where did my RAM go?

[(=?utf-8?q?=60=60-=5F-=C2=B4=C2=B4?=) -- Fernando]

I have (supposedly) 2x2GiBs DDR2 and 64bits OS.
Still I can only the system map 3.9GiBs.
Where the heck is the last 100MiBs?

uname -a Linux 2.6.27-1-generic #1 SMP Sat Aug 23 23:19:01 UTC 2008 x86_64 GNU/Linux


$ free -tlm
             total       used       free     shared    buffers     cached
Mem:          3960        921       3038          0         23        334
Low:          3960        921       3038
High:            0          0          0
-/+ buffers/cache:        563       3397
Swap:         7632          0       7632
Total:       11592        921      10670
$ free -tlb
             total       used       free     shared    buffers     cached
Mem:    4152569856  966877184 3185692672          0   25059328  351305728
Low:    4152569856  966877184 3185692672
High:            0          0          0
-/+ buffers/cache:  590512128 3562057728
Swap:   8003186688          0 8003186688
Total:  12155756544  966877184 11188879360
$ free -tlg
             total       used       free     shared    buffers     cached
Mem:             3          0          2          0          0          0
Low:             3          0          2
High:            0          0          0
-/+ buffers/cache:          0          3
Swap:            7          0          7
Total:          11          0         10

$ cat /proc/meminfo 
MemTotal:      4055244 kB
MemFree:       2863488 kB
Buffers:         28560 kB
Cached:         474748 kB
SwapCached:          0 kB
Active:         681720 kB
Inactive:       295376 kB
SwapTotal:     7815612 kB
SwapFree:      7815612 kB
Dirty:            1160 kB
Writeback:           0 kB
AnonPages:      473788 kB
Mapped:         106852 kB
Slab:           117252 kB
SReclaimable:    88924 kB
SUnreclaim:      28328 kB
PageTables:      23476 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
WritebackTmp:        0 kB
CommitLimit:   9843232 kB
Committed_AS:   801208 kB
VmallocTotal: 34359738367 kB
VmallocUsed:    316708 kB
VmallocChunk: 34359420923 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
HugePages_Surp:      0
Hugepagesize:     2048 kB
DirectMap4k:     67264 kB
DirectMap2M:   4126720 kB

     *-memory
          description: System Memory
          physical id: 19
          slot: System board or motherboard
          size: 4GiB
        *-bank:0
             description: SODIMM Synchronous
             product: PartNum0
             vendor: Manufacturer0
             physical id: 0
             serial: SerNum0
             slot: DIMM0
             size: 2GiB
             width: 64 bits
        *-bank:1
             description: SODIMM Synchronous
             product: PartNum1
             vendor: Manufacturer1
             physical id: 1
             serial: SerNum1
             slot: DIMM1
             size: 2GiB
             width: 64 bits

11: None 00.0: 10102 Main Memory
  [Created at memory.61]
  Unique ID: rdCR.CxwsZFjVASF
  Hardware Class: memory
  Model: "Main Memory"
  Memory Range: 0x00000000-0xf7832fff (rw)
  Memory Size: 3 GB + 768 MB
  Config Status: cfg=new, avail=yes, need=no, active=unknown

-- 
BUGabundo  :o)
(``-_-´´)	http://LinuxNoDEI.BUGabundo.net
Linux user #443786    GPG key 1024D/A1784EBB
My new micro-blog @ http://BUGabundo.net
ps. My emails tend to sound authority and aggressive. I'm sorry in advance. I'll try to be more assertive as time goes by...
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