> How much RAM can be accessed by the 2.2 kernel ?
960MiB out of box, 1984MiB with patch on ia32. More on SPARC & Alpha.
> What are the upper limits of the ext2fs can access ?
4TiB with 1KiB blocks (default), 16TiB with 4KiB blocks, 32TiB with 8KiB blocks
(not on ia32 -- need 8KiB pages; Alpha for example).
> How are the user processes managed ?
??? What you mean ?
> Is there a limit of accessible memory for each userd id ?
USER id ??? No. PID -- yes, 3GiB with 960MiB limit, 2GiB with 1984MiB limit.
> Is there a limit of open files for a user id ?
1024, more with Cox's patch.
> At least:
> How can I manipulate kernel parameters ?
Some (memory limit, for example) -- with changes in kernel sources only;
some -- via /proc ...
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