Re: Processor cores not properly detected/activated?

On Fri, May 23, 2014 at 7:47 PM, Tim Bishop <tim-lists_at_bishnet.net> wrote:
> I have a new quad CPU system containing four of these processors:
>
> Intel(R) Xeon(R) CPU E7-4830 v2 _at_ 2.20GHz (2200.05-MHz K8-class CPU)
>
> I've tried FreeBSD 10.0, stable/10 and head, but all of them only detect
> a maximum of 64 "CPUs". There should be 80. Here's the relevant dmesg
> output (full output attached):
>
> FreeBSD/SMP: Multiprocessor System Detected: 64 CPUs
> FreeBSD/SMP: 3 package(s) x 10 core(s) x 2 SMT threads
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  1
>  ...
>  cpu62 (AP): APIC ID: 98
>  cpu63 (AP): APIC ID: 99
>   cpu (AP): APIC ID: 100 (disabled)
>   cpu (AP): APIC ID: 101 (disabled)
>   cpu (AP): APIC ID: 102 (disabled)
>   cpu (AP): APIC ID: 103 (disabled)
>   cpu (AP): APIC ID: 104 (disabled)
>   cpu (AP): APIC ID: 105 (disabled)
>   cpu (AP): APIC ID: 112 (disabled)
>   cpu (AP): APIC ID: 113 (disabled)
>   cpu (AP): APIC ID: 114 (disabled)
>   cpu (AP): APIC ID: 115 (disabled)
>   cpu (AP): APIC ID: 116 (disabled)
>   cpu (AP): APIC ID: 117 (disabled)
>   cpu (AP): APIC ID: 118 (disabled)
>   cpu (AP): APIC ID: 119 (disabled)
>   cpu (AP): APIC ID: 120 (disabled)
>   cpu (AP): APIC ID: 121 (disabled)
>
> Firstly, it should say 4 packages, so I'm not sure why its only has 3.
> But then it goes on to detect all the "CPUs", but doesn't enable the
> last 16.
>
> acpidump shows all the "CPUs" as enabled (trimmed output):
>
>   APIC: Length=1090, Revision=1, Checksum=115,
>         OEMID=DELL, OEM Table ID=PE_SC3, OEM Revision=0x1,
>         Creator ID=DELL, Creator Revision=0x1
>         Local APIC ADDR=0xfee00000
>         Flags={PC-AT}
>
>         Type=Local APIC
>         ACPI CPU=1
>         Flags={ENABLED}
>         APIC ID=0
>
>         Type=Local APIC
>         ACPI CPU=2
>         Flags={ENABLED}
>         APIC ID=32
>
>         ...
>
>         Type=Local APIC
>         ACPI CPU=79
>         Flags={ENABLED}
>         APIC ID=89
>
>         Type=Local APIC
>         ACPI CPU=80
>         Flags={ENABLED}
>         APIC ID=121
>
> Finally, I've booted Ubuntu 14.04 (Linux 3.13) and it correctly detects
> all 80 "CPUs".
>
> Can anyone shed any light on what's happening?
>
> I'm running head at the moment and I'm happy to fiddle around as much as
> required to debug it.
>
> Thanks,
>
> Tim.
>
> --
> Tim Bishop
> http://www.bishnet.net/tim/
> PGP Key: 0x6C226B37FDF38D55
>

Try setting MAXCPU higher.  It's defined by default to 64 in,
sys/amd64/include/param.h