Networking Connectivity
Intel® Server Adapters
Advanced Settings for Intel® PRO/10GbE Server Adapters

The settings listed in the "Advanced" tab enable you to customize how the adapter handles QoS packet tagging, Jumbo Frames, Offloading, and other capabilities.

This page applies only to adapters that have PRO/10GbE in their name. For other 10 gigabit adapters see Advanced Settings for Intel® 10 Gigabit Server Adapters.

Note
  • Some features might not be available depending on the operating system and the specific adapters installed.
  • Advanced tab layout and feature availability is different when Intel PROSet for Windows* Device Manager is installed.
  • On screen help is available when Intel® PROSet for Windows* Device Manager is installed.

Advanced settings
Interrupt moderation allows the adapter to moderate interrupts.

When a packet arrives the adapter generates an interrupt which allows the driver to handle the packet. At greater link speeds, more interrupts are created, and CPU utilization also increases. This results in poor system performance. When you enable Interrupt Moderation, the interrupt rate is lower, and the result is better system performance.
Supported Operating Systems Windows Server 2008*
Default Enabled
Range Disabled, Enabled

Interrupt moderation rate sets the rate at which the controller moderates or delays the generation of interrupts making it possible to optimize network throughput and CPU utilization. The default setting (Adaptive) adjusts the interrupt rates dynamically depending on traffic type and network usage. Choosing a different setting may improve network and system performance in certain configurations. Interrupt Moderation Rate is configured under Performance Options Properties when Intel® PROSet for Windows* Device Manager is installed.

Without interrupt moderation, CPU utilization increases at higher data rates because the system must handle a larger number of interrupts. Interrupt moderation causes the network driver to accumulate interrupts and send a single interrupt rather than a series of interrupts. At higher data rates, a high interrupt moderation setting may improve system performance. At low data rates, a lower interrupt moderation setting is preferred as delayed interrupts causes latency
Supported Operating Systems Windows Server 2008*
Default Adaptive
Range Adaptive, High, Low, Medium, Off

IPv4 checksum offload enables the adapter to verify the TCP/IP checksum on received packets (Rx) and compute checksum on transmitted packets (Tx). IPv4 Checksum Offload is configured under TCP/IP Offloading Options properties when Intel® PROSet for Windows* Device Manager is installed. Enabling this feature may improve TCP/IP performance and reduce CPU utilization. With Offloading disabled, the operating system calculates and verifies the TCP/IP checksum.

Supported Operating Systems Windows Server 2008*
Default Rx & Tx Enabled
Range Disabled, Rx & Tx Enabled, Rx Enabled, Tx Enabled

Jumbo Frames enables or disables Jumbo Frame capability. Jumbo Frames can increase throughput and decrease CPU utilization by putting more data in each frame, thereby sending out fewer frames. The standard Ethernet frame size is 1514 bytes, while Jumbo Frames can contain 4088, 9014, or 16128 bytes. Available settings varies depending on the specific adapter. In Windows* Server 2008 this setting is named Jumbo Packet.

Enable Jumbo Frames only if devices across the network support them and are configured to use the same frame size. When setting up Jumbo Frames on other network devices, be aware that network devices calculate Jumbo Frame sizes differently. Some devices include the header information in the frame size while others do not.
Note Intel adapters do not include header information in the frame size.
Supported Adapters All
Default Disabled
Range

Disabled (1514), 4088, 9014, and 16128 bytes. (Set the switch 4 bytes higher for CRC, plus 4 bytes if using VLANs.)

Note Not all adapters support 16128 byte jumbo frames.

Large send offload (IPv4) and large send offload (IPv6) sets the adapter to offload the task of segmenting TCP messages into valid Ethernet frames. Large Receive Offload is configured under TCP/IP Offloading Options properties when Intel® PROSet for Windows* Device Manager is installed.

Because the adapter hardware is able to complete data segmentation much faster than operating system software, this feature may improve transmission performance. In addition, the adapter uses fewer CPU resources.
Supported Operating Systems Windows Server 2008*
Default Enabled
Range Disabled, Enabled

Locally administered address overrides the virtual, user-assigned MAC address of the adapter. This setting does not override the adapter's physical MAC address. To enter a new network address, type a 12-digit hexadecimal number in this box.

Supported Adapters All
Default None
Range 0000 0000 0001 - FFFF FFFF FFFD
Exceptions:
  • Do not use a multicast address (Least Significant Bit of the high byte = 1).
  • Do not use all zeros or all Fs.
Note Present Setting: Reverts to original network address of the adapter.
Note

In a team, Intel® PROSet uses either:

  • The team's LAA if the team has an LAA configured, or
  • The primary adapter's permanent MAC address if the team does not have an LAA configure
  • Intel PROSet does not use an adapter's LAA if the adapter is the primary adapter in a team and the team has an LAA.

Log link state event enables the logging of the following  link state changes to the system event log.

  • LINK_UP_CHANGE
    Indicates that the adapter has established link.
  • LINK_DOWN_CHANGE
    Indicates that the adapter has lost link.
  • LINK_DUPLEX_MISMATCH
    Indicates a mismatch in duplex between the adapter and the link partner
Troubleshooting Tip: To investigate connection problems, click the Link Speed tab and run diagnostics.

Priority & VLAN enables sending and receiving IEEE 802.3ac tagged frames, which include:

  • 802.1p QoS (Quality of Service) tags for priority-tagged packets
  • 802.1Q tags for VLANs

    When this feature is enabled, tagged packets use the queue settings defined by the operating system's Priority Level Definition. Priority & VLAN is automatically enabled when you set up a VLAN on the VLAN tab. You cannot disable tagging because tagging is required for VLANs.

Note Intel® PROSet for Windows Device Manager and Advanced Networking Services (ANS) must be installed to configure VLANs on Intel® network adapters.
Supported Operating Systems Windows Server 2008*
Default Priority & VLAN Enabled
Range Priority & VLAN Disabled, Priority & VLAN Enabled, Priority Enabled, VLAN Enabled

Receive buffers sets the number of Receive Buffers used by the adapter when copying data to memory. Increasing this value can enhance receive performance, but consumes system memory. Receive Buffers are configured under Performance Options Properties when Intel® PROSet for Windows* Device Manager is installed.

You might choose to increase the number of Receive Buffers if you notice a significant decrease in the performance of received traffic. If receive performance is not an issue, use the default setting.
Supported Operating Systems Windows Server 2008*
Default 256
Range 128, 192, 256, 320, 384, 448, 512

Offload receive IP checksum enables the adapter to verify the IP checksum of incoming packets. This feature enhances reception performance and reduces CPU utilization.

With Offloading disabled, the operating system verifies the IP checksum. With Offloading enabled, the adapter completes the verification for the operating system.
Supported Operating Systems Windows Server 2003*, Server, Windows 2000*
Default The default varies with the operating system.
Range On, Off

Offload receive TCP checksum enables the adapter to verify the TCP or UDP checksum of incoming packets. This feature enhances reception performance and reduces CPU utilization.

With Offloading disabled, the operating system verifies the TCP checksum. With Offloading enabled, the adapter completes the verification for the operating system.
Supported Operating Systems Windows Server 2003, Server, Windows 2000
Default The default varies with the operating system.
Range On, Off

Offload TCP segmentation enables the adapter to offload the task of segmenting TCP messages into valid Ethernet frames.This feature enhances TCP transmit performance and reduces CPU utilization.

With Offloading off, the operating system performs TCP segmentation. With Offloading on, the adapter completes the segmentation for the operating system.
Default The default varies with the operating system.
Range On, Off

Offload transmit IP checksum enables the adapter to compute the IP checksum of outgoing packets. This feature enhances IP transmit performance and reduces CPU utilization.

With Offloading disabled, the operating system verifies the IP checksum. With Offloading enabled, the adapter completes the verification for the operating system.
Supported Operating Systems Windows Server 2003*, Server, Windows 2000*
Default On
Range On, Off

Offload transmit TCP checksum enables the adapter to compute the TCP or UDP checksum of outgoing packets. This feature enhances TCP and UDP transmit performance and reduces CPU utilization.

With Offloading disabled, the operating system verifies the TCP checksum. With Offloading enabled, the adapter completes the verification for the operating system.
Supported Operating Systems Windows Server 2003*, Server, Windows 2000*
Default On
Range On, Off

QoS packet tagging enables the adapter to send and receive IEEE 802.3ac tagged frames, which include 802.1p> QoS and 802.1Q VLAN indications.

Supported Adapters All
Default Disabled
Range Enable, Disabled

Receive descriptors defines the number of Receive Descriptors, which are data segments that enable the adapter to allocate received packets to memory. Depending on the size of the packet, each receive packet requires one or more Receive Descriptors.

You might choose to increase the number of Receive Descriptors if you notice a significant decrease in the performance of received traffic. If receive performance is not an issue, use the default setting appropriate to the adapter. The default setting is 256.

Transmit descriptors defines the number of Transmit Descriptors, which are data segments that enable the adapter to track transmit packets in the system memory. Depending on the size of the packet, each transmit packet requires one or more Transmit Descriptors.

You might choose to increase the number of Transmit Descriptors if you notice a possible problem with transmit performance. Although increasing the number of Transmit Descriptors can enhance transmit performance, Transmit Descriptors do consume system memory. If transmit performance is not an issue, use the default setting of 512.

Related topic:
Jumbo Frames and Jumbo Packets Notes

This applies to:

Intel® PRO/10GbE CX4 Server Adapter
Intel® PRO/10GbE LR Server Adapter
Intel® PRO/10GbE SR Server Adapter



Solution ID: CS-010619
Last Modified: 03-Oct-2014
Date Created: 22-Apr-2004
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