[Bug 200221] em0 watchdog timeout under load

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200221

--- Comment #10 from anthony at ury.org.uk ---
Now using sys/dev/e1000 at 283959 from 10-STABLE (rest of the kernel 10.1-RELEASE
as before), I'm seeing watchdog timeouts again, with tso4 enabled. Again, this
only seems to happen at a point of high network load (nightly backup over NFS).
I'll try disabling tso4 on this revision but failing that, will go back to
e1000 at 269196.

There is slightly more detail in messages now, though: 

Jul  8 07:31:58 urybsod kernel: em0: Watchdog timeout Queue[0]-- resetting
Jul  8 07:31:58 urybsod kernel: Interface is RUNNING and ACTIVE
Jul  8 07:31:58 urybsod kernel: em0: TX Queue 0 ------
Jul  8 07:31:58 urybsod kernel: em0: hw tdh = 909, hw tdt = 1015
Jul  8 07:31:58 urybsod kernel: em0: Tx Queue Status = -2147483648
Jul  8 07:31:58 urybsod kernel: em0: TX descriptors avail = 914
Jul  8 07:31:58 urybsod kernel: em0: Tx Descriptors avail failure = 114
Jul  8 07:31:58 urybsod kernel: em0: RX Queue 0 ------
Jul  8 07:31:58 urybsod kernel: em0: hw rdh = 959, hw rdt = 958
Jul  8 07:31:58 urybsod kernel: em0: RX discarded packets = 0
Jul  8 07:31:58 urybsod kernel: em0: RX Next to Check = 959
Jul  8 07:31:58 urybsod kernel: em0: RX Next to Refresh = 958
Jul  8 07:31:58 urybsod kernel: em0: Link is Down
Jul  8 07:31:58 urybsod kernel: em0: link state changed to DOWN
Jul  8 07:32:01 urybsod kernel: em0: Link is up 1000 Mbps Full Duplex
Jul  8 07:32:01 urybsod kernel: em0: link state changed to UP
Jul  8 07:32:01 urybsod devd: Executing '/etc/rc.d/dhclient quietstart em0'

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