[Bug 231166] 11.1->11.2 Update brings em network link state flapping

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231166

--- Comment #2 from Compri <tomek at compri.pl> ---
from intel manual, try this:

Important system configuration changes:
  ---------------------------------------

  When there is a choice run on a 64bit OS rather than 32, it makes a 
  significant difference in improvement.

  The interface can generate high number of interrupts. To avoid running 
  into the limit set by the kernel, adjust hw.intr_storm_threshold 
  setting using sysctl:

       sysctl hw.intr_storm_threshold=9000 (the default is 1000)

  For this change to take effect on boot, edit /etc/sysctl.conf and add the 
  line:  
       hw.intr_storm_threshold=9000

  If you still see Interrupt Storm detected messages, increase the limit to a
  higher number.

  Best throughput results are seen with a large MTU; use 9000 if possible.

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