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3GB out of 4GB on RHEL4 U2

Hi All,

I got a Dell Precision Workstation 370 with 4GB
memory, RHEL4 Update 2 and Pentium4 Hyperthreading
turned on. In BIOS I can see total 4GB memory
correctly. But when I booted intoo RHEL, I can only
see 3GB total memory:

[shrek integrin downloads]$ free
             total       used       free     shared   
buffers     cached
Mem:       3113776    1548608    1565168          0   
  35508    1190132
-/+ buffers/cache:     322968    2790808
Swap:      2096472          0    2096472


[shrek integrin downloads]$ cat /proc/meminfo
MemTotal:      3113776 kB
MemFree:       1562912 kB
Buffers:         35672 kB
Cached:        1190488 kB
SwapCached:          0 kB
Active:        1043660 kB
Inactive:       422760 kB
HighTotal:     2226728 kB
HighFree:       758144 kB
LowTotal:       887048 kB
LowFree:        804768 kB
SwapTotal:     2096472 kB
SwapFree:      2096472 kB
Dirty:             160 kB
Writeback:           0 kB
Mapped:         828140 kB
Slab:            36700 kB
Committed_AS:   748784 kB
PageTables:       7708 kB
VmallocTotal:   106488 kB
VmallocUsed:     42084 kB
VmallocChunk:    61940 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

I tried both kernel versions: kernel-smp-2.6.9-22.EL
and kernel-hugemem-2.6.9-22.EL, all of them can only
see 3GB memory.

How to solve this problem so that I can see 4GB total
memory on my system? Thanks a lot!

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