Where is my RAM?

Ben

Ben

Hi,

I have a AMD64-System on a Intel E2160 with 2x2GB DDR2 RAM: 2048MB DDR2 Aeneon PC5400 CL 5
Currently running: FreeBSD 8.1-RELEASE

dmesg says:
Code: 
CPU: Intel(R) Pentium(R) Dual  CPU  E2160  @ 1.80GHz (1795.04-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x6fd  Family = 6  Model = f  Stepping = 13
  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=0xe39d<SSE3,DTES64,MON,DS_CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM>
  AMD Features=0x20000800<SYSCALL,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant
real memory  = 4294967296 (4096 MB)
avail memory = 3349757952 (3194 MB)

A memory tool says:
Code: 
SYSTEM MEMORY INFORMATION:
mem_wire: 1245839360 ( 1188MB) [ 36%] Wired: disabled for paging out
mem_active: + 548597760 ( 523MB) [ 16%] Active: recently referenced
mem_inactive:+ 111595520 ( 106MB) [ 3%] Inactive: recently not referenced
mem_cache: + 524288 ( 0MB) [ 0%] Cached: almost avail. for allocation
mem_free: + 1458679808 ( 1391MB) [ 43%] Free: fully available for allocation
mem_gap_vm: + 3973120 ( 3MB) [ 0%] Memory gap: UNKNOWN
-------------- ------------ ----------- ------
mem_all: = 3369209856 ( 3213MB) [100%] Total real memory managed
mem_gap_sys: + 102670336 ( 97MB) Memory gap: Kernel?!
-------------- ------------ -----------
mem_phys: = 3471880192 ( 3311MB) Total real memory available
mem_gap_hw: + 286216192 ( 272MB) Memory gap: Segment Mappings?!
-------------- ------------ -----------
mem_hw: = 3758096384 ( 3584MB) Total real memory installed

SYSTEM MEMORY SUMMARY:
mem_used: 2187296768 ( 2085MB) [ 58%] Logically used memory
mem_avail: + 1570799616 ( 1498MB) [ 41%] Logically available memory
-------------- ------------ ----------- ------
mem_total: = 3758096384 ( 3584MB) [100%] Logically total memory

Where are the missing MB and how can I make them come back? I have a onboard video card but it is set in the BIOS to 2 or 4 MB RAM even it says something about AGB and 256MB in dmesg at start up (I don't have it at hand).

Do I need to tweak certain settings in the BIOS to adapt or what could I do?

Thanks for help/hints.
 
Can you post your [cmd=]uname -a[/cmd]

I have a feeling you're running i386 instead of amd64.
 
That would have been too easy :)

Code: 
FreeBSD 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC 2010     root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
 
Ben said:
That would have been too easy :)
Click to expand...
I know but it won't be the first time it happens ;)

In your BIOS try turning off caching of video and BIOS. None of it is needed but it does take up some memory.
 
Ben said:
it says something about AGB and 256MB in dmesg at start up (I don't have it at hand).
Click to expand...

Search for "agp aperture size" in your bios. This is what dmesg is reporting ... something like: "AGP agp aperture size = 256MB"

---

If this is a server just remove

Code: 
device          agp             # support several AGP chipsets

from your kernel config.

---

If the dmesg output is already rotated and you need the output from the boot time:

Code: 
cat /var/run/dmesg.boot | less
 
Yes, thats the message I see at boot up / dmesg.

I will check the bios first as I would like to keep the GENERIC Kernel.

In case I will recompile the kernel.

Thanks for your help!
 
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