That might explain things, although it shouldn't have worked before
either.
CBQ creates default pfifo qdiscs for its leaves, these use a limit
of txqueuelen or 1 if it is zero. So even small bursts will cause
drops. Do things improve if you set txqueuelen to a larger value
*before* configuring the qdiscs?
Another thing is that CBQ on bond will probably not work properly
at all, it needs a real device since it measures the timing between
dequeue events for idle time estimation. On software devices this
doesn't work.
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