[Bug 236962] Realtek RTL8111/8168/8411 erratically drops network connection

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236962

Konstantin Belousov <kib at FreeBSD.org> changed:

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                 CC|                            |kib at FreeBSD.org

--- Comment #6 from Konstantin Belousov <kib at FreeBSD.org> ---
Some time ago I started using
https://www.gigabyte.com/Motherboard/GA-J3455N-D3H-rev-10#ov
for my home server.  In-tree driver stops operating with dreaded 'device
timeout', and the official realtek driver caused some weird hangs of the
whole machine.

I was not able to figure out what is missing in the in-tree driver.  But
for the realtek code, the cause appeared quite silly.  Since chips are
able to do jumbo, but not scatter-gather, they allocated 9K clusters
for rx fill always, even if interface was configured for standard 1500
MTU.  At some time (2-3 weeks for my workload) memory becomes fragmented
enough that driver cannot refill rx, and due to the interface mutex, this
cascaded to everything that touched network.

I added a knob to disable jumbo and re-imported several revisions of the
vendor driver there:
https://github.com/kostikbel/rere

After that I am quite happy running stable/11 for a year without an issue.

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