R620 duel xeon e5-2680 v2

Does Ipfire limit the system to only use one processor? or is it that the smt is disabled and that’s why Htop shows 20 threads as offline

I believe SMT is disabled because of Meltdown & Spectre. See these two blogs and one Wiki page:

Meltdown and Spectre is not the reason for disabling smt but if the cpu is affected for Foreshadow or Fallout/ZombieLoad/RIDL IPFire disable SMT if you not force it (which is a bad idea)



thanks for the input