Hi all,
Before addressing my question, below is my system configuration:
MB: SUPERMICRO X10SBA
Lan chip: Intel® i210AT dual port GbE LAN - two lan ports available on the
board
OS: Ubuntu 16.04
As far as I know, the network naming mechanism has been changed since
Ubuntu 15.10 and its newer version, udev will follow the rule to assign the
network interface name:
* Predictable network interface device names based on:
* - firmware/bios-provided index numbers for on-board devices
By using udevadm to get more information about these two lan ports ( detail
log can be found in the attachment ):
1. Two lan chips report the same index
* ATTRS{index}=="1"*
2. Based on the udev, one network interface is named eno1 <---- the number
"1" is because of reporting from index
However, the other one is incorrect, it's interface name is "rename3"
3. The system boots very slow due to the race condition of network naming (
eno1 is taken and the other one keeps trying to get this and then finally
gave up )
4. I revert back to the original network interface naming rule ( eth0,
eth1... ), the system boots as fast as I expect.
Question:
1. My understanding is that the index value should be unique. Since the
board has two lan ports, the index value should not be the same. If i am
wrong, please correct me.
2. I traced udev and igb. The value reported by udevadm is obtained from
*/sys/class/net/xxx*. I assume the information in */sys/class/net/xxx *is
reported from igb driver.
3. Hence, where is *ATTRS{index}=="1" *reported from, should it be Lan
chip firmware or bios ?
Any discussion is appreciated.
Thanks
Paul
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