Check the setting for your RX Int delay. Try setting it to 0. It can be changed on-the-fly via `sysctl hw.em.rx_int_delay`. Look at the comments in if_em.c for an explanation.
If that does not solve the problem, contact Intel support -- they have been very helpful to me in the past.
I'm experiencing a problem with the em driver in 5.1-CURRENT for my Intel 1000/Pro fiber Gbit adapter.
The following is recorded in the syslog:
Oct 15 18:17:49 shaolin kernel: em0: watchdog timeout -- resetting Oct 15 18:30:25 shaolin kernel: em0: watchdog timeout -- resetting Oct 15 18:30:27 shaolin kernel: em0: Link is Down
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