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It adds samples, increasing resolution. There wont be a jitter option for most people. It's way more than a bit of information that's getting added.

https://datatracker.ietf.org/meeting/102/materials/slides-10...

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Sure, the spin bit allows for buffer bloat detection, just like icmp ping does when used actively. Just like stated in the material you share, the best way to mitigate this issue is to remove bufferbloat in the network. There are great easy to configure AQMs nowadays, and servers can do their part by using congestion control algorithms that are less prone to cause excessive buffering e.g Googles BBR.

The issue is being set in stone with the spin bit, bufferbloat or not. It's an always on path signature.

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