OpenBSD will disable all but the first thread on any Intel processor by default. I'm assuming that an Intel i5-3320M (2 cores 4 threads) is too old to have microcode updates addressing the Spectre exploits (Meltdown, Foreshadow, Fallout, Zombieload, RIDL etc.), and disabling SMT/HT might be the most secure thing to do by default.
This script produces a good assessment of Spectre problems for a wide variety of CPUs. I know that they are difficult to exploit, and the mitigations are disabled by many because of their performance impact.
This script produces a good assessment of Spectre problems for a wide variety of CPUs. I know that they are difficult to exploit, and the mitigations are disabled by many because of their performance impact.
https://github.com/speed47/spectre-meltdown-checker