As the issue addressed by this parameter has never been observed on Intel Architecture platforms, it should not be used on Intel platforms. Several adapters with the chipset display “TX unit hang” messages during normal operation with the ee driver. When a spoofed packet is detected the PF driver will send the following message to the system log displayed by the “dmesg” command:. If during this process you are asked for the driver or module name, the name for the Linux Base Driver for the Gigabit Family of Adapters is igbvf. Transmit interrupt reduction can improve CPU efficiency if properly tuned for specific network traffic.

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Degradation in throughput performance may be observed in some Jumbo frames environments. The Linux base drivers support the 2. Some Intel gigabit adapters that support Jumbo Frames have a frame size limit of bytes, with a corresponding MTU size limit of bytes.

Do not use MSI-X with the 2. NAPI is enabled or disabled based on the configuration of the kernel.

If the system is reporting dropped transmits, this value may be set too high causing the driver to run out of available transmit descriptors.

Internal stress testing with jumbo frames shows the reliability on some and devices is improved in certain corner cases by disabling the Early Receive feature. The user can turn off this parameter in supported chipsets.

# – Intel Ethernet adapters (igb and igbvf drivers) – Debian Bug report logs

For other Linux distributions, download and install ethtool from the following website: Proper tuning, along with RxIntDelay, may improve traffic throughput in specific network conditions. Turning on DMA Coalescing may save energy with kernel 2.


Use the ifconfig command to increase the MTU size. If you have multiple interfaces in a server, either turn on ARP filtering by entering:. There is a known issue using Jumbo frames liux connected to a Foundry BigIron switch. Intel is not supplying patches against the kernel source to allow for static linking of the driver.

Multiqueue In this mode, a separate MSI-X vector is allocated for each queue and one for “other” interrupts such as link status change and errors.

The range of to interrupts per second works on a majority of systems and is a good starting point, but the optimal value will be platform-specific.

When e is loaded with default settings and multiple adapters are in use simultaneously, the CPU utilization may increase non-linearly. Otherwise the driver can be loaded once and will be safe, but unloading it will lead to the issue. LLIPush can be set to be enabled or disabled default.

Instructions on updating ethtool can be found in the section Additional Configurations later in this document. After installing the driver, if your Intel Ethernet Network Connection is not working, verify that you have installed the correct driver.

This parameter is different than other parameters, in that it is a single not 1,1,1 etc.

This value represents the size-order of each transmit descriptor. If both Duplex and the link partner are set to auto-negotiate, the board auto-detects the correct duplex.


In this case, use a lower number. This value delays the generation of transmit interrupts in units of 1. If the system is reporting dropped receives, this value may be set too high, causing the driver to run out of available receive descriptors. jgbvf

Linux Kernel Driver DataBase: CONFIG_IGBVF: Intel(R) Virtual Function Ethernet support

The following adapters limit Jumbo Frames sized packets to a maximum of bytes: Can be either one or two-directional. There is a known hardware compatibility issue on some systems with RHEL3 kernels. The igbvf driver supports based virtual function devices that can only be activated on kernels that support SR-IOV. In order to limit the CPU utilization without impacting the overall throughput, we recommend that you load the driver as follows: This can be an issue on Linux distributions that timeout when checking for link prior to acquiring igbvv DHCP address; however there is usually a way to work around this e.

Linux* Base Drivers for IntelĀ® Ethernet Network Connection

If you are required to use a 2. WoL will be enabled on the system during the next shut down or reboot. Enables or disables DMA Coalescing feature.