[Bug 250436] Regression in 12.stable em driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250436

            Bug ID: 250436
           Summary: Regression in 12.stable em driver
           Product: Base System
           Version: 12.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: chrysalis at chrysalisnet.org

Created attachment 218861
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218861&action=edit
smokeping data

Hi

I upgraded a server using the em driver from 11-STABLE to 12-STABLE 2 days ago.

I had previously tried EM_MULTIQUEUE but it behaved badly so was operating on
single queue.

Since the update I am getting latency spikes, confirmed even on LAN.  I have
smokeping graphs which show this if required, it was initially noticed by
myself with lag in the ssh session which seems to come on for a couple of
seconds and then disappears, but affects all traffic.

I observed that in 12-STABLE multiqueue now seems to be enforced, on other
drivers such as igb there is a boot time tunable.

Is there a way to toggle multiqueue, or something else I can try to fix it,
otherwise I am posting here a problem report.

I did also find this PR but has been closed.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234570

Chris

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