4GB ram showing as 3.15GB (linux)

Hi,

I just requested a server upgrade from 2GB ram to 4GB ram, but the server only appears to be showing 3.15GB

Can somebody help me out?

Thanks

[root@138 ~]# uname -a
Linux 2.6.9-67.ELsmp #1 SMP Fri Nov 16 12:49:06 EST 2007 x86_64 x86_64 x86_64 GNU/Linux

[root@138 ~]# dmesg | grep -i mem
Node 0 MemBase 0000000000000000 Limit 00000000c3ef0000
Bootmem setup node 0 0000000000000000-00000000c3ef0000
HighMem zone: 0 pages, LIFO batch:1
Memory: 3153464k/3210176k available (2126k kernel code, 0k reserved, 1313k data, 212k init)
Total HugeTLB memory allocated, 0
Freeing unused kernel memory: 212k freed
ehci_hcd 0000:00:13.2: irq 185, pci mem ffffff0000006000
ohci_hcd 0000:00:13.0: irq 185, pci mem ffffff000001a000
ohci_hcd 0000:00:13.1: irq 185, pci mem ffffff000001c000

[root@138 ~]# cat /proc/meminfo
MemTotal:      3154052 kB
MemFree:         70344 kB
Buffers:        140844 kB
Cached:        2484296 kB
SwapCached:          0 kB
Active:        2057452 kB
Inactive:       883412 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      3154052 kB
LowFree:         70344 kB
SwapTotal:    10232236 kB
SwapFree:     10232028 kB
Dirty:             716 kB
Writeback:           0 kB
Mapped:         333304 kB
Slab:           113716 kB
CommitLimit:  11809260 kB
Committed_AS:   614016 kB
PageTables:       7644 kB
VmallocTotal: 536870911 kB
VmallocUsed:    267960 kB
VmallocChunk: 536602455 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB


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