[Bug 208205] re0 watchdog timeout

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208205

Chris Hutchinson <portmaster at bsdforge.com> changed:

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                 CC|                            |portmaster at bsdforge.com

--- Comment #33 from Chris Hutchinson <portmaster at bsdforge.com> ---
FWIW we ran into this problem when we opted
to become a public CPAN mirror (perl.org).
Which necessitated adding 2 more ports, and
delegating 2 additional addresses. We used
a 2 port RealTek adapter. About an hour into
going live. The watchdog(8) timeouts began
spamming the logs. The solution was to bump
2 entries in sysctl.conf(5):
kern.ipc.nmbjumbop (245550 by default)
and
kern.ipc.nmbclusters (491100 by default)
as in FreeBSD 11, these numbers are too small --
at least for these NICs.
How high you bump them depends upon the load
and traffic on your NICs. As a rule of thumb
I would suggest bumping them up a quarter of
their original values until watchdog shuts up.
All the while accessing any performance changes.
We're now on 12, and moving to 13 shortly. 12
did NOT exhibit this problem, because the
numbers are much higher by default.

HTH

--Chris

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