[Bug 243463] ix0: Watchdog timeout

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243463

--- Comment #8 from Jiri <silence at cnw.cz> ---
Some new information.
Kernel patched to P3. May be not problem in Intel driver.
I change Intel NIC to Mellanox ConnectX4 NIC to wish solve traffic outages.
There is running cron script to test connectivity to gateway an down/up
interface. 

Log attached:
Fri Apr 10 19:57:13 CEST 2020 interface ix0 restart
Fri Apr 10 20:38:13 CEST 2020 interface ix0 restart
Sat Apr 11 17:45:13 CEST 2020 interface ix0 restart
Sat Apr 11 20:00:13 CEST 2020 interface ix0 restart
Sat Apr 11 20:30:13 CEST 2020 interface ix0 restart
Sun Apr 12 19:16:13 CEST 2020 interface ix0 restart
Sun Apr 12 20:30:13 CEST 2020 interface ix0 restart
Sun Apr 26 00:27:13 CEST 2020 interface mce0 restart
Sun Apr 26 04:48:13 CEST 2020 interface mce0 restart
Sun Apr 26 11:12:13 CEST 2020 interface mce0 restart
Wed Apr 29 21:27:13 CEST 2020 interface mce0 restart
Wed Apr 29 21:33:13 CEST 2020 interface mce0 restart

After changing network card from Apr 12 to Apr 26 no problems appears. But from
Apr 26 on the Mellanox card traffic not stop, but 80% packet loss appear.
Interface down/up solve this issue, like in Intel case.
Other servers in my network have connectivity to gateway O.K., there is no
connectivity/switch issues.
Traffic max about 1,3GBit/s on the NIC.
On Mellanox NIC this log event appear "arpresolve: can't allocate llinfo for
xxx.xxx.xxx.xxx on mce0"

Jiri

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