missing 700 MB of RAM

From: Andreas Hartmann
Date: Sun Nov 21 2010 - 14:07:03 EST

Hello,

I've got 8 GB RAM installed, but linux reports 7,3 GB. Where is the
missing RAM (700 MB)?

free
total used free shared buffers cached
Mem: 7706580 5271096 2435484 0 79232 3049120
-/+ buffers/cache: 2142744 5563836
Swap: 8393956 0 8393956

The motherboard is a GA-MA78GM-S2H (64bit, AMD) with a on board Radeon
HD 3200 VGA card. The card uses 256 MB of RAM - so 444 MB of RAM are
missing. Where are they gone?


kernel: 2.6.34.7-33-desktop (OpenSuSE 11.3)

dmesg
Linux version 2.6.34.7-33-desktop (geeko@buildhost) (gcc version 4.4.1
[gcc-4_4-branch revision 150839] (SUSE Linux) ) #1 SMP PREEMPT
2010-11-09 20:08:44 +0100
Command line:
root=/dev/disk/by-id/scsi-SATA_WDC_WD5000AACS-_WD-WCAUF1158341-part1
splash=silent quiet nmi_watchdog=0 iommu=noagp,memaper=0 agp=off vga=0x376
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000afde0000 (usable)
BIOS-e820: 00000000afde0000 - 00000000afde3000 (ACPI NVS)
BIOS-e820: 00000000afde3000 - 00000000afdf0000 (ACPI data)
BIOS-e820: 00000000afdf0000 - 00000000afe00000 (reserved)
BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000000230000000 (usable)
NX (Execute Disable) protection: active
DMI 2.4 present.
e820 update range: 0000000000000000 - 0000000000001000 (usable) ==>
(reserved)
e820 remove range: 00000000000a0000 - 0000000000100000 (usable)
No AGP bridge found
last_pfn = 0x230000 max_arch_pfn = 0x400000000
MTRR default type: uncachable
MTRR fixed ranges enabled:
00000-9FFFF write-back
A0000-BFFFF uncachable
C0000-C7FFF write-protect
C8000-FFFFF uncachable
MTRR variable ranges enabled:
0 base 0000000000 mask FF80000000 write-back
1 base 0080000000 mask FFE0000000 write-back
2 base 00A0000000 mask FFF0000000 write-back
3 base 00AFE00000 mask FFFFE00000 uncachable
4 base 0100000000 mask FF00000000 write-back
5 base 0200000000 mask FFE0000000 write-back
6 base 0220000000 mask FFF0000000 write-back
7 disabled
TOM2: 0000000230000000 aka 8960M
x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
e820 update range: 00000000afe00000 - 0000000100000000 (usable) ==>
(reserved)
last_pfn = 0xafde0 max_arch_pfn = 0x400000000
e820 update range: 0000000000001000 - 0000000000010000 (usable) ==>
(reserved)
Scanning 1 areas for low memory corruption
modified physical RAM map:
modified: 0000000000000000 - 0000000000010000 (reserved)
modified: 0000000000010000 - 000000000009f800 (usable)
modified: 000000000009f800 - 00000000000a0000 (reserved)
modified: 00000000000f0000 - 0000000000100000 (reserved)
modified: 0000000000100000 - 00000000afde0000 (usable)
modified: 00000000afde0000 - 00000000afde3000 (ACPI NVS)
modified: 00000000afde3000 - 00000000afdf0000 (ACPI data)
modified: 00000000afdf0000 - 00000000afe00000 (reserved)
modified: 00000000e0000000 - 00000000f0000000 (reserved)
modified: 00000000fec00000 - 0000000100000000 (reserved)
modified: 0000000100000000 - 0000000230000000 (usable)
initial memory mapped : 0 - 20000000
found SMP MP-table at [ffff8800000f5570] f5570
init_memory_mapping: 0000000000000000-00000000afde0000
0000000000 - 00afc00000 page 2M
00afc00000 - 00afde0000 page 4k
kernel direct mapping tables up to afde0000 @ 16000-1b000
init_memory_mapping: 0000000100000000-0000000230000000
0100000000 - 0230000000 page 2M
kernel direct mapping tables up to 230000000 @ 19000-23000
RAMDISK: 37968000 - 37ff0000
ACPI: RSDP 00000000000f6ef0 00014 (v00 GBT )
ACPI: RSDT 00000000afde3000 00038 (v01 GBT GBTUACPI 42302E31 GBTU
01010101)
ACPI: FACP 00000000afde3040 00074 (v01 GBT GBTUACPI 42302E31 GBTU
01010101)
ACPI: DSDT 00000000afde30c0 069CD (v01 GBT GBTUACPI 00001000 MSFT
03000000)
ACPI: FACS 00000000afde0000 00040
ACPI: SSDT 00000000afde9b80 0028A (v01 PTLTD POWERNOW 00000001 LTP
00000001)
ACPI: HPET 00000000afde9e40 00038 (v01 GBT GBTUACPI 42302E31 GBTU
00000098)
ACPI: MCFG 00000000afde9e80 0003C (v01 GBT GBTUACPI 42302E31 GBTU
01010101)
ACPI: APIC 00000000afde9ac0 00084 (v01 GBT GBTUACPI 42302E31 GBTU
01010101)
ACPI: Local APIC address 0xfee00000
Scanning NUMA topology in Northbridge 24
No NUMA configuration found
Faking a node at 0000000000000000-0000000230000000
Initmem setup node 0 0000000000000000-0000000230000000
NODE_DATA [0000000100000000 - 0000000100013fff]
[ffffea0000000000-ffffea0007bfffff] PMD ->
[ffff880100200000-ffff880106dfffff] on node 0
Zone PFN ranges:
DMA 0x00000010 -> 0x00001000
DMA32 0x00001000 -> 0x00100000
Normal 0x00100000 -> 0x00230000
Movable zone start PFN for each node
early_node_map[3] active PFN ranges
0: 0x00000010 -> 0x0000009f
0: 0x00000100 -> 0x000afde0
0: 0x00100000 -> 0x00230000
On node 0 totalpages: 1965423
DMA zone: 56 pages used for memmap
DMA zone: 0 pages reserved
DMA zone: 3927 pages, LIFO batch:0
DMA32 zone: 14280 pages used for memmap
DMA32 zone: 701976 pages, LIFO batch:31
Normal zone: 17024 pages used for memmap
Normal zone: 1228160 pages, LIFO batch:31
Detected use of extended apic ids on hypertransport bus
ACPI: PM-Timer IO Port: 0x4008
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] disabled)
ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] disabled)
ACPI: LAPIC_NMI (acpi_id[0x00] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x03] dfl dfl lint[0x1])
ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 2, version 33, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ9 used by override.
Using ACPI (MADT) for SMP configuration information
ACPI: HPET id: 0x10b9a201 base: 0xfed00000
SMP: Allowing 4 CPUs, 2 hotplug CPUs
nr_irqs_gsi: 24
early_res array is doubled to 64 at [1e000 - 1e7ff]
PM: Registered nosave memory: 000000000009f000 - 00000000000a0000
PM: Registered nosave memory: 00000000000a0000 - 00000000000f0000
PM: Registered nosave memory: 00000000000f0000 - 0000000000100000
PM: Registered nosave memory: 00000000afde0000 - 00000000afde3000
PM: Registered nosave memory: 00000000afde3000 - 00000000afdf0000
PM: Registered nosave memory: 00000000afdf0000 - 00000000afe00000
PM: Registered nosave memory: 00000000afe00000 - 00000000e0000000
PM: Registered nosave memory: 00000000e0000000 - 00000000f0000000
PM: Registered nosave memory: 00000000f0000000 - 00000000fec00000
PM: Registered nosave memory: 00000000fec00000 - 0000000100000000
Allocating PCI resources starting at afe00000 (gap: afe00000:30200000)
Booting paravirtualized kernel on bare hardware
setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:4 nr_node_ids:1
PERCPU: Embedded 28 pages/cpu @ffff880001e00000 s84136 r8192 d22360 u524288
pcpu-alloc: s84136 r8192 d22360 u524288 alloc=1*2097152
pcpu-alloc: [0] 0 1 2 3
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 1934063
Policy zone: Normal
Kernel command line:
root=/dev/disk/by-id/scsi-SATA_WDC_WD5000AACS-_WD-WCAUF1158341-part1
splash=silent quiet nmi_watchdog=0 iommu=noagp,memaper=0 agp=off vga=0x376
bootsplash: silent mode.
PID hash table entries: 4096 (order: 3, 32768 bytes)
Checking aperture...
Node 0: aperture @ 3fe000000 size 32 MB
Aperture beyond 4GB. Ignoring.
Your BIOS doesn't leave a aperture memory hole
Please enable the IOMMU option in the BIOS setup
This costs you 32 MB of RAM
Mapping aperture over 32768 KB of RAM @ 20000000
PM: Registered nosave memory: 0000000020000000 - 0000000022000000
early_res array is doubled to 128 at [1e800 - 1f7ff]
Subtract (58 early reservations)
#1 [0001000000 - 0001d98ad8] TEXT DATA BSS
#2 [0037968000 - 0037ff0000] RAMDISK
#3 [0001d99000 - 0001d990fe] BRK
#4 [00000f5580 - 0000100000] BIOS reserved
#5 [00000f5570 - 00000f5580] MP-table mpf
#6 [000009f800 - 00000f0f00] BIOS reserved
#7 [00000f105c - 00000f5570] BIOS reserved
#8 [00000f0f00 - 00000f105c] MP-table mpc
#9 [0000010000 - 0000012000] TRAMPOLINE
#10 [0000012000 - 0000016000] ACPI WAKEUP
#11 [0000016000 - 0000019000] PGTABLE
#12 [0000019000 - 000001e000] PGTABLE
#13 [0100000000 - 0100014000] NODE_DATA
#14 [0001d99100 - 0001d9a100] BOOTMEM
#15 [0100014000 - 01000145a0] BOOTMEM
#16 [0100015000 - 0100016000] BOOTMEM
#17 [0100016000 - 0100017000] BOOTMEM
#18 [0100200000 - 0106e00000] MEMMAP 0
#19 [0001d9a100 - 0001db2100] BOOTMEM
#20 [0001db2100 - 0001dca100] BOOTMEM
#21 [0001dca100 - 0001de2100] BOOTMEM
#22 [0001de3000 - 0001de4000] BOOTMEM
#23 [0001d98b00 - 0001d98b41] BOOTMEM
#24 [0001d98b80 - 0001d98bc3] BOOTMEM
#25 [0001d98c00 - 0001d98e68] BOOTMEM
#26 [0001d98e80 - 0001d98ee8] BOOTMEM
#27 [0001d98f00 - 0001d98f68] BOOTMEM
#28 [0001d98f80 - 0001d98fe8] BOOTMEM
#29 [0001de2100 - 0001de2168] BOOTMEM
#30 [0001de2180 - 0001de21e8] BOOTMEM
#31 [0001de2200 - 0001de2268] BOOTMEM
#32 [0001de2280 - 0001de22e8] BOOTMEM
#33 [0001de2300 - 0001de2368] BOOTMEM
#34 [0001de2380 - 0001de23e8] BOOTMEM
#35 [0001de2400 - 0001de2468] BOOTMEM
#36 [0001de2480 - 0001de24a0] BOOTMEM
#37 [0001de24c0 - 0001de24e0] BOOTMEM
#38 [0001de2500 - 0001de2590] BOOTMEM
#39 [0001de25c0 - 0001de2650] BOOTMEM
#40 [0001e00000 - 0001e1c000] BOOTMEM
#41 [0001e80000 - 0001e9c000] BOOTMEM
#42 [0001f00000 - 0001f1c000] BOOTMEM
#43 [0001f80000 - 0001f9c000] BOOTMEM
#44 [0001de2680 - 0001de2688] BOOTMEM
#45 [0001de26c0 - 0001de26c8] BOOTMEM
#46 [0001de2700 - 0001de2710] BOOTMEM
#47 [0001de2740 - 0001de2760] BOOTMEM
#48 [0001de2780 - 0001de28b0] BOOTMEM
#49 [0001de28c0 - 0001de2910] BOOTMEM
#50 [0001de2940 - 0001de2990] BOOTMEM
#51 [0001de4000 - 0001dec000] BOOTMEM
#52 [0020000000 - 0022000000] BOOTMEM
#53 [0001de29c0 - 0001de29e0] BOOTMEM
#54 [0001f9c000 - 0005f9c000] BOOTMEM
#55 [0001e1c000 - 0001e3c000] BOOTMEM
#56 [0001e3c000 - 0001e7c000] BOOTMEM
#57 [000001f800 - 0000027800] BOOTMEM
Memory: 7630836k/9175040k available (4763k kernel code, 1313348k absent,
230856k reserved, 6620k data, 900k init)



01:05.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3200
Graphics (prog-if 00 [VGA controller])
Subsystem: Giga-byte Technology GA-MA78GM-S2H Motherboard
Flags: bus master, fast devsel, latency 0, IRQ 18
Memory at d0000000 (32-bit, prefetchable) [size=256M]
I/O ports at ee00 [size=256]
Memory at fdfe0000 (32-bit, non-prefetchable) [size=64K]
Memory at fde00000 (32-bit, non-prefetchable) [size=1M]
Expansion ROM at <unassigned> [disabled]
Capabilities: [50] Power Management version 3
Capabilities: [a0] MSI: Enable- Count=1/1 Maskable- 64bit+
Kernel driver in use: fglrx_pci



Thanks for any hints,
kind regards,
Andreas

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