Ideally, one would read the raw sync rate out of the modem (there has to be a way to do that, since it is able to report it in the web interface), and use that to set cake's bandwidth parameter. You could update it periodically using "tc qdisc change ...".
You will need to set the overhead calculation correctly, probably using "pppoa-vcmux" or similar, depending on precisely what encapsulation your ISP uses. If you're not confident about that, specify "conservative" to begin with. Once you have that, you can experiment to see how much you need to reduce the raw sync rate to achieve full bottleneck control - hopefully not much, at most 1%. The same approach would also work for inbound if necessary, except that you would need to reduce the raw sync rate rather more. - Jonathan Morton
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