Indeed, the OpenBSD guys said early on that hyperthreading should just be disabled for security reasons. It took everyone else to catch up, but see Greg KH's c

Indeed, the OpenBSD guys said early on that hyperthreading should just be disabled for security reasons. It took everyone else to catch up, but see Greg KH's comments that if users are untrusted, one should do so: https://www.youtube.com/watch?v=jI3YE3Jlgw8 https://www.youtube.com/watch?v=jI3YE3Jlgw8