https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208409
--- Comment #11 from free...@mcwest.org ---
(In reply to ncrogers from comment #10)
Well said. I can confirm that there is a bug in the igb(4) driver when using
the legacy single-queue mode, eventually causing the kernel to crash. Adding a
queue to limit throughput is an effective workaround. For example:
## Limit bandwidth on internal interface to avoid igb driver bug
altq on $int_if cbq bandwidth 404Mb queue { internal }
queue internal bandwidth 99% priority 1 cbq(default red borrow)
Note that this appears to be a bug in the driver, and not in ALTQ itself (and
hence should be a separate bug report). However, with this workaround in place
I have not seen any crashes in the last six months.
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