[classichasclass]

The implication seems to be that other architectures are also soon to have SMT disabled by default. That would definitely hurt POWER, for example.

[mrpippy]

I think the only other OpenBSD architecture that supports any SMT chips is sparc64 (like the US T1/T2). Unless an actual vulnerability is found, I don't see other OSes following this lead

[temprature]

An "actual vulnerability" has been found. It's amazing that even after the lazy FPU fiasco, people think OpenBSD did this on a complete whim.

[mrpippy]

I stand corrected. From the commit message this seemed much more speculative than the FPU vulnerability (where Theo admitted to being tipped off by someone under the embargo), but clearly it's more than just speculation.

https://www.blackhat.com/us-18/briefings/schedule/#tlbleed-w...

[aade]

Why not? It’s arguably a way to make it slightly safer to run on Intel.

[andreiw]

Also 64-bit Arm...

[joesavage]

As far as I’m aware SMT in Arm cores is pretty uncommon actually.