Hoping someone can help.
Recently upgraded a server running Xen from 3.18.44-20.el6.x86_64 to 4.9.39-29.el6.x86_64 (did a yum update so other packages would have been updated to).
Since rebooting, we randomly get "e1000e: eth0 NIC Link is Down", this happens for only a second, but since we have this interface bonded it can be enough for it to bring down the interface fail over, and then come back again, which causes packet loss.
If tried turning pcie_aspm off, flow control off, nothing seems to help. The problem seems to be worse when high traffic is being used, but also happens randomly as well.
NIC Intel Corporation 82574L Gigabit on a Supermicro box. Driver 3.2.6-k
Have now upgraded to 220.127.116.11, the problem seems to be happening a lot less often, but I'm not sure if its a coincidence.
Thank you for posting at Wired Communities. What is the exact model of your Supermicro box? Where did you download the driver version 3.2.6-K and 18.104.22.168?
As this is an onboard NIC, have you contacting the Supermicro support for the driver? Please feel free to update me.
As stated in my initial message, we ran yum update which updated the kernel as well as other packages (which in turn also provided a new version of the driver from centos than we were using previously)
Supermicro have just requested further information on there replies but that is all. Upon further research I found some mentions of using IntMode=1,1 I set this in modprobe.d and restarted the network, it has since been stable.