If you want security, disable hyper-threading, says Linux kernel maintainer

Didn't one of the main OpenBSD maintainers suggest this like 10-15 years ago?

Unable to find it.

edit : https://en.wikipedia.org/wiki/Hyper-threading#Security

"In May 2005, Colin Percival demonstrated that a malicious thread on a Pentium 4 can use a timing attack to monitor the memory access patterns of another thread with which it shares a cache, allowing the theft of cryptographic information."