WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing o que pode ser ?

Andei olhando meu log de inicializacao para ver se encontrava alguma coisa errada. Achei a seguinte mensagem:

[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 2.6.26-2-686 (Debian 2.6.26-19lenny2) ([email protected]) (gcc version 4.1.3 20080704 (prerelea
se) (Debian 4.1.2-25)) #1 SMP Wed Nov 4 20:45:37 UTC 2009
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
[ 0.000000] BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
[ 0.000000] BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
[ 0.000000] BIOS-e820: 0000000000100000 - 00000000cf6a0000 (usable)
[ 0.000000] BIOS-e820: 00000000cf6a0000 - 00000000cf6ae000 (ACPI data)
[ 0.000000] BIOS-e820: 00000000cf6ae000 - 00000000cf6f0000 (ACPI NVS)
[ 0.000000] BIOS-e820: 00000000cf6f0000 - 00000000cf6fe000 (reserved)
[ 0.000000] BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
[ 0.000000] BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)
[ 0.000000] BIOS-e820: 0000000100000000 - 0000000130000000 (usable)
[ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 1536MB of RAM.
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: at arch/x86/kernel/cpu/mtrr/main.c:706 mtrr_trim_uncached_memory+0x123/0x183()
[ 0.000000] Modules linked in:
[ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.26-2-686 #1
[ 0.000000] [<c01225f3>] warn_on_slowpath+0x40/0x66
[ 0.000000] [<c02b9b2b>] _spin_lock_irqsave+0x16/0x2f
[ 0.000000] [<c02b9bb9>] _spin_unlock_irqrestore+0xd/0x10
[ 0.000000] [<c0122a94>] release_console_sem+0x173/0x18c
[ 0.000000] [<c0122f0b>] vprintk+0x2d2/0x2de
[ 0.000000] [<c010cef1>] generic_get_mtrr+0x2e/0x11e
[ 0.000000] [<c0122f2b>] printk+0x14/0x18
[ 0.000000] [<c0387376>] mtrr_trim_uncached_memory+0x123/0x183
[ 0.000000] [<c03875e2>] mtrr_bp_init+0x20c/0x214
[ 0.000000] [<c0385060>] setup_arch+0x254/0x6bb
[ 0.000000] [<c0122f2b>] printk+0x14/0x18
[ 0.000000] [<c037f5e4>] start_kernel+0x62/0x2d7

Me chamou atencao :
[ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 1536MB of RAM.
[ 0.000000] ------------[ cut here ]------------

Alguém sabe o que significa e porque ocorre ? Tenho 4Gb de ram nessa maquina, pelo que entendi ele me fala que perdi 1536mb .. ainda nao instalei o bigkernel, porque formatei o servidor a pouco tempo novamente. Será isso ?