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Re:Linux Kernel RNG is now Blake2 instead of SHA1 and 3x faster by Kubuxu on Thursday December 30, 2021 @09:39PM (#29744266)
Blake3 is still quite new (although it is a tested core) so I would say they made the right call.

It would only result in small incremental perf improvement due to reduced number of rounds (10 to 7).

Majority of Blake3's perf benefit manifests from merkle-tree structure and SIMD processing of multiple input streams at the same time.

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