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Kernel help



I have 4GB of RAM and i use 2.6.23.9-85.fc8PAE kernel but still only 3.2GB of RAM is detected.

cat /proc/cpuinfo

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Intel(R) Pentium(R) D CPU 3.00GHz
stepping        : 2
cpu MHz         : 2999.990
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pebs bts sync_rdtsc pni monitor ds_cpl vmx cid cx16 xtpr lahf_lm
bogomips        : 6003.32
clflush size    : 64

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 15
model           : 6
model name      : Intel(R) Pentium(R) D CPU 3.00GHz
stepping        : 2
cpu MHz         : 2999.990
cache size      : 2048 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 6
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc pebs bts sync_rdtsc pni monitor ds_cpl vmx cid cx16 xtpr lahf_lm
bogomips        : 5999.04
clflush size    : 64


cat /proc/meminfo

MemTotal:      3374144 kB
MemFree:       2691220 kB
Buffers:         19144 kB
Cached:         323492 kB
SwapCached:          0 kB
Active:         403472 kB
Inactive:       223384 kB
HighTotal:     2488744 kB
HighFree:      1862628 kB
LowTotal:       885400 kB
LowFree:        828592 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:              76 kB
Writeback:           0 kB
AnonPages:      284216 kB
Mapped:          66556 kB
Slab:            26552 kB
SReclaimable:     8388 kB
SUnreclaim:      18164 kB
PageTables:       5832 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:   1687072 kB
Committed_AS:   781924 kB
VmallocTotal:   116728 kB
VmallocUsed:     45036 kB
VmallocChunk:    61940 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
Hugepagesize:     2048 kB

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