trying to get 64 bit ubuntu to recognize all 4 gigs of ram (Intel Core2 Duo CPU)

CoffeeKing!!! · 12-25-2008, 10:22 PM

Hi
I've tried recompiling the kernel to enable highmem. I can search for the option and find it in menuconfig or xconfig. However I can't find it without the search options. I can't even find the dependencies.

this is the result of the search:

Code:

Symbol: HIGHMEM64G [=n]                                                 
 Prompt: 64GB                                                            
  Defined at arch/x86/Kconfig:866                                       
  Depends on: <choice> && !M386 && !M486                                
    Location:                                                             
  -> Processor type and features                                      
        -> High Memory Support(<choice>[=n])                            
     Selects:X86_PAE

the bios and dmidecode can see that are 4 gigs of ram. the "free" command cannot.

lshw: (note the 32 bit width) But, does that make a difference with dual channeling?

Code:

 *-pci                                                                     
  description: Host bridge                                             
   product: Mobile PM965/GM965/GL960 Memory Controller Hub              
 vendor: Intel Corporation                                            
  physical id: 100                                                     
  bus info: pci@0000:00:00.0                                           
  version: 03                                                          
   width: 32 bits                                                       
    clock: 33MHz

Any help would be greatly appreciated.

syg00 · 12-25-2008, 10:31 PM

HIGHMEM (and PAE) are 32-bit options - not 64-bit.
There is no problem with Ubuntu 64 bit seeing 4 Gig

Code:

me@ubuntu:~$ free -m 
             total       used       free     shared    buffers     cached
Mem:          3959        846       3112          0         36        295
-/+ buffers/cache:        514       3444
Swap:          925          0        925

     *-memory
          description: System Memory
          physical id: 1000
          slot: System board or motherboard
          size: 4GiB
        *-bank:0
             description: DIMM DDR Synchronous 667 MHz (1.5 ns)
             product: HYMP325S64AMP8-Y5
             vendor: AD00000000000000
             physical id: 0
             serial: 04008027
             slot: DIMM_A
             size: 2GiB
             width: 64 bits
             clock: 667MHz (1.5ns)
        *-bank:1
             description: DIMM DDR Synchronous 667 MHz (1.5 ns)
             product: HYMP325S64AMP8-Y5
             vendor: AD00000000000000
             physical id: 1
             serial: 00007026
             slot: DIMM_B
             size: 2GiB
             width: 64 bits
             clock: 667MHz (1.5ns)

Drakeo · 12-25-2008, 10:38 PM

coffe king I went through Ubuntu forums and I found there stock kernel is different from the server kernel config and build.Symbol:
HIGHMEM64G [=n] <--- =y sees 64 gig and that was one of the diferences.
Prompt: 64GB
Defined at arch/x86/Kconfig:866
Depends on: <choice> && !M386 && !M486
Location:
-> Processor type and features
-> High Memory Support(<choice>[=n])
Selects:X86_PAE
spent a lot of time researching it today and I really hope the debian and ubuntu to people where not lying to me.
hey why don't you just install the server kernel it is a thought.

CoffeeKing!!! · 12-25-2008, 10:54 PM

Quote:

Originally Posted by syg00

HIGHMEM (and PAE) are 32-bit options - not 64-bit.
There is no problem with Ubuntu 64 bit seeing 4 Gig

Code:

me@ubuntu:~$ free -m 
             total       used       free     shared    buffers     cached
Mem:          3959        846       3112          0         36        295
-/+ buffers/cache:        514       3444
Swap:          925          0        925

     *-memory
          description: System Memory
          physical id: 1000
          slot: System board or motherboard
          size: 4GiB
        *-bank:0
             description: DIMM DDR Synchronous 667 MHz (1.5 ns)
             product: HYMP325S64AMP8-Y5
             vendor: AD00000000000000
             physical id: 0
             serial: 04008027
             slot: DIMM_A
             size: 2GiB
             width: 64 bits
             clock: 667MHz (1.5ns)
        *-bank:1
             description: DIMM DDR Synchronous 667 MHz (1.5 ns)
             product: HYMP325S64AMP8-Y5
             vendor: AD00000000000000
             physical id: 1
             serial: 00007026
             slot: DIMM_B
             size: 2GiB
             width: 64 bits
             clock: 667MHz (1.5ns)

my bios states 4096 ram and "free -m" :

Code:

free -m
             total       used       free     shared    buffers    cached
Mem:          3008        825       2182          0         17       271
-/+ buffers/cache:        536       2471
Swap:         4604          0       4604

So, do you know why there is a gig missing?

CoffeeKing!!! · 12-25-2008, 10:56 PM

Quote:

Originally Posted by Drakeo

coffe king I went through Ubuntu forums and I found there stock kernel is different from the server kernel config and build.Symbol:
HIGHMEM64G [=n] <--- =y sees 64 gig and that was one of the diferences.
Prompt: 64GB
Defined at arch/x86/Kconfig:866
Depends on: <choice> && !M386 && !M486
Location:
-> Processor type and features
-> High Memory Support(<choice>[=n])
Selects:X86_PAE
spent a lot of time researching it today and I really hope the debian and ubuntu to people where not lying to me.
hey why don't you just install the server kernel it is a thought.

Drakeo
Thanks alot!
I do have the server kernel now but, I'm still getting a gig missing in free -m.

syg00 · 12-25-2008, 10:58 PM

No idea - I'd normally reckon on a mobo limitation, but if the BIOS sees it I guess that can't be the reason.

Drakeo · 12-26-2008, 12:10 AM

Quote:

Originally Posted by syg00

No idea - I'd normally reckon on a mobo limitation, but if the BIOS sees it I guess that can't be the reason.

I guess keeping things vanilla has it's benefits.
so many kernels. I like vanilla. But I did see a shared ram on a intel board ati vidio card steal 64 mb of ram

AuroraCA · 12-26-2008, 12:23 AM

Is it possible that a portion of your memory is being used for onboard video? I know that my motherboards with onboard video allocate about 800+ MB for video use.

ronlau9 · 12-26-2008, 12:41 AM

Quote:

Originally Posted by AuroraCA

Is it possible that a portion of your memory is being used for onboard video? I know that my motherboards with onboard video allocate about 800+ MB for video use.

Yeah that is correct , but you can find it out in youŕe BIOS settings
My Graphic card takes about 640 MB . it is also stated in the BIOS
so from my 4 GB 3.3 GB is left

CoffeeKing!!! · 12-26-2008, 10:28 AM

how do I find how much memory the video card is using? and when It really not show up in free -m because of that?

Lowell1947 · 12-26-2008, 10:47 AM

Drakeo is right. I have one machine I set up with the Ubuntu server edition on it. Then I installed gnome desktop. It recognizes all the ram I've been able to throw at it.You can do a minimal installation and still get the ram to be recognized. Of course I later decided I wanted a server without all the baggage of a GUI and reinstalled the server software with out a gui.

CoffeeKing!!! · 12-26-2008, 10:49 AM

Quote:

Originally Posted by Lowell1947

Drakeo is right. I have one machine I set up with the Ubuntu server edition on it. Then I installed gnome desktop. It recognizes all the ram I've been able to throw at it.You can do a minimal installation and still get the ram to be recognized. Of course I later decided I wanted a server without all the baggage of a GUI and reinstalled the server software with out a gui.

I'm running the server kernel now. same problem

CoffeeKing!!! · 12-26-2008, 10:50 AM

just to make sure-
I'd like to know how much ram the video card (or onboard video) is being given.

CoffeeKing!!! · 12-26-2008, 12:10 PM

pulling hair out now. Why the difference between "free -m" and

proc/mtrr?

Code:

reg00: base=0xfeda0000 (4077MB), size= 128KB: write-back, count=1
reg01: base=0xbf800000 (3064MB), size=   8MB: uncachable, count=1
reg02: base=0xffe00000 (4094MB), size=   2MB: write-protect, count=1
reg03: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
reg04: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
reg05: base=0xe0000000 (3584MB), size= 256MB: write-combining, count=1