[Bug 240965] gem0 interface unstable under heavy load on Powermac G5 (device timeouts)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240965

            Bug ID: 240965
           Summary: gem0 interface unstable under heavy load on Powermac
                    G5 (device timeouts)
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: cyberlab at gmx.de

The integrated ethernet interface (gem0) on a Powermac G5 becomes unstable
under heavy load. Syslog:

Oct 1 11:18:24 G5 kernel: gem0: device timeout
Oct 1 11:18:24 G5 kernel: gem0: link state changed to DOWN
Oct 1 11:18:26 G5 kernel: gem0: link state changed to UP

The problem has also been reported by other people on the mailing list:

https://lists.freebsd.org/pipermail/freebsd-ppc/2019-May/010585.html

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