[Cake] Running Cake at long RTTs

Loganaden Velvindron loganaden at gmail.com
Tue Oct 27 11:16:54 EDT 2015

On Tue, Oct 27, 2015 at 3:14 PM, Toke Høiland-Jørgensen <toke at toke.dk>

> So Dave and I did a bit of testing of Cake at a 1-second base RTT. That
> showed that, compared with a straight FIFO queue (with a sufficiently
> large buffer), throughput was suffering quite a bit under Cake,
> especially at large bandwidths. We did two changes to fix this:
> - Turn the hard packet queue size into a lower bound rather than an
>   upper bound.
> - Scale the target to be 1/16th of the interval.
> The first change allows Cake to actually reach the target throughput,
> but it still takes a long while to get there. With the second change, we
> actually get the desired behaviour. The attached plot shows the
> difference, with the solid line being before the change and the dashed
> line being after the change.
> Patch attached.
> Fantastic !

I'm going to test it and report back. I'm interested in how this will
perform for 350ms RTT.

> -Toke
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> Cake at lists.bufferbloat.net
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