[Bug 166724] [re] if_re watchdog timeout

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=166724

--- Comment #35 from Alex Dupre <ale at FreeBSD.org> ---
I don't think I've ever said this issue is good :-)

What I said is that in my environment when I switched to 11.2-RELEASE it was
happening less frequently. With the FreeBSD driver is easy to detect it,
because it prints the timeout message and resets the interface after 5 ticks,
effectively interrupting any connections for a few seconds. The Realtek driver
doesn't reset the interface and doesn't print the message, so a short timeout
might go unnoticed.

To add new info to the thread, recently I've tried to increase the watchdog
timeout of the FreeBSD driver, changing it from 5 to 50 ticks. Well, the result
was that the connection interruption lasted longer, so the interface seems
really stuck and the reset the only solution.

In the last months I've also tried Realtek drivers 1.94.01 and 1.95 (the one
I'm currently running) and I'm not seeing differences from the 1.93, in my
scenario it seems to work good enough (== I'm not able to detect any connection
drop during normal usage, that doesn't mean they are not happening at all).

--- Comment #36 from zjk <zjk7 at wp.pl> ---
Ok, ok Alex - I understand.

Therefore, for doubters - I added 2 posts earlier chart from monitorix.
For a 24/7 server - you can see how the link hangs (and this happens on a
server that has not too heavy load...), only the reset restores a longer good
response.

For problem solvers - I must add: on most computers I use lagg. Evidently this
"overlay" on the driver increases the frequency of hanging (compared to
computers with re without lagg). But this is a separate problem for a separate
thread.

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