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x/crypto/chacha20poly1305: linux/arm64 Go 1.9 performance is 3X slower than OpenSSL #22809
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referenced this issue
Nov 19, 2017
Substantial perf improvements on Cavium ThunderX going from go 1.10.2 to go1.11beta1, but not 3x faster.
"If you prioritize arm64 chacha and arm64 poly, it will see production use super soon after."
It appears from comments on that patch that the coding work has largely been done but there are constraints on the availability of reviewers for arm64 assembly.