> 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. It's not a bad idea. Then I will fix my cpu enumeration loop to add this new condition.
El mar., 11 ago. 2020 a las 2:23, Jessica Clarke (<jrt...@jrtc27.com>) escribió: > 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 > >
