# Cores that don’t count

- **期号**: SRE Weekly Issue #273（2021-06-06）
- **作者**: Peter H. Hochschild, Paul Turner, Jeffrey C. Mogul, Rama Govindaraju, Parthasarathy Ranganathan, David E. Culler, and Amin Vahdat — Google
- **链接**: https://sigops.org/s/conferences/hotos/2021/papers/hotos21-s01-hochschild.pdf

## 简介

This academic paper explains Google’s efforts toward identifying “mercurial” CPU coores — cores that make erroneous computations.

> […] we observe on the order of a few mercurial cores per several thousand machines […]

This one blew my mind:

> A deterministic AES mis-computation, which was “selfinverting”: encrypting and decrypting on the same core yielded the identity function, but decryption elsewhere yielded gibberish.

## 正文

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