[Bug 206932] Realtek 8111 card stops responding under high load in netmap mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206932

--- Comment #4 from Olivier - interfaSys sàrl <software-freebsd at interfasys.ch> ---
Using fresh netmap from FreeBSD 11 and a newer pkt-gen, this is what I see.

986.519903 [2163] netmap_ioctl              nr_cmd must be 0 not 12
047.486179 [1481] nm_txsync_prologue        fail head < kring->rhead || head >
kring->rtail
047.510386 [1511] nm_txsync_prologue        re0 TX0 kring error: head 107 cur
107 tail 106 rhead 52 rcur 52 rtail 106 hwcur 52 hwtail 106
047.534818 [1612] netmap_ring_reinit        called for re0 TX0
051.945718 [1481] nm_txsync_prologue        fail head < kring->rhead || head >
kring->rtail
051.990215 [1511] nm_txsync_prologue        re0 TX0 kring error: head 225 cur
225 tail 224 rhead 223 rcur 223 rtail 224 hwcur 223 hwtail 224
052.009143 [1612] netmap_ring_reinit        called for re0 TX0

At this point pkt-gen exits with error. 

I've also tried using the netmap software emulation and it crashes even
earlier.

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