On the dangers of Intel's frequency scaling
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.
Company
Cloudflare
Date published
Nov. 10, 2017
Author(s)
Vlad Krasnov
Word count
998
Language
English
Hacker News points
24