QUIC should interact with cake in the same way as with fq_codel. Since QUIC aims to minimise the standing queue by itself, it should usually be seen as a "sparse" flow which cake will automatically prioritise and avoid dropping packets from. That, of course, is what you want in a streaming protocol.
If QUIC does persistently exceed the fair share bandwidth, it'll get signalled using ECN (if marked capable) or packet drops at a linearly increasing frequency, just like any other protocol. I haven't studied QUIC enough to be sure about how it reacts to that, but cake is not really different to any other AQM in that respect. I do know that QUIC can cover a small amount of packet loss at the receiver. - Jonathan Morton
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