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Old 06-04-2011, 01:47 PM   #1
reed68
LQ Newbie
 
Registered: Aug 2007
Posts: 28

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64-bit doesn't show 4GB RAM


Hi,

I'm using a 64-bit release. But, my PC doesn't seem to show the full 4GB of RAM that is installed. It shows about 3.4 to 3.6GB of RAM (please see attached picture).

I thought that if I could install a 64-bit OS that would mean that I have a 64-bit capable processor. I thought using a 64-bit release would show all 4GB or RAM on my PC.

What am I doing wrong? My CPU is a Pentium 4 Prescott DT 630.

More information on my system is below:
Code:
$ lsb_release -rd
Description:	Debian GNU/Linux 6.0.1 (squeeze)
Release:	6.0.1

$ uname -a	
Linux kub 2.6.32-5-amd64 #1 SMP Wed May 18 23:13:22 UTC 2011 x86_64 GNU/Linux

$ free
             total       used       free     shared    buffers     cached
Mem:       3610004    3541544      68460          0      32092     342816
-/+ buffers/cache:    3166636     443368
Swap:      1602552     745724     856828

$ cat /proc/cpuinfo 
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	: Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping	: 3
cpu MHz		: 2800.000
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 0
initial apicid	: 0
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: 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 ht tm pbe syscall nx lm constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr
bogomips	: 5984.66
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 15
model		: 4
model name	: Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping	: 3
cpu MHz		: 3000.000
cache size	: 2048 KB
physical id	: 0
siblings	: 2
core id		: 0
cpu cores	: 1
apicid		: 1
initial apicid	: 1
fpu		: yes
fpu_exception	: yes
cpuid level	: 5
wp		: yes
flags		: 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 ht tm pbe syscall nx lm constant_tsc pebs bts pni dtes64 monitor ds_cpl est cid cx16 xtpr
bogomips	: 5984.96
clflush size	: 64
cache_alignment	: 128
address sizes	: 36 bits physical, 48 bits virtual
power management:

$ cat /proc/meminfo 
MemTotal:        3610004 kB
MemFree:           82516 kB
Buffers:           32920 kB
Cached:           342044 kB
SwapCached:       219392 kB
Active:          2493808 kB
Inactive:         666620 kB
Active(anon):    2318380 kB
Inactive(anon):   489508 kB
Active(file):     175428 kB
Inactive(file):   177112 kB
Unevictable:          36 kB
Mlocked:              36 kB
SwapTotal:       1602552 kB
SwapFree:         857416 kB
Dirty:              1088 kB
Writeback:             0 kB
AnonPages:       2608940 kB
Mapped:           159508 kB
Shmem:             22416 kB
Slab:             259916 kB
SReclaimable:     232852 kB
SUnreclaim:        27064 kB
KernelStack:        4080 kB
PageTables:        55776 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     3407552 kB
Committed_AS:    6214836 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      118812 kB
VmallocChunk:   34359610876 kB
HardwareCorrupted:     0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:     1204784 kB
DirectMap2M:     2463744 kB
Thank you for your time and help.
Attached Thumbnails
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Views:	17
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ID:	7216  
 
Old 06-04-2011, 02:09 PM   #2
johnsfine
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The problem is in either the motherboard or the BIOS, not in the OS.

This is discussed in many other threads at LQ.

If it is not a motherboard issue, there is likely a BIOS setting that can be changed to fix the problem. But the details vary a lot by BIOS version, so it would be hard to guide you to the correct BIOS setting even if it exists.

Detailed motherboard info, or better yet a link to an online copy of the motherboard manual, would make it easier for someone to help you.

Some related threads:

Here the OP started by looking in many of the right places to verify that what is usually a BIOS or motherboard issue actually was. In the unusual case shown in that thread, the problem actually wasn't BIOS/Motherboard:
http://www.linuxquestions.org/questi...6/#post4313393

This thread touches on two of the common topics within this issue: Ram used by the integrated graphics, and motherboard specs claiming to support 4GiB when they really support slightly less. I don't see a clear final answer in this thread:
http://www.linuxquestions.org/questi...my-ram-867990/

Here is one of the (unfortunately unusual) cases in which someone I encouraged to look for the setting in his BIOS not only found it, but also reported back to the thread what he found:
http://www.linuxquestions.org/questi...2/#post3150066

Last edited by johnsfine; 06-04-2011 at 02:43 PM.
 
Old 06-04-2011, 03:06 PM   #3
John VV
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may or may not help

you have a AMD 64 bit kernel for a INTEL cpu ???????
 
Old 06-04-2011, 03:15 PM   #4
MrCode
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Quote:
you have a AMD 64 bit kernel for a INTEL cpu ???????
"AMD64", in most cases, simply refers to the x86_64 architecture, whether the chip itself is made by AMD, Intel, or some other manufacturer…

Also, if this is the OP's CPU, then it indeed has 64-bit capability. It's doubtful the 32/64-bit difference has anything to do with this problem, though, as theoretically even a 32-bit kernel can address 4 GiB of memory.

Last edited by MrCode; 06-04-2011 at 04:41 PM. Reason: Just remembered: PAE is only required for addressing more than 4 GiB
 
Old 06-04-2011, 04:21 PM   #5
reed68
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Registered: Aug 2007
Posts: 28

Original Poster
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Thanks.

I didn't know that the motherboard might be the issue. Below is the output of dmidecode and it indicates "Maximum Capacity: 4 GB"

Output from dmidecode:
Code:
$ sudo dmidecode -q
BIOS Information
	Vendor: Dell Inc.                
	Version: A07
	Release Date: 01/08/2007
	Address: 0xF0000
	Runtime Size: 64 kB
	ROM Size: 512 kB
	Characteristics:
		PCI is supported
		PNP is supported
		APM is supported
		BIOS is upgradeable
		BIOS shadowing is allowed
		Boot from CD is supported
		Selectable boot is supported
		EDD is supported
		Japanese floppy for Toshiba 1.2 MB is supported (int 13h)
		Print screen service is supported (int 5h)
		8042 keyboard services are supported (int 9h)
		Serial services are supported (int 14h)
		Printer services are supported (int 17h)
		ACPI is supported
		USB legacy is supported
		LS-120 boot is supported
		BIOS boot specification is supported
		Function key-initiated network boot is supported

System Information
	Manufacturer: Dell Inc.                
	Product Name: Dell DXP051                  
	Version: Not Specified
	Serial Number: CPM4Q81
	UUID: 44454C4C-5000-104D-8034-C3C04F513831
	Wake-up Type: APM Timer

Base Board Information
	Manufacturer: Dell Inc.          
	Product Name: 0YC523
	Version:    
	Serial Number: ..CN7082159AG0H8.

Chassis Information
	Manufacturer: Dell Inc.                
	Type: Tower
	Lock: Not Present
	Version: Not Specified
	Serial Number: CPM4Q81
	Asset Tag:           
	Boot-up State: Safe
	Power Supply State: Safe
	Thermal State: Safe
	Security Status: None

Processor Information
	Socket Designation: Microprocessor
	Type: Central Processor
	Family: Pentium 4
	Manufacturer: Intel
	ID: 43 0F 00 00 FF FB EB BF
	Signature: Type 0, Family 15, Model 4, Stepping 3
	Flags:
		FPU (Floating-point unit on-chip)
		VME (Virtual mode extension)
		DE (Debugging extension)
		PSE (Page size extension)
		TSC (Time stamp counter)
		MSR (Model specific registers)
		PAE (Physical address extension)
		MCE (Machine check exception)
		CX8 (CMPXCHG8 instruction supported)
		APIC (On-chip APIC hardware supported)
		SEP (Fast system call)
		MTRR (Memory type range registers)
		PGE (Page global enable)
		MCA (Machine check architecture)
		CMOV (Conditional move instruction supported)
		PAT (Page attribute table)
		PSE-36 (36-bit page size extension)
		CLFSH (CLFLUSH instruction supported)
		DS (Debug store)
		ACPI (ACPI supported)
		MMX (MMX technology supported)
		FXSR (Fast floating-point save and restore)
		SSE (Streaming SIMD extensions)
		SSE2 (Streaming SIMD extensions 2)
		SS (Self-snoop)
		HTT (Hyper-threading technology)
		TM (Thermal monitor supported)
		PBE (Pending break enabled)
	Version: Not Specified
	Voltage: 1.3 V
	External Clock: 800 MHz
	Max Speed: 4000 MHz
	Current Speed: 3000 MHz
	Status: Populated, Enabled
	Upgrade: ZIF Socket

Cache Information
	Socket Designation: Not Specified
	Configuration: Enabled, Not Socketed, Level 1
	Operational Mode: Write Back
	Location: Internal
	Installed Size: 16 KB
	Maximum Size: 16 KB
	Supported SRAM Types:
		Other
	Installed SRAM Type: Other
	Speed: Unknown
	Error Correction Type: None
	System Type: Data
	Associativity: 8-way Set-associative

Cache Information
	Socket Designation: Not Specified
	Configuration: Enabled, Not Socketed, Level 2
	Operational Mode: Varies With Memory Address
	Location: Internal
	Installed Size: 2048 KB
	Maximum Size: 2048 KB
	Supported SRAM Types:
		Other
	Installed SRAM Type: Other
	Speed: Unknown
	Error Correction Type: Single-bit ECC
	System Type: Unified
	Associativity: 8-way Set-associative

Port Connector Information
	Internal Reference Designator: USB1
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Access Bus (USB)
	Port Type: USB

Port Connector Information
	Internal Reference Designator: USB2
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Access Bus (USB)
	Port Type: USB

Port Connector Information
	Internal Reference Designator: USB3
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Access Bus (USB)
	Port Type: USB

Port Connector Information
	Internal Reference Designator: USB4
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Access Bus (USB)
	Port Type: USB

Port Connector Information
	Internal Reference Designator: USB5
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Access Bus (USB)
	Port Type: USB

Port Connector Information
	Internal Reference Designator: USB6
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Access Bus (USB)
	Port Type: USB

Port Connector Information
	Internal Reference Designator: USB7
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Access Bus (USB)
	Port Type: USB

Port Connector Information
	Internal Reference Designator: USB8
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Access Bus (USB)
	Port Type: USB

Port Connector Information
	Internal Reference Designator: ENET
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: RJ-45
	Port Type: Network Port

Port Connector Information
	Internal Reference Designator: MIC
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Mini Jack (headphones)
	Port Type: Audio Port

Port Connector Information
	Internal Reference Designator: LINE-OUT
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Mini Jack (headphones)
	Port Type: Audio Port

Port Connector Information
	Internal Reference Designator: LINE-IN
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Mini Jack (headphones)
	Port Type: Audio Port

Port Connector Information
	Internal Reference Designator: HP-OUT
	Internal Connector Type: None
	External Reference Designator: Not Specified
	External Connector Type: Mini Jack (headphones)
	Port Type: Audio Port

System Slot Information
	Designation: PEG
	Type: x16 PCI Express
	Current Usage: In Use
	Length: Long
	ID: 10
	Characteristics:
		3.3 V is provided
		PME signal is supported

System Slot Information
	Designation: SLOT1  
	Type: x1 PCI Express
	Current Usage: Available
	Length: Long
	ID: 1
	Characteristics:
		3.3 V is provided
		PME signal is supported

System Slot Information
	Designation: SLOT3  
	Type: 32-bit PCI
	Current Usage: In Use
	Length: Long
	ID: 3
	Characteristics:
		5.0 V is provided
		3.3 V is provided
		PME signal is supported

System Slot Information
	Designation: SLOT4  
	Type: x4 PCI Express
	Current Usage: Available
	Length: Long
	ID: 4
	Characteristics:
		3.3 V is provided
		PME signal is supported

System Slot Information
	Designation: SLOT5  
	Type: 32-bit PCI
	Current Usage: In Use
	Length: Long
	ID: 5
	Characteristics:
		5.0 V is provided
		3.3 V is provided
		PME signal is supported

System Slot Information
	Designation: SLOT6  
	Type: 32-bit PCI
	Current Usage: Available
	Length: Long
	ID: 6
	Characteristics:
		5.0 V is provided
		3.3 V is provided
		PME signal is supported

On Board Device Information
	Type: Ethernet
	Status: Enabled
	Description: Intel PRO/100 VE Network Connections

On Board Device Information
	Type: Sound
	Status: Disabled
	Description: Intel(R) High Definition Audio Controller

OEM Strings
	String 1: www.dell.com

BIOS Language Information
	Installable Languages: 1
		en|US|iso8859-1
	Currently Installed Language: en|US|iso8859-1

System Event Log
	Area Length: 2049 bytes
	Header Start Offset: 0x0000
	Header Length: 16 bytes
	Data Start Offset: 0x0010
	Access Method: Memory-mapped physical 32-bit address
	Access Address: 0xFFF81000
	Status: Valid, Not Full
	Change Token: 0x0000000F
	Header Format: Type 1
	Supported Log Type Descriptors: 3
	Descriptor 1: POST error
	Data Format 1: POST results bitmap
	Descriptor 2: System limit exceeded
	Data Format 2: System management
	Descriptor 3: Log area reset/cleared
	Data Format 3: None

Physical Memory Array
	Location: System Board Or Motherboard
	Use: System Memory
	Error Correction Type: None
	Maximum Capacity: 4 GB
	Number Of Devices: 4

Memory Device
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 1024 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM_1
	Bank Locator: Not Specified
	Type: DDR
	Type Detail: Synchronous
	Speed: 667 MHz (1.5 ns)
	Manufacturer: 2C00000000000000
	Serial Number: E40F2DDF
	Asset Tag: Not Specified
	Part Number: 8HTF12864AY-667G2 

Memory Device
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 1024 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM_3
	Bank Locator: Not Specified
	Type: DDR
	Type Detail: Synchronous
	Speed: 667 MHz (1.5 ns)
	Manufacturer: 2C00000000000000
	Serial Number: E40F2DAE
	Asset Tag: Not Specified
	Part Number: 8HTF12864AY-667G2 

Memory Device
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 1024 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM_2
	Bank Locator: Not Specified
	Type: DDR
	Type Detail: Synchronous
	Speed: 667 MHz (1.5 ns)
	Manufacturer: 2C00000000000000
	Serial Number: E40F2D9A
	Asset Tag: Not Specified
	Part Number: 8HTF12864AY-667G2 

Memory Device
	Total Width: 64 bits
	Data Width: 64 bits
	Size: 1024 MB
	Form Factor: DIMM
	Set: None
	Locator: DIMM_4
	Bank Locator: Not Specified
	Type: DDR
	Type Detail: Synchronous
	Speed: 667 MHz (1.5 ns)
	Manufacturer: 2C00000000000000
	Serial Number: E40F2E52
	Asset Tag: Not Specified
	Part Number: 8HTF12864AY-667G2 

Memory Array Mapped Address
	Starting Address: 0x00000000000
	Ending Address: 0x000FFFFFFFF
	Range Size: 4 GB
	Partition Width: 0

Memory Device Mapped Address
	Starting Address: 0x00000000000
	Ending Address: 0x0003FFFFFFF
	Range Size: 1 GB
	Partition Row Position: 1

Memory Device Mapped Address
	Starting Address: 0x00040000000
	Ending Address: 0x0007FFFFFFF
	Range Size: 1 GB
	Partition Row Position: 1

Memory Device Mapped Address
	Starting Address: 0x00080000000
	Ending Address: 0x000BFFFFFFF
	Range Size: 1 GB
	Partition Row Position: 1

Memory Device Mapped Address
	Starting Address: 0x000C0000000
	Ending Address: 0x000FFFFFFFF
	Range Size: 1 GB
	Partition Row Position: 1

Hardware Security
	Power-On Password Status: Enabled
	Keyboard Password Status: Not Implemented
	Administrator Password Status: Enabled
	Front Panel Reset Status: Not Implemented

	System Power Controls
	Next Scheduled Power-on: *-* 00:00:00

Cooling Device
	Type: Fan
	Status: OK
	OEM-specific Information: 0x0000DD00

Cooling Device
	Type: Fan
	Status: OK
	OEM-specific Information: 0x0000DD01

System Boot Information
	Status: No errors detected
Output from dmesg | grep BIOS:
Code:
$ dmesg | grep BIOS
[    0.000000] BIOS-provided physical RAM map:
[    0.000000]  BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
[    0.000000]  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
[    0.000000]  BIOS-e820: 0000000000100000 - 00000000dfe8cc00 (usable)
[    0.000000]  BIOS-e820: 00000000dfe8cc00 - 00000000dfe8ec00 (ACPI NVS)
[    0.000000]  BIOS-e820: 00000000dfe8ec00 - 00000000dfe90c00 (ACPI data)
[    0.000000]  BIOS-e820: 00000000dfe90c00 - 00000000e0000000 (reserved)
[    0.000000]  BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved)
[    0.000000]  BIOS-e820: 00000000fec00000 - 00000000fed00400 (reserved)
[    0.000000]  BIOS-e820: 00000000fed20000 - 00000000feda0000 (reserved)
[    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
[    0.000000]  BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
[    0.000000]   #0 [0000000000 - 0000001000]   BIOS data page ==> [0000000000 - 0000001000]
[    0.000000]   #4 [000009fc00 - 0000100000]    BIOS reserved ==> [000009fc00 - 0000100000]
[    0.000000] Calgary: detecting Calgary via BIOS EBDA area
[    0.262322] ACPI: BIOS _OSI(Linux) query ignored
Below is output from cat /proc/iomem:
Code:
$ cat /proc/iomem
00000000-0009ffff : System RAM
000c0000-000d3fff : pnp 00:06
000f0000-000fffff : reserved
00100000-dfe8cbff : System RAM
  01000000-01302474 : Kernel code
  01302475-014dceff : Kernel data
  0157b000-0168c453 : Kernel bss
dfe8cc00-dfe8ebff : ACPI Non-volatile Storage
dfe8ec00-dfe90bff : ACPI Tables
dfe90c00-dfffffff : reserved
e0000000-efffffff : PCI Bus 0000:01
  e0000000-efffffff : 0000:01:00.0
f0000000-f3ffffff : PCI MMCONFIG 0 [00-3f]
  f0000000-f3ffffff : reserved
    f0000000-f3ffffff : pnp 00:07
f4000000-f41fffff : PCI Bus 0000:02
f4200000-f43fffff : PCI Bus 0000:03
f4400000-f45fffff : PCI Bus 0000:03
f4600000-f47fffff : PCI Bus 0000:04
f9700000-f97fffff : PCI Bus 0000:05
  f97ff000-f97fffff : 0000:05:02.0
    f97ff000-f97fffff : firewire_ohci
f9800000-f9efffff : PCI Bus 0000:04
  f9800000-f9bfffff : 0000:04:00.0
    f9800000-f9bfffff : e1000e
  f9ee0000-f9efffff : 0000:04:00.0
    f9ee0000-f9efffff : e1000e
f9f00000-f9ffffff : PCI Bus 0000:02
fa000000-feafffff : PCI Bus 0000:01
  fa000000-fbffffff : 0000:01:00.0
  fd000000-fdffffff : 0000:01:00.0
    fd000000-fdffffff : nvidia
  fea00000-fea1ffff : 0000:01:00.0
febffc00-febfffff : 0000:00:1f.2
  febffc00-febfffff : ahci
fec00000-fed003ff : reserved
  fec00000-fec00fff : IOAPIC 0
  fed00000-fed003ff : HPET 0
fed20000-fed9ffff : reserved
  fed20000-fed9ffff : pnp 00:06
feda0000-fedacfff : pnp 00:07
fee00000-feefffff : reserved
  fee00000-feefffff : pnp 00:06
    fee00000-fee00fff : Local APIC
ffa80800-ffa80bff : 0000:00:1d.7
  ffa80800-ffa80bff : ehci_hcd
ffb00000-ffffffff : reserved
  ffb00000-ffbfffff : pnp 00:06
  ffc00000-ffffffff : pnp 00:06
I have no ability to alter RAM via BIOS on this PC.

Last edited by reed68; 06-04-2011 at 04:23 PM.
 
Old 06-04-2011, 06:13 PM   #6
johnsfine
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Quote:
Originally Posted by reed68 View Post
Below is the output of dmidecode and it indicates "Maximum Capacity: 4 GB"
That usually means the max usable ram is significantly lower than 4GB (typically around 3.5GB) and there is nothing the OS can do about it.

It is still possible there is some BIOS setting to let you use significantly closer to 4GB than is now usable. But it isn't very likely.

Quote:
Output from dmesg | grep BIOS:
That unambiguously shows the problem is either motherboard or BIOS and not Linux. I assumed that from the start in this thread, but this confirms that assumption.

Quote:
I have no ability to alter RAM via BIOS on this PC.
That setting would not be in the ram or memory section of the BIOS menu. If it exists, it would be confusingly located and named.

But more likely it isn't there and you can't enable more ram than you now have.

Last edited by johnsfine; 06-04-2011 at 06:15 PM.
 
Old 06-04-2011, 07:04 PM   #7
reed68
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OK. Thanks for clearing that up for me.

Last edited by reed68; 06-04-2011 at 07:06 PM.
 
  


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