[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 #25 from Stephen Hurd <shurd at FreeBSD.org> ---
(In reply to Sylvain Galliano from comment #24)

Hrm, could you try putting an ixgbe_qflush(ipf) in ixgbe_stop() before the
interrupt is disabled?  My current theory is that the TX queue is being left in
a bad state (which is why the delay helps).

I don't current have an 11-STABLE system with an ixgbe in it to test on.

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