Hi Alexei and Daniel, I got feedback from Fusion bios/chipset team. In short, the value 'possible' includes empty CPU socket. To verify, I tested on a physical Xeon machine with 2 CPU sockets, one of them is empty. I got 'possible' = 0-239, the number of 'cpu*' =12. As a result, extra bytes are copied from kernel to userspace.
As for Fusion, there is a configuration in *.vmx. If we disable cpu hot plug by "vcpu.hotadd=FALSE", then 'possible' == the number of 'cpu*' dirs, which is the configuration in ESX. If "vcpu.hotadd=TURE", then 'possible' is larger than 'cpu*' dirs, allowing users to add more vcpus. Regards, William On Fri, Aug 12, 2016 at 4:08 PM, Alexei Starovoitov <alexei.starovoi...@gmail.com> wrote: > On Fri, Aug 12, 2016 at 09:58:51AM -0700, William Tu wrote: >> Hi, >> >> I've tested on ESXi version 5.5 and it seems OK. >> - VM1: Ubuntu 14.04, kernel 3.19 ---> OK 3 cpu dirs, possible = 0-2 >> - VM2: Centos7, kernel 3.10 ---> OK 8 cpu dirs, possible = 0-7 >> >> I tried another MacBook with Fusion, same issue happens, the cpu[0-9] >> dirs are not equal to /sys/devices/system/cpu/possible > > great. thanks for testing. I think the issue is closed and > hopefully you can follow up with fusion guys ;) >
