4GB memory showed 3GB only

[.:: Awi ::.]

Hi there,

I install fedora core 4, kernel 2.6.14-1 x86_64 on HP A1250N, AMD64 X2 4GB
RAM.
BIOS reported 4 x 1024 MB ram installed, but linux recognize 3GB only.
I read there is 3GB/1GB issue, user/kernel VM, but I don't get it.
My goal is I can utilize all those 4GB for user, instead of 3GB/1GB.

Could somebody help me please.

thanks.

Awi

#uname -a :
Linux xxxxxxxx  2.6.14-1.1656_FC4smp #1 SMP Thu Jan 5 22:26:33 EST 2006
x86_64 x86_64 x86_64 GNU/Linux

#cat /proc/meminfo
MemTotal:      3282476 kB
MemFree:       2882324 kB
Buffers:         29124 kB
Cached:         139960 kB
SwapCached:      11616 kB
Active:         275812 kB
Inactive:        57104 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      3282476 kB
LowFree:       2882324 kB
SwapTotal:     1933304 kB
SwapFree:      1914712 kB
Dirty:             224 kB
Writeback:           0 kB
Mapped:         171100 kB
Slab:            39976 kB
CommitLimit:   3574540 kB
Committed_AS:   480044 kB
PageTables:       6928 kB
VmallocTotal: 34359738367 kB
VmallocUsed:    264140 kB
VmallocChunk: 34359468743 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB
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