[Bug 207261] NETMAP don't do TX sync with kqueue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207261

--- Comment #6 from slw at zxy.spb.ru ---
(In reply to Vincenzo Maffione from comment #5)

Do you have any progress on this?

My guess:

1. on kevent() no changes for netmap FD (associated w/ TX ring)
2. no events (nor RX and nor TX) in kernel for this FD (associated w/ TX ring)

 => no netmap_knread() call for this FD and no chance for txsync in
netmap_poll().

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