This value specifies the number of receive buffer descriptors allocated by the driver. Setting TxDescriptorStep to a value of 4 will ensure that all TX descriptors are aligned to the start of a system memory cache line, and so this problem will not occur. If the bytes per second rate is approximately equal, the interrupt rate will drop as low as interrupts per second. With some Phy and switch combinations, link can take longer than expected. Link messages will not be displayed to the console if the distribution is restricting system messages.

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Instead, use the Speed and Duplex parameters previously mentioned to force the adapter to the liunx speed and duplex.

In addition the number of queues available for RSS is limited if this is set to 1 or greater. There is a known hardware compatibility issue on some systems with RHEL3 kernels. This value is the number of transmit descriptors allocated by the driver. Useful only if TxIntDelay is non-zero, this value ensures that an interrupt is lknux after the initial packet is sent on the wire within the set amount of time.

Linux source code: drivers/net/ethernet/intel/igb/igb_main.c (v) – Bootlin

Lgb user can turn off this parameter in supported chipsets. The driver can limit the amount of interrupts per second that the adapter will generate for incoming packets. This parameter is supported only onand later adapters. This parameter is also affected by the VMDq parameter in that it will limit the queues more. If you have just recompiled the kernel reboot the system now.


If you currently have the e driver installed and need to install ee, perform the following:. In this mode, which operates the same as mode 3, the InterruptThrottleRate will be increased stepwise to for traffic in class “Lowest latency”.

In dynamic conservative mode, the InterruptThrottleRate value is set to for traffic that falls in class “Bulk traffic”. First identify your adapter.

There are other conditions which may result in “TX Timeout”, which will not be resolved by the use of the TxDescriptorStep parameter.

This issue is fixed in linus version 2. To eliminate the potential for the hang ensure that RxIntDelay is set to zero. The parameter may be specified as either a decimal or hexadecimal value as determined by the bitmap below.

FreeBSD Manual Pages

Turning on DMA Coalescing may save energy with kernel 2. These drivers are only supported as a loadable module. It should be used when you wish to control which speed and duplex combinations are advertised during the auto-negotiation process. Then select the name of the specified base driver: Auto-negotiation is disabled, and the AutoNeg parameter is ignored.

If you have a machine with a BMC enabled kgb cannot receive IPMI traffic after loading or enabling the driver, try disabling this feature. This value specifies the number of receive buffer descriptors allocated by the driver. If CPU utilization is not a concern, use default driver settings.


For other Linux distributions, download and install ethtool from the following website: When setting RxIntDelay to a value other than 0, adapters may hang stop transmitting under certain network conditions.

Restarting the system appears to be the linuc remedy. If the system is reporting dropped transmits, this value may be set too high causing the driver to run out of available transmit descriptors. All interrupts are throttled via interrupt moderation.

The install location listed above is the default location.

DMA Coalescing is effective in helping potentially saving the platform power only when it is enabled across all active ports. Proper tuning, along with RxIntDelay, may improve traffic throughput in specific network conditions.

The default behavior of the driver previously assumed a static InterruptThrottleRate value ofproviding a good fallback value for all traffic types, but lacking in small packet performance and latency. 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.