4GB Physical. Less than 3GB in Linux.

[Jeff Chua]

I've noticed that with 4GB physical ram, I'm only see 3098000 MB on
the Dell 745, and 3107056MB on the IBM X60s.

I've tested with CONFIG_HIGHMEM4G=y, CONFIG_HIGHMEM64G=y,
CONFIG_X86_PAE=y, but nothing makes any difference.

Tested on Linux 2.6.20, Linux 2.6.21-rc7.

# dmesg
copy_e820_map() start: 0000000000000000 size: 000000000009f000 end:
000000000009f000 type: 1
copy_e820_map() type is E820_RAM
copy_e820_map() start: 000000000009f000 size: 0000000000001000 end:
00000000000a0000 type: 2
copy_e820_map() start: 00000000000dc000 size: 0000000000024000 end:
0000000000100000 type: 2
copy_e820_map() start: 0000000000100000 size: 00000000bf5d0000 end:
00000000bf6d0000 type: 1
copy_e820_map() type is E820_RAM
copy_e820_map() start: 00000000bf6d0000 size: 000000000000f000 end:
00000000bf6df000 type: 3
copy_e820_map() start: 00000000bf6df000 size: 0000000000021000 end:
00000000bf700000 type: 4
copy_e820_map() start: 00000000bf700000 size: 0000000000900000 end:
00000000c0000000 type: 2
copy_e820_map() start: 00000000f0000000 size: 0000000004000000 end:
00000000f4000000 type: 2
copy_e820_map() start: 00000000fec00000 size: 0000000000010000 end:
00000000fec10000 type: 2
copy_e820_map() start: 00000000fed00000 size: 0000000000000400 end:
00000000fed00400 type: 2
copy_e820_map() start: 00000000fed14000 size: 0000000000006000 end:
00000000fed1a000 type: 2
copy_e820_map() start: 00000000fed1c000 size: 0000000000074000 end:
00000000fed90000 type: 2
copy_e820_map() start: 00000000fee00000 size: 0000000000001000 end:
00000000fee01000 type: 2
copy_e820_map() start: 00000000ff800000 size: 0000000000800000 end:
0000000100000000 type: 2
BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
BIOS-e820: 000000000009f000 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000dc000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000bf6d0000 (usable)
BIOS-e820: 00000000bf6d0000 - 00000000bf6df000 (ACPI data)
BIOS-e820: 00000000bf6df000 - 00000000bf700000 (ACPI NVS)
BIOS-e820: 00000000bf700000 - 00000000c0000000 (reserved)
BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved)
BIOS-e820: 00000000fed00000 - 00000000fed00400 (reserved)
BIOS-e820: 00000000fed14000 - 00000000fed1a000 (reserved)
BIOS-e820: 00000000fed1c000 - 00000000fed90000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000ff800000 - 0000000100000000 (reserved)
2166MB HIGHMEM available.
896MB LOWMEM available.

Memory: 3106140k/3136320k available (2225k kernel code, 29072k
reserved, 910k data, 196k init, 2218816k highmem)
virtual kernel memory layout:
   fixmap  : 0xfff50000 - 0xfffff000   ( 700 kB)
   pkmap   : 0xff800000 - 0xffc00000   (4096 kB)
   vmalloc : 0xf8800000 - 0xff7fe000   ( 111 MB)
   lowmem  : 0xc0000000 - 0xf8000000   ( 896 MB)
     .init : 0xc0416000 - 0xc0447000   ( 196 kB)
     .data : 0xc032c513 - 0xc040ff34   ( 910 kB)
     .text : 0xc0100000 - 0xc032c513   (2225 kB)


Thanks,
Jeff.
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