Is there a way to know from the command line of a standard LINUX distro (or by installing some tool), whether hyperthreading is enabled in the BIOS of a given machine ?
lscpu shows whether hyper-threading is enabled (or anything similar):
$ lscpu [...] Thread(s) per core: 2 [...]
2 or more in the "Thread(s) per core" line means hyper-threading is enabled.
(You'll also see
ht in the flags in
/proc/cpuinfo, but that only means that the processor supports hyper-threading.)