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

[bugzilla-noreply at freebsd.org]

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

--- Comment #2 from Olivier - interfaSys sàrl <software-freebsd at interfasys.ch> ---
Setting re0 to use a MTU of 9000 and the connection stays alive. Instead of
timing out, the packet rate drops drastically once and things go back to
normal. 
The main difference in netstat is that the mbuf clusters are split between
standard and jumbo frames

```
768/2787/3555 mbufs in use (current/cache/total)
256/1524/1780/500200 mbuf clusters in use (current/cache/total/max)
256/1515 mbuf+clusters out of packet secondary zone in use (current/cache)
0/46/46/250099 4k (page size) jumbo clusters in use (current/cache/total/max)
256/65/321/74103 9k jumbo clusters in use (current/cache/total/max)
0/0/0/41683 16k jumbo clusters in use (current/cache/total/max)
3008K/4513K/7521K bytes allocated to network (current/cache/total)
0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters delayed (4k/9k/16k)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
0 requests for sfbufs denied
0 requests for sfbufs delayed
0 requests for I/O initiated by sendfile
```

The rate in vmstat keeps rising, but that doesn't seem to be a problem

```
interrupt                          total       rate
irq16: sdhci_pci0                      1          0
cpu0:timer                       3008083       1113
irq256: ahci0                      10125          3
irq257: xhci0                      11363          4
irq258: hdac0                          3          0
irq259: re0                     13105929       4850
irq260: re1                       101440         37
cpu2:timer                       1095578        405
cpu1:timer                       1083354        400
cpu3:timer                       1123144        415
Total                           19539020       7231
```

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