On Fri, Jul 03, 2020 at 05:57:49PM +0200, Uladzislau Rezki wrote: > Hello, folk. > > I have a system based on AMD 3970x CPUs. It has 32 physical cores > and 64 threads. It seems that "nr_cpu_ids" variable is not correctly > set on latest 5.8-rc3 kernel. Please have a look below on dmesg output: > > <snip> > urezki@pc638:~$ sudo dmesg | grep 128 > [ 0.000000] IOAPIC[0]: apic_id 128, version 33, address 0xfec00000, GSI 0-23 > [ 0.000000] smpboot: Allowing 128 CPUs, 64 hotplug CPUs This is your BIOS saying it needs 128 ids, 64 of which are 'empty'. I have a box like that as well, if it bothers you boot with: "possible_cpus=64" or something.
