[Cake] documentation review request and out of tree cake builds for openwrt/etc.

[Jonathan Morton]

I'm not concerned about aggregation effects on cable, because it's not
station specific as it is on Wi-Fi. It might be a source of one extra
access grant delay at most; after that there'll be enough packets in the
modem's FIFO to justify a full sized grant. Here the modem's buffer really
does exist for a good reason, and we can rely on it to do the job.

I'm also not concerned about ack bunching, because realistically that isn't
really caused by FQ. Given a 10:1 bandwidth ratio, and a 3:1 delayed ack
factor, there'll be 3.33 acks for each data packet in the slow direction,
while at our default 300 quantum the DRR will cycle five times per data
packet. So acks for a given flow will only be delivered bunched if they
arrived bunched.

- Jonathan Morton
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