Hello,

> The other 512MB to 756MB bit is used for the Page Tables used to manage
> virtual memory (they are virtual address to physical address translation
> tables used by the CPU H/W).
> After an initial chunk, this is 1/64th of memory.
> This can be seen in LPAR machines because the Hypervisor is managing virtual
> memory to ensure the LPARs can never share the same physical memory (LPARs
> are isolated) abd is seen on one of the HMC machine proprty panels.
> Exactly, the same amount of memory is used when not in LPAR mode - i.e. SMP
> mode or just running on a normal RS/6000 or pSeries machine but you are
> never told how much memory is used by these same Page Tables.
> So yes the 512MB is an overhead you pay for LPAR but the rest is not.

there exists one page table per process, doesnt it?

So, this hypervisor page-table is needed additionally, isnt it?

I am not really sure - but somehow I feel hard to believe that such a
typical os-task like maintening pagetables has been moved completely out
of the os.

Regards,

Holger