Three reasons why a stackable peeler doesn't work so well:

- There is some overhead from stacking, due to passing packets up and down
the stack. It also incurs at least one packet of unmanaged buffer.

- A separate qdisc would not have the information about link bandwidth and
active flow count that cake maintains, and uses to influence the peeler.

- Peeling to individual IP packets is strictly necessary when encapsulation
overhead needs to be calculated.

- Jonathan Morton