[Bug 280386] if_bridge throws output errors under load

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280386

--- Comment #23 from pascal.guitierrez@gmail.com ---
(In reply to Kevin Bowling from comment #21)
(In reply to Kevin Bowling from comment #22)

Interesting, thanks for that.

I tried changing dev.igb.0.iflib.override_ntxqs=4096 but to no effect.

What did make a difference was to use the rack tcp stack
net.inet.tcp.functions_default=rack

using rack there was next to no packet loss when interrupts were scheduled onto
a single core, obviously not fixing the root cause but is somewhat of a
workaround.

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