IFQ_SET_MAXLEN usage

[Martin Husemann <martin%duskware.de@localhost>]

Hey folks,

anyone know why we (in general) seem to prefer

	IFQ_SET_MAXLEN(&my_queue, IFQ_MAXLEN);

over the runtime configurable variant:

	IFQ_SET_MAXLEN(&my_queue, ifqmaxlen);

?

I understand that changes to ifqmaxlen will not propagate easily to already
initialized queues, so likely the difference is ... little. But that
makes me wonder why ifqmaxlen is modifiable at all - and the most likely
answer is that I am missing something.

Martin