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Fallback is also a setting [LWN.net]
draco · 2026-06-14 · via LWN.net comments

Fallback is also a setting

Posted Jun 14, 2026 13:36 UTC (Sun) by draco (subscriber, #1792)
Parent article: More accurate congestion notification for TCP

From the article:
> Some highly scientific "screw around on the net for a while" tests conducted here suggest that, 25 years or so after its inception, classic ECN is safe to enable for outgoing connections.

With or without tcp_ecn_fallback on? It doesn't change your conclusion, but it does change what it means.

Linux documentation:
> tcp_ecn_fallback - BOOLEAN
> If the kernel detects that ECN connection misbehaves, enable fall back to non-ECN.