Part Of The Memory Is Not Recognized By OS (Doc ID 745467.1)

Last updated on JUNE 08, 2009

Applies to:

Linux Kernel - Version: 3.8
Linux x86-64

Symptoms

On a Dell PowerEdge 2950 server, 8 dual-rank 2G RAM is installed into 8 DIMMs physically, toally 16G installed. However, only 12G is available in the OS through /proc/meminfo.

meminfo, dmesg and dmidecode shows as below:
/proc/meminfo
--------------
    MemTotal:     12298352 kB
    MemFree:       9681232 kB
    Buffers:        107836 kB
    Cached:        2250404 kB
    SwapCached:          0 kB
    Active:         384628 kB
    Inactive:      2023548 kB
    HighTotal:           0 kB
    HighFree:            0 kB
    LowTotal:     12298352 kB
    LowFree:       9681232 kB
    SwapTotal:    20474792 kB
    SwapFree:     20474792 kB
    Dirty:             156 kB
    Writeback:           0 kB
    Mapped:          73808 kB
    Slab:           176220 kB
    CommitLimit:  26623968 kB
    Committed_AS:   372584 kB
    PageTables:       1280 kB
    VmallocTotal: 536870911 kB
    VmallocUsed:    272512 kB
    VmallocChunk: 536598239 kB
    HugePages_Total:     0
    HugePages_Free:      0
    Hugepagesize:     2048 kB

dmesg segment
--------------
    Linux asregdbdev1.stanford.edu 2.6.9-67.0.0.0.1.ELsmp #1 SMP Sun Nov 18 01:06:10 EST 2007 x86_64
    BIOS-provided physical RAM map:
     BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
     BIOS-e820: 0000000000100000 - 00000000cfb50000 (usable) <-- 3322M
     BIOS-e820: 00000000cfb50000 - 00000000cfb66000 (reserved)
     BIOS-e820: 00000000cfb66000 - 00000000cfb85c00 (ACPI data)
     BIOS-e820: 00000000cfb85c00 - 00000000d0000000 (reserved)
     BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
     BIOS-e820: 00000000fe000000 - 0000000100000000 (reserved)
     BIOS-e820: 0000000100000000 - 0000000330000000 (usable) <-- 8704M

dmidecode segment
--------------
    Handle 0x1000
        DMI type 16, 15 bytes.
        Physical Memory Array
            Location: System Board Or Motherboard
            Use: System Memory
            Error Correction Type: Multi-bit ECC
            Maximum Capacity: 65280 MB
            Error Information Handle: Not Provided
            Number Of Devices: 8
    Handle 0x1100
        DMI type 17, 28 bytes.
        Memory Device
            Array Handle: 0x1000
            Error Information Handle: Not Provided
            Total Width: 72 bits
            Data Width: 64 bits
            Size: 2048 MB
            Form Factor: <OUT OF SPEC>
            Set: 1
            Locator: DIMM1
            Bank Locator: Not Specified
            Type: <OUT OF SPEC>
            Type Detail: Synchronous
            Speed: 667 MHz (1.5 ns)
            Manufacturer: 80AD808980AD
            Serial Number: 6205071F
            Asset Tag: 010816
            Part Number: HYMP525F72CP4N3-Y5
    Handle 0x1101
        DMI type 17, 28 bytes.
        Memory Device
            Array Handle: 0x1000
            Error Information Handle: Not Provided
            Total Width: 72 bits
            Data Width: 64 bits
            Size: 2048 MB
            Form Factor: <OUT OF SPEC>
            Set: 1
            Locator: DIMM2
            Bank Locator: Not Specified
            Type: <OUT OF SPEC>
            Type Detail: Synchronous
            Speed: 667 MHz (1.5 ns)
            Manufacturer: 80AD808980AD
            Serial Number: 62050713
            Asset Tag: 010816
            Part Number: HYMP525F72CP4N3-Y5
    Handle 0x1102
        DMI type 17, 28 bytes.
        Memory Device
            Array Handle: 0x1000
            Error Information Handle: Not Provided
            Total Width: 72 bits
            Data Width: 64 bits
            Size: 2048 MB
            Form Factor: <OUT OF SPEC>
            Set: 2
            Locator: DIMM3
            Bank Locator: Not Specified
            Type: <OUT OF SPEC>
            Type Detail: Synchronous
            Speed: 667 MHz (1.5 ns)
            Manufacturer: 80AD808980AD
            Serial Number: 6205041F
            Asset Tag: 010816
            Part Number: HYMP525F72CP4N3-Y5
    Handle 0x1103
        DMI type 17, 28 bytes.
        Memory Device
            Array Handle: 0x1000
            Error Information Handle: Not Provided
            Total Width: 72 bits
            Data Width: 64 bits
            Size: 2048 MB
            Form Factor: <OUT OF SPEC>
            Set: 2
            Locator: DIMM4
            Bank Locator: Not Specified
            Type: <OUT OF SPEC>
            Type Detail: Synchronous
            Speed: 667 MHz (1.5 ns)
            Manufacturer: 80AD808980AD
            Serial Number: 6205080F
            Asset Tag: 010816
            Part Number: HYMP525F72CP4N3-Y5
    Handle 0x1104
        DMI type 17, 28 bytes.
        Memory Device
            Array Handle: 0x1000
            Error Information Handle: Not Provided
            Total Width: 72 bits
            Data Width: 64 bits
            Size: 2048 MB
            Form Factor: <OUT OF SPEC>
            Set: 3
            Locator: DIMM5
            Bank Locator: Not Specified
            Type: <OUT OF SPEC>
            Type Detail: Synchronous
            Speed: 667 MHz (1.5 ns)
            Manufacturer: 80AD808980AD
            Serial Number: 62050313
            Asset Tag: 010816
            Part Number: HYMP525F72CP4N3-Y5
    Handle 0x1105
        DMI type 17, 28 bytes.
        Memory Device
            Array Handle: 0x1000
            Error Information Handle: Not Provided
            Total Width: 72 bits
            Data Width: 64 bits
            Size: 2048 MB
            Form Factor: <OUT OF SPEC>
            Set: 3
            Locator: DIMM6
            Bank Locator: Not Specified
            Type: <OUT OF SPEC>
            Type Detail: Synchronous
            Speed: 667 MHz (1.5 ns)
            Manufacturer: 80AD808980AD
            Serial Number: 62050619
            Asset Tag: 010816
            Part Number: HYMP525F72CP4N3-Y5
    Handle 0x1106
        DMI type 17, 28 bytes.
        Memory Device
            Array Handle: 0x1000
            Error Information Handle: Not Provided
            Total Width: 72 bits
            Data Width: 64 bits
            Size: 2048 MB
            Form Factor: <OUT OF SPEC>
            Set: 4
            Locator: DIMM7
            Bank Locator: Not Specified
            Type: <OUT OF SPEC>
            Type Detail: Synchronous
            Speed: 667 MHz (1.5 ns)
            Manufacturer: 80AD808980AD
            Serial Number: 62050310
            Asset Tag: 010816
            Part Number: HYMP525F72CP4N3-Y5
    Handle 0x1107
        DMI type 17, 28 bytes.
        Memory Device
            Array Handle: 0x1000
            Error Information Handle: Not Provided
            Total Width: 72 bits
            Data Width: 64 bits
            Size: 2048 MB
            Form Factor: <OUT OF SPEC>
            Set: 4
            Locator: DIMM8
            Bank Locator: Not Specified
            Type: <OUT OF SPEC>
            Type Detail: Synchronous
            Speed: 667 MHz (1.5 ns)
            Manufacturer: 80AD808980AD
            Serial Number: 6205031B
            Asset Tag: 010816
            Part Number: HYMP525F72CP4N3-Y5
    Handle 0x1108
        DMI type 126, 28 bytes.
        Inactive
    Handle 0x1109
        DMI type 126, 28 bytes.
        Inactive
    Handle 0x110A
        DMI type 126, 28 bytes.
        Inactive
    Handle 0x110B
        DMI type 126, 28 bytes.
        Inactive
    Handle 0x1300
        DMI type 19, 15 bytes.
        Memory Array Mapped Address
            Starting Address: 0x00000000000
            Ending Address: 0x000CFFFFFFF
            Range Size: 3328 MB
            Physical Array Handle: 0x1000
            Partition Width: 0
    Handle 0x1301
        DMI type 19, 15 bytes.
        Memory Array Mapped Address
            Starting Address: 0x00100000000
            Ending Address: 0x0032FFFFFFF
            Range Size: 8960 MB
            Physical Array Handle: 0x1000
            Partition Width: 0

Cause

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