[Bug 200221] em0 watchdog timeout under load

[bugzilla-noreply at freebsd.org]

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

--- Comment #12 from anthony at ury.org.uk ---
Had to make a couple of changes to get that patch into a 10.1-RELEASE kernel:

-- Brought sys/dev/e1000 up to 10-STABLE (as previous)
-- Merged r274043 and r274704 from 10-STABLE

Unfortunately, it hasn't resolved the issue - see below. TSO4 is enabled.

Jul 21 07:36:56 urybsod kernel: em0: Watchdog timeout Queue[0]-- resetting
Jul 21 07:36:56 urybsod kernel: Interface is RUNNING and ACTIVE
Jul 21 07:36:56 urybsod kernel: em0: TX Queue 0 ------
Jul 21 07:36:56 urybsod kernel: em0: hw tdh = 271, hw tdt = 814
Jul 21 07:36:56 urybsod kernel: em0: Tx Queue Status = -2147483648
Jul 21 07:36:56 urybsod kernel: em0: TX descriptors avail = 477
Jul 21 07:36:56 urybsod kernel: em0: Tx Descriptors avail failure = 0
Jul 21 07:36:56 urybsod kernel: em0: RX Queue 0 ------
Jul 21 07:36:56 urybsod kernel: em0: hw rdh = 9, hw rdt = 8
Jul 21 07:36:56 urybsod kernel: em0: RX discarded packets = 0
Jul 21 07:36:56 urybsod kernel: em0: RX Next to Check = 9
Jul 21 07:36:56 urybsod kernel: em0: RX Next to Refresh = 8
Jul 21 07:36:56 urybsod kernel: em0: Link is Down
Jul 21 07:36:56 urybsod kernel: em0: link state changed to DOWN
Jul 21 07:37:00 urybsod kernel: em0: Link is up 1000 Mbps Full Duplex
Jul 21 07:37:00 urybsod kernel: em0: link state changed to UP
Jul 21 07:37:00 urybsod devd: Executing '/etc/rc.d/dhclient quietstart em0'

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