[Cake] cake review comments cake_drop

[Jonathan Morton]

I remember changing cake_drop so that it iterated over the list of active
flows rather than the whole potential array. Hence an inactive class, which
has no active queues, costs nothing to iterate over.  Usually the total
number of active queues is tolerably small.

Conversely I don't precisely remember the sequence of events for reducing
the class count, so this change might well break it.

- Jonathan Morton
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