[Bug 297064] em(4) 82541PI silent TX/RX wedge

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297064

--- Comment #4 from Alexander Leidinger <netchild@FreeBSD.org> ---
Just from reading the patch: it's similar to mine, just that it is automatic
instead of via a loader tunable. So I can tell, that limiting it works
(tomorrow I should have a 72h evidence without any issue, whereas before I had
an issue multiple times a day (workaround: script to down/up, and when that
doesn't help reboot -> a reboot per day on average). Once I cross the 72h line
I have set for myself (in about 12h), I will replace my patch with yours, to
validate the auto detection works.

Note, the iflib watchdog helps (a lot less down/up per day, the watchdog does
it's work, but still the possibility to wedge until reboot)... when it is
fixed. See review D58266 for the fix for the iflib watchdog.

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