In order to see network driver link messages on your console, set dmesg to eight by entering the following:. Now I have two new gigabit NICs on the way and may not need them after all. MSI-X is required for multiple queue support, and some kernels and combinations of kernel. If the driver load fails to enable a specific interrupt mode, the driver will try other interrupt modes, from least to most compatible. You can enable it on an em interface using ifconfig 8. In this mode, which operates the same as mode 3, the InterruptThrottleRate will be increased stepwise to for traffic in class “Lowest latency”.
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Instead, use the Speed and Duplex parameters previously ibtel to force the adapter to the same speed and duplex. Dynamic interrupt throttling is only applicable to adapters operating in MSI or Legacy interrupt mode, using a single receive queue.
Increasing this value allows the driver to queue more transmits. I’ve never had this many issues with an Intel based NIC.
Interrupt moderation must be used to avoid interrupt storms while the driver is processing one interrupt. This parameter is a bit mask that specifies which speed and duplex settings the board advertises.
Ubuntu Manpage: em — Intel(R) PRO/ Gigabit Ethernet adapter driver
After determining the type of incoming traffic in the last timeframe, it will adjust the InterruptThrottleRate to an appropriate value for that traffic. Intel is not supplying patches against the kernel source to allow for static linking of the driver.
Once the class is determined, the InterruptThrottleRate value is adjusted to suit that traffic type llnux best. There are other conditions which may result in “TX Timeout”, which will not be resolved by the use of the TxDescriptorStep parameter. That was causing the issue with pings not working when eth1 was up. The default value is 0, since adapters may hang with this feature being enabled.
In order to disable receive flow control using ethtool, you must turn off auto-negotiation on the same 82541bi line.
Downloads for Intel® 82541GI Gigabit Ethernet Controller
The default behaviour 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.
This parameter is supported only onand later adapters. This may increase network latency but also increases the chances that the system will enter a lower power state. For more information about the InterruptThrottleRate parameter, see the application note at: NAPI is enabled or disabled based on the configuration of the kernel. If you believe your system needs to disable this style of interrupt, the driver can be built and installed with the command: As this value decreases one may want to consider increasing the TxDescriptors value to maintain the same amount of frame memory.
In dynamic conservative mode, the InterruptThrottleRate value is set to for traffic that falls in class “Bulk traffic”. On bootup I noticed that it will not initialize this NIC but I am able to manually insert the e module and bring it up.
If the bytes per second rate is approximately equal, the interrupt rate will drop as low as interrupts per second. You can enable it on an em interface using ifconfig 8. This driver supports multiqueue in kernel versions 2. Ports 1 and 2 don’t show any errors and will pass traffic. The value at offset 0xe de has bit 0 unset.
Increasing this value allows the driver to buffer more incoming packets, at the expense of increased system memory utilization. When I reboot it’s gone again.
Channel Bonding documentation can be found in the Linux kernel source: Load the module using either the insmod or ingel command: Refer to the Speed and Duplex section of this readme for more information on the AutoNeg parameter. It just seems after every reboot that it doesn’t want to come up automatically.
Default 1 dis- abled.
CONFIG_E1000: Intel(R) PRO/1000 Gigabit Ethernet support
Receive interrupt reduction can improve CPU efficiency if properly tuned for specific network traffic. However, the frequency and random intervals at which packets arrive do not allow the system to enter a lower power state.
MSI-X is required for multiple queue support, and some kernels and combinations of kernel.