Avoiding unintended connection failures with SO_REUSEPORT

Many of us think that we operate busy web servers; LWN's server, for example, sweats hard when keeping up with the comment stream that accompanies any article mentioning the Rust programming language. But some organizations run truly busy servers and have to take some extraordinary measures to keep up with levels of traffic that even language advocates cannot create. The SO_REUSEPORT socket option is one of many features that have been added to the network stack to help these use cases. SO_REUSEPORT suffers from an implementation problem that can cause connections to fail, though. Kuniyuki Iwashima has posted a patch set addressing this problem, but there is some doubt as to whether it takes the right approach.

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