[Bug 208409] [PATCH] igb and ALTQ

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208409

--- Comment #11 from freebsd at 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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