Not All Physical Memory is Listed as Available After Enterprise Linux 5 32-bit Installation (Doc ID 468949.1)

Last updated on DECEMBER 09, 2007

Applies to:

Linux Kernel - Version: 5.0
Linux x86

Symptoms

After installing Enterprise linux 5 (OEL5) 32-bit, not all of the physically memory is listed as available i.e.:
For example:

# more messages
kernel:  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
kernel:  BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
kernel:  BIOS-e820: 0000000000100000 - 00000000bf5ffc00 (usable)
kernel:  BIOS-e820: 00000000bf5ffc00 - 00000000bf601c00 (ACPI NVS)
kernel:  BIOS-e820: 00000000bf603c00 - 00000000bf653c00 (reserved)
kernel:  BIOS-e820: 00000000bf653c00 - 00000000bf655c00 (ACPI data)
kernel:  BIOS-e820: 00000000bf655c00 - 00000000c0000000 (reserved)
kernel:  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
kernel:  BIOS-e820: 00000000fec00000 - 00000000fed00400 (reserved)
kernel:  BIOS-e820: 00000000fed20000 - 00000000feda0000 (reserved)
kernel:  BIOS-e820: 00000000fee00000 - 00000000fef00000 (reserved)
kernel:  BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
kernel:  BIOS-e820: 0000000100000000 - 000000013c000000 (usable)
kernel: Warning only 4GB will be used.
kernel: Use a HIGHMEM64G enabled kernel.
...


# cat /proc/meminfo
MemTotal:      3097504 kB
MemFree:         73992 kB
Buffers:        152176 kB
Cached:        2771872 kB
SwapCached:          0 kB
Active:         243520 kB
Inactive:      2708076 kB
HighTotal:     2217980 kB
HighFree:        16228 kB
LowTotal:       879524 kB
...

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