nexus/sreweekly/markdown/273/02-cores-that-don-t-count.md

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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