[Bug 239240] igb: TX(2) desc avail = 1024, pidx = 0 messages appear when the network card (igb/ixgbe/em) loses ethernet link

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239240

--- Comment #22 from 76nemo76 at gmx.ch ---
After further tests, I think the problems I still had are no more 
related to the fact that the network card is unplugged.

If I plug it again in the same port, the network is  working
correctly. It should be a problem with the management of the bridge by FreeBSD.
If I plug the cable on an other port, the network is down.

By the way, I have installed the new world (for my former tests I have
installed only the new kernel), but I am almost certain that this is not the
reason of this better behaviour.

To be complete, I have still to test the disconnection for a very long peiod.
In my previous tests, the problem was less serious after a break of some
minutes but it becomes more serious after few hours.

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