[Bug 248934] e1000: hw.em.sbp default value change

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248934

            Bug ID: 248934
           Summary: e1000: hw.em.sbp default value change
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: franco at opnsense.org

Created attachment 217546
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217546&action=edit
hw.em.sbp off by default

Hi,

The iflib rewrite changed sysctl hw.em.sbp default to on but it is still
documented as off by default. This coupled with #248869 caused error counters
for the affected NICs to report lots of errors as compared to FreeBSD 11 and
below.

This also affects CURRENT and is present since 12.0, but marking this as a
12.1-RELEASE issue.

Patch is attached to restore the previous behaviour, but maybe the
documentation should be changed instead.


Cheers,
Franco

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