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SubjectRe: i686 SMP systems with more then 12 GB ram with 2.4.x kernel ?
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> 16GB ram, 269,424kB reserved
> 32GB ram, 532,080kB reserved, usable low mem: 352 MB
> 64GB ram ??

64Gb basically you can forget

> Which function does the reserved memory fulfill ?
> Is it all for paging ?

A lot of it is the page structs (64bytes per page - which really should be
nearer the 32 some rival Unix OS's achieve on x86)
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