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Kernel Parameter "mem" - meminfo Disparity



List members,

I have a Dell PowerEdge 6850 running Fedora Core 3 with 12 GBytes of RAM. Due to limitations of a PCI card I'm installing, I wish to limit the system memory to just under 4 GBytes using the kernel parameter "mem". When I do this, the machine boots fine and the PCI card operates properly, but "/proc/meminfo" and "free" report 2.6 GBytes of available memory.

Can anyone explain this situation or help me resolve it? If you need anymore information than I have supplied, please request it.

System information:
uname -a
Linux immlx15.imm1 2.6.12-1.1376_FC3smp #1 SMP Fri Aug 26 23:51:16 EDT 2005 x86_64 x86_64 x86_64 GNU/Linux


/proc/cmdline
ro root=LABEL=/ quiet mem=4095M

/proc/meminfo
MemTotal: 2809040 kB
MemFree: 2693600 kB
Buffers: 13308 kB
Cached: 35052 kB
SwapCached: 0 kB
Active: 42056 kB
Inactive: 29236 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 2809040 kB
LowFree: 2693600 kB
SwapTotal: 2096472 kB
SwapFree: 2096472 kB
Dirty: 60 kB
Writeback: 0 kB
Mapped: 28440 kB
Slab: 19728 kB
CommitLimit: 3500992 kB
Committed_AS: 48392 kB
PageTables: 1740 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 275932 kB
VmallocChunk: 34359461883 kB
HugePages_Total: 0
HugePages_Free: 0
Hugepagesize: 2048 kB


free -k
total used free shared buffers cached
Mem: 2809040 115136 2693904 0 13348 35012
-/+ buffers/cache: 66776 2742264
Swap: 2096472 0 2096472


Thank you,

Matthew Roth
InterMedia Marketing Solutions
Software Engineer and Systems Developer


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