only 3 of 4GB memory available on amd64 8.1-RC1

[Andrey Fesenko]

On Sat, Jun 19, 2010 at 9:16 PM, Andreas Tobler <andreast-list at fgznet.ch> wrote:
> Hi all,
>
> I got my hands on a t60 with 4GB of RAM (BIOS displays it)
>
> And I installed 8.1-RC1 on it:
>
> FreeBSD 8.1-RC1 #0: Mon Jun 14 13:40:28 UTC 2010
>    root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
> Timecounter "i8254" frequency 1193182 Hz quality 0
> CPU: Intel(R) Core(TM)2 CPU         T5600  @ 1.83GHz (1828.76-MHz K8-class
> CPU)
>  Origin = "GenuineIntel"  Id = 0x6f6  Family = 6  Model = f  Stepping = 6
>
> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>  Features2=0xe3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM>
>  AMD Features=0x20100800<SYSCALL,NX,LM>
>  AMD Features2=0x1<LAHF>
>  TSC: P-state invariant
> real memory  = 4294967296 (4096 MB)
> avail memory = 3092344832 (2949 MB)
> ACPI APIC Table: <LENOVO TP-79   >
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> FreeBSD/SMP: 1 package(s) x 2 core(s)
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  1
>
>
>
> Do I need to configure something special to get the full 4GB of memory?
>
> I only found the PAE hint, but this is for x86 machines, right?
>
I think this BIOS specific, may be video rezerv


FreeBSD 9.0-CURRENT #0 r208284: Wed May 19 09:34:15 MSD 2010
    andrey at my_book:/home/andrey/obj/obj/home/andrey/src_head/sys/MY_BOOK amd64
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 CPU         T5600  @ 1.83GHz (1828.77-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x6f2  Family = 6  Model = f  Stepping = 2
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Features2=0xe3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM>
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant
real memory  = 4294967296 (4096 MB)
avail memory = 3339923456 (3185 MB)