[Bug 221317] Netmap issue after ixgbe driver update in r320897

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221317

--- Comment #17 from Sylvain Galliano <sg at efficientip.com> ---
(In reply to Cassiano Peixoto from comment #15)

Hello Cassiano,

can you try to recompile kernel using attached patch.
It add a 1s delay before stopping ixgbe interface (i.e. ifconfig down or netmap
initialisation)
I know it's a TERRIBLE patch but I had no issue after stressing my servers.
If it's also work for you, I hope this can help driver maintainer to find and
correct the issue.

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