I've also seen no ill effects making changes on the fly. I've also gone to using "besteffort" based on that video, set my speeds to the ones Verizon guarantees me as they provide headway and then beat up my like. 4 - 4K videos on my computer, as well as speed test, and a constant ping to 220.127.116.11. Also a VOIP call, and my son streaming video on his computer. I expected to run out of bandwidth on my 100-Mb symmetric link yet the only sign of a load was the slower than usual speed test. I'm done configuring, it just works.I'd missed this originally, and tested today - it does indeed seem to still prioritise some traffic but on my download it's very minimal anyway. I added 'wash' to upload and it still assigned traffic to the Voice and Video tins. Thanks
No, no factory reset as it shouldn't be needed but I have been withdrawing consent from the privacy page after turning everything off.
I think I was doing something to cause it. Maybe it was because I was leaving my SSH session running the cake-qos script so I could easily check if it was running and look at my diffserv4 tin stats, but this was stopping it restarting cake when needed?
The video posted by @Morris states that cake can be reconfigured on the fly without any packet loss. I've certainly seen no ill effects.