functionality

11.21
Broadcom has partnered with various VM vendors, including VMware
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.
Dell PowerEdge R310 Technical Guide
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NetXtreme adapters but is not
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, to remove some of the virtualization
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