The "More Accurate Explicit Congestion Notification" (AccECN) mechanism is defined by this
RFC draft. The Linux kernel has been gaining support for AccECN with
TCP over the last few releases; the 7.0 release will enable it by default
for general use. AccECN is a subtle change to how TCP works, but it has
the potential to improve how traffic flows over both public and private networks.
https://lwn.net/Articles/1058666/
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