More than 32 CPUs under 8.4-P

[Dennis Glatting]

I have a 4x16=64 core server running FreeBSD 8.4-P but only two of the
CPUs (2x16=32) are enabled. Enabling the other 32 isn't as simple as
changing MAXCPU in param.h (apparently) and recompiling.

What do I need to do to enable the other 32 cores?


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FreeBSD 8.4-PRERELEASE #0 r250401: Wed May  8 21:46:23 PDT 2013
    root at mc:/disk-2/obj/disk-1/src/sys/GENERIC amd64
gcc version 4.2.1 20070831 patched [FreeBSD]
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Opteron(TM) Processor 6274                  (2200.04-MHz
K8-class CPU)
  Origin = "AuthenticAMD"  Id = 0x600f12  Family = 15  Model = 1
Stepping = 2

Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>

Features2=0x1e98220b<SSE3,PCLMULQDQ,MON,SSSE3,CX16,SSE4.1,SSE4.2,POPCNT,AESNI,XSAVE,OSXSAVE,AVX>
  AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
  AMD
Features2=0x1c9bfff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,XOP,SKINIT,WDT,LWP,FMA4,NodeId,Topology,<b23>,<b24>>
  TSC: P-state invariant
real memory  = 137438953472 (131072 MB)
avail memory = 132427862016 (126293 MB)
ACPI APIC Table: <120911 APIC1027>
FreeBSD/SMP: Multiprocessor System Detected: 32 CPUs
FreeBSD/SMP: 2 package(s) x 16 core(s)