Hmmm, thanks for the link :) I'm still very confused though.
Both in his blog and in the patch series initial comment, David mentions duplicating the
qdiscs so that he'd have one per queue rather than one per device. I'm confused about whether
this is supposed to be just an implementation detail to reduce locking somehow, or if this
would be exposed in the traffic shaping user visible interface (in which case I don't
understand how you'd use that :)