[$] Avoiding unintended connection failures with SO_REUSEPORT

Many of us think that we operate busy web servers; LWN's server, forexample, sweats hard when keeping up with the comment stream thataccompanies any article mentioning the Rust programming language. But someorganizations run truly busy servers and have to take someextraordinary measures to keep up with levels of traffic that even languageadvocates cannot create. The SO_REUSEPORT socket option is one ofmany features that have been added to the network stack to help these usecases. SO_REUSEPORT suffers from an implementation problem that cancause connections to fail, though. Kuniyuki Iwashima has posted a patchset addressing this problem, but there is some doubt as to whether ittakes the right approach.