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On the dangers of Intel's frequency scaling

Blog post from Cloudflare

Post Details
Company
Date Published
Author
Vlad Krasnov
Word Count
998
Language
English
Hacker News Points
24
Summary

The performance of the cipher ChaCha20-Poly1305 does not scale well when using Intel's AVX-512 instruction set, which consumes a lot of power and leads to dynamic frequency scaling. This results in reduced CPU frequencies when executing AVX-512 instructions, impacting server performance negatively. While the issue might be resolved with future generations of CPUs, users are advised to disable AVX-512 execution on their servers or desktops if they do not require it for specific high-performance tasks.