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Total RAM not recognised

 
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# 1  
Old 03-01-2012
Total RAM not recognised
Hi We have a redhat 4 with 8GB ram in it
but free -m only recognises 3 GB of total ram
please could some one help me why this happens

HP syetems insight manager showing 4* 2 GB RAMS

Code:
[root@redhat ~]# free -m
             total       used       free     shared    buffers     cached
Mem:          3290       3220         69          0        231       1013
-/+ buffers/cache:       1975       1315
Swap:        16002          0      16001
[root@redhast ~]#

Code:
[root@redhat ~]# dmidecode 
Handle 0x1100
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 2048 MB
                Form Factor: DIMM
                Set: 1
                Locator: DIMM 1A
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: 667 MHz (1.5 ns)
Handle 0x1101
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: No Module Installed
                Form Factor: DIMM
                Set: 3
                Locator: DIMM 2C
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: Unknown
Handle 0x1102
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
 Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 2048 MB
                Form Factor: DIMM
                Set: 1
                Locator: DIMM 3A
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: 667 MHz (1.5 ns)
Handle 0x1103
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: No Module Installed
                Form Factor: DIMM
                Set: 3
                Locator: DIMM 4C
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: Unknown
Handle 0x1104
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 2048 MB
                Form Factor: DIMM
                Set: 2
                Locator: DIMM 5B
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: 667 MHz (1.5 ns)
Handle 0x1105
        DMI type 17, 23 bytes.
Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: No Module Installed
                Form Factor: DIMM
                Set: 4
                Locator: DIMM 6D
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: Unknown
Handle 0x1106
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 2048 MB
                Form Factor: DIMM
                Set: 2
                Locator: DIMM 7B
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: 667 MHz (1.5 ns)
Handle 0x1107
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: No Module Installed
                Form Factor: DIMM
                Set: 4
                Locator: DIMM 8D
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: Unknown


what could be the reason

Code:
[root@redhat ~]# uname -a
Linux redhat 2.6.9-78.EL #1 Wed Jul 9 15:27:01 EDT 2008 i686 i686 i386 GNU/Linux

Code:
 
[root@redhat ~]# cat /etc/redhat-release
Red Hat Enterprise Linux AS release 4 (Nahant Update 2)
[root@redhat ~]#

# 2  
Old 03-01-2012
Does this motherboard actually support >4GB RAM?
# 3  
Old 03-01-2012
Sometimes 32 bit operating systems cannot recognize memory greater than 4 GB .
It depends on the kernel configuration. Out of the box, the 32-bit version of Linux can see about 3.3 GB of RAM.
# 4  
Old 03-01-2012
Quote:
Originally Posted by codemaniac
Sometimes 32 bit operating systems cannot recognize memory greater than 4 GB .
I wouldn't expect that to be true for decades now... Certainly a 32-bit kernel can support more than 4GB of RAM, even if individual processes running in a 32-bit system can't, unless Linux was compiled in a very limited memory mode.

On the other hand, many 32-bit boards don't support greater than 4 gigs of RAM.
# 5  
Old 03-01-2012
for 32 bit OS architectures , technically a process can access 2^32 of memory space .
Means 4 gigs .But with PAE feature of the kernel allows a process to use more memory .

Physical Address Extension (PAE) is a feature to allow (32-bit) x86 processors to access a physical address space (including random access memory and memory mapped devices) larger than 4 gigabytes.
# 6  
Old 03-01-2012
Quote:
Originally Posted by Corona688
Does this motherboard actually support >4GB RAM?
yes i think
the maximun allowed is 32 gigs from dmidecode

Code:
# dmidecode 2.2
SMBIOS 2.3 present.
66 structures occupying 1803 bytes.
Table at 0x000EE000.
Handle 0x0000
        DMI type 0, 20 bytes.
        BIOS Information
                Vendor: HP
                Version: P58
                Release Date: 11/08/2006
                Address: 0xF0000
                Runtime Size: 64 kB
                ROM Size: 4096 kB
                Characteristics:
                        PCI is supported
                        PNP is supported
                        BIOS is upgradeable
                        BIOS shadowing is allowed
                        ESCD support is available
Boot from CD is supported
                        Selectable boot is supported
                        5.25"/360 KB floppy services are supported (int 13h)
                        5.25"/1.2 MB floppy services are supported (int 13h)
                        3.5"/720 KB floppy services are 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)
                        CGA/mono video services are supported (int 10h)
                        ACPI is supported
                        USB legacy is supported
                        BIOS boot specification is supported
Handle 0x0100
        DMI type 1, 25 bytes.
        System Information
                Manufacturer: HP
                Product Name: ProLiant DL360 G5
                Version: Not Specified
                Serial Number: GB87065F7K
                UUID: 33393935-3234-4742-3837-30363546374B
                Wake-up Type: Power Switch
Handle 0x0300
        DMI type 3, 17 bytes.
        Chassis Information
                Manufacturer: HP
                Type: Unknown
                Lock: Not Present
                Version: Not Specified
                Serial Number: GB87065F7K
                Asset Tag:
                Boot-up State: Unknown
                Power Supply State: Unknown
                Thermal State: Unknown
                Security Status: Unknown
                OEM Information: 0x00000000
Handle 0x0400
        DMI type 4, 40 bytes.
        Processor Information
                Socket Designation: Proc 1
                Type: Central Processor
                Family: Xeon
                Manufacturer: Intel
                ID: F6 06 00 00 FF FB EB BF
                Signature: Type 0, Family 6, Model F, Stepping 6
                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)
                        SBF (Signal break on FERR)
                Version: Not Specified
                Voltage: 1.4 V
                External Clock: 1333 MHz
                Max Speed: 4800 MHz
                Current Speed: 2000 MHz
                Status: Populated, Enabled
                Upgrade: ZIF Socket
                L1 Cache Handle: 0x0710
                L2 Cache Handle: 0x0720
                L3 Cache Handle: 0x0730
                Serial Number: Not Specified
                Asset Tag: Not Specified
                Part Number: Not Specified
Handle 0x0406
        DMI type 4, 40 bytes.
        Processor Information
                Socket Designation: Proc 2
                Type: Central Processor
                Family: Xeon
                Manufacturer: Intel
                ID: F6 06 00 00 FF FB EB BF
                Signature: Type 0, Family 6, Model F, Stepping 6
                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)
                        SBF (Signal break on FERR)
                Version: Not Specified
                Voltage: 1.4 V
                External Clock: 1333 MHz
                Max Speed: 4800 MHz
                Current Speed: 2000 MHz
                Status: Populated, Idle
                Upgrade: ZIF Socket
                L1 Cache Handle: 0x0716
                L2 Cache Handle: 0x0726
                L3 Cache Handle: 0x0736
                Serial Number: Not Specified
                Asset Tag: Not Specified
                Part Number: Not Specified
Handle 0x0710
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Processor 1 Internal L1 Cache
                Configuration: Enabled, Not Socketed, Level 1
                Operational Mode: Write Back
                Location: Internal
 Installed Size: 64 KB
                Maximum Size: 128 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Single-bit ECC
                System Type: Data
                Associativity: 8-way Set-associative
Handle 0x0716
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Processor 2 Internal L1 Cache
                Configuration: Enabled, Not Socketed, Level 1
                Operational Mode: Write Back
                Location: Internal
                Installed Size: 64 KB
                Maximum Size: 128 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Single-bit ECC
                System Type: Data
                Associativity: 8-way Set-associative
Handle 0x0720
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Processor 1 Internal L2 Cache
                Configuration: Enabled, Not Socketed, Level 2
                Operational Mode: Write Back
                Location: Internal
                Installed Size: 4096 KB
                Maximum Size: 16384 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Single-bit ECC
                System Type: Unknown
                Associativity: 8-way Set-associative
Handle 0x0726
        DMI type 7, 19 bytes.
Cache Information
                Socket Designation: Processor 2 Internal L2 Cache
                Configuration: Enabled, Not Socketed, Level 2
                Operational Mode: Write Back
                Location: Internal
                Installed Size: 4096 KB
                Maximum Size: 16384 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Single-bit ECC
                System Type: Unknown
                Associativity: 8-way Set-associative
Handle 0x0730
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Processor 1 Internal L3 Cache
                Configuration: Disabled, Not Socketed, Level 3
                Operational Mode: Unknown
                Location: Internal
                Installed Size: 0 KB
                Maximum Size: 8192 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
                Error Correction Type: Single-bit ECC
                System Type: Unknown
                Associativity: Other
Handle 0x0736
        DMI type 7, 19 bytes.
        Cache Information
                Socket Designation: Processor 2 Internal L3 Cache
                Configuration: Disabled, Not Socketed, Level 3
                Operational Mode: Unknown
                Location: Internal
                Installed Size: 0 KB
                Maximum Size: 8192 KB
                Supported SRAM Types:
                        Burst
                Installed SRAM Type: Burst
                Speed: Unknown
Error Correction Type: Single-bit ECC
                System Type: Unknown
                Associativity: Other
Handle 0x0801
        DMI type 8, 9 bytes.
        Port Connector Information
                Internal Reference Designator: J58
                Internal Connector Type: Access Bus (USB)
                External Reference Designator: USB Port 1
                External Connector Type: Access Bus (USB)
                Port Type: USB
Handle 0x0802
        DMI type 8, 9 bytes.
        Port Connector Information
                Internal Reference Designator: J58
                Internal Connector Type: Access Bus (USB)
                External Reference Designator: USB Port 2
                External Connector Type: Access Bus (USB)
                Port Type: USB
Handle 0x0803
        DMI type 8, 9 bytes.
        Port Connector Information
                Internal Reference Designator: J58
                Internal Connector Type: Access Bus (USB)
                External Reference Designator: USB Port 3
                External Connector Type: Access Bus (USB)
                Port Type: USB
Handle 0x0901
        DMI type 9, 13 bytes.
        System Slot Information
                Designation: PCI-E Slot 1
                Type: <OUT OF SPEC><OUT OF SPEC>
                Current Usage: Available
                Length: Short
                Characteristics:
                        3.3 V is provided
                        PME signal is supported
Handle 0x0902
        DMI type 9, 13 bytes.
        System Slot Information
                Designation: PCI-E Slot 2
                Type: <OUT OF SPEC><OUT OF SPEC>
                Current Usage: Available
 Length: Long
                Characteristics:
                        3.3 V is provided
                        PME signal is supported
Handle 0x0B00
        DMI type 11, 5 bytes.
        OEM Strings
                String 1: Product ID: 399524-B21
Handle 0x1000
        DMI type 16, 15 bytes.
        Physical Memory Array
                Location: System Board Or Motherboard
                Use: System Memory
                Error Correction Type: Single-bit ECC
                Maximum Capacity: 32 GB
                Error Information Handle: Not Provided
                Number Of Devices: 8
Handle 0x1100
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 2048 MB
                Form Factor: DIMM
                Set: 1
                Locator: DIMM 1A
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: 667 MHz (1.5 ns)
Handle 0x1101
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: No Module Installed
                Form Factor: DIMM
                Set: 3
                Locator: DIMM 2C
Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: Unknown
Handle 0x1102
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 2048 MB
                Form Factor: DIMM
                Set: 1
                Locator: DIMM 3A
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: 667 MHz (1.5 ns)
Handle 0x1103
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: No Module Installed
                Form Factor: DIMM
                Set: 3
                Locator: DIMM 4C
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: Unknown
Handle 0x1104
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 2048 MB
                Form Factor: DIMM
Set: 2
                Locator: DIMM 5B
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: 667 MHz (1.5 ns)
Handle 0x1105
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: No Module Installed
                Form Factor: DIMM
                Set: 4
                Locator: DIMM 6D
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: Unknown
Handle 0x1106
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
                Size: 2048 MB
                Form Factor: DIMM
                Set: 2
                Locator: DIMM 7B
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: 667 MHz (1.5 ns)
Handle 0x1107
        DMI type 17, 23 bytes.
        Memory Device
                Array Handle: 0x1000
                Error Information Handle: Not Provided
                Total Width: 72 bits
                Data Width: 64 bits
 Size: No Module Installed
                Form Factor: DIMM
                Set: 4
                Locator: DIMM 8D
                Bank Locator: Not Specified
                Type: <OUT OF SPEC>
                Type Detail: Synchronous
                Speed: Unknown
Handle 0x1300
        DMI type 19, 15 bytes.
        Memory Array Mapped Address
                Starting Address: 0x00000000000
                Ending Address: 0x0022FFFFFFF
                Range Size: 8960 MB
                Physical Array Handle: 0x1000
                Partition Width: 0
Handle 0x1400
        DMI type 20, 19 bytes.
        Memory Device Mapped Address
                Starting Address: 0x00000000000
                Ending Address: 0x0022FFFFFFF
                Range Size: 8960 MB
                Physical Device Handle: 0x1100
                Memory Array Mapped Address Handle: 0x1300
                Partition Row Position: 1
                Interleave Position: 1
                Interleaved Data Depth: Unknown
Handle 0x1401
        DMI type 20, 19 bytes.
        Memory Device Mapped Address
                Starting Address: 0x00000000000
                Ending Address: 0x000000003FF
                Range Size: 1 kB
                Physical Device Handle: 0x1101
                Memory Array Mapped Address Handle: 0x1300
                Partition Row Position: 1
                Interleave Position: 1
                Interleaved Data Depth: Unknown
Handle 0x1402
        DMI type 20, 19 bytes.
        Memory Device Mapped Address
                Starting Address: 0x00000000000
                Ending Address: 0x0022FFFFFFF
 Range Size: 8960 MB
                Physical Device Handle: 0x1102
                Memory Array Mapped Address Handle: 0x1300
                Partition Row Position: 1
                Interleave Position: 2
                Interleaved Data Depth: Unknown
Handle 0x1403
        DMI type 20, 19 bytes.
        Memory Device Mapped Address
                Starting Address: 0x00000000000
                Ending Address: 0x000000003FF
                Range Size: 1 kB
                Physical Device Handle: 0x1103
                Memory Array Mapped Address Handle: 0x1300
                Partition Row Position: 1
                Interleave Position: 2
                Interleaved Data Depth: Unknown
Handle 0x1404
        DMI type 20, 19 bytes.
        Memory Device Mapped Address
                Starting Address: 0x00000000000
                Ending Address: 0x0022FFFFFFF
                Range Size: 8960 MB
                Physical Device Handle: 0x1104
                Memory Array Mapped Address Handle: 0x1300
                Partition Row Position: 1
                Interleave Position: 1
                Interleaved Data Depth: Unknown
Handle 0x1405
        DMI type 20, 19 bytes.
        Memory Device Mapped Address
                Starting Address: 0x00000000000
                Ending Address: 0x000000003FF
                Range Size: 1 kB
                Physical Device Handle: 0x1105
                Memory Array Mapped Address Handle: 0x1300
                Partition Row Position: 1
                Interleave Position: 1
                Interleaved Data Depth: Unknown
Handle 0x1406
        DMI type 20, 19 bytes.
        Memory Device Mapped Address
                Starting Address: 0x00000000000
 Ending Address: 0x0022FFFFFFF
                Range Size: 8960 MB
                Physical Device Handle: 0x1106
                Memory Array Mapped Address Handle: 0x1300
                Partition Row Position: 1
                Interleave Position: 2
                Interleaved Data Depth: Unknown
Handle 0x1407
        DMI type 20, 19 bytes.
        Memory Device Mapped Address
                Starting Address: 0x00000000000
                Ending Address: 0x000000003FF
                Range Size: 1 kB
                Physical Device Handle: 0x1107
                Memory Array Mapped Address Handle: 0x1300
                Partition Row Position: 1
                Interleave Position: 2
                Interleaved Data Depth: Unknown

---------- Post updated at 04:15 PM ---------- Previous update was at 04:14 PM ----------

Quote:
Originally Posted by codemaniac
Sometimes 32 bit operating systems cannot recognize memory greater than 4 GB .
It depends on the kernel configuration. Out of the box, the 32-bit version of Linux can see about 3.3 GB of RAM.
yes, why is it like this

thank you for your help
# 7  
Old 03-01-2012
Now that you've explained what your system is, a Proliant ProLiant DL360 G5 should actually be able to support 8GB RAM, yes. Most consumer machines from that era would not...

32-bit x86 Linux kernels have different memory models available, configured at compile-time. If you're building your own kernel, inside the 'make menuconfig' menu look for 'high memory support' under 'processor type and features'. select 'off' for most efficient memory use on systems with <=1GB RAM, '4GB' for systems with <=4GB RAM, and 64GB for anything larger.

If you can, look for a precompiled kernel provided by your distribution with 64GB memory support enabled.
 
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