On 11 Aug 2020, at 01:17, Almudena Garcia <liberamenso10...@gmail.com> wrote: > > > That being said, instead of hardcoding the maximum number of CPUs to > > be 256, you can just let the user choose whatever value is preferred. > > That's what Linux does. > > But this could cause coherency problems.
Coherency is a very specific thing in operating systems about the properties of the underlying memory subsystem. It's not the word you're looking for. > By example, if the user sets mach_ncpus=4 , and the processor has 8 cores, It > can produce an out-of-index error in the access to the arrays which store the > info about the cpus. So don't bring them online then? The user asked for 4 CPUs, so bring up 3 APs alongside the BSP and that's that. Jess
