Re: sparsemem & sparsemem extreme question

Heiko Carstens
2005-10-05T17:46:35Z

> > Anything specific you need to know about the memory layout?
> How sparse is it? How few present pages can be there be in a worst-case
> physical area?

Worst case that is already currently valid is that you can have 1 MB
segments whereever you want in address space.

For instance I just configured a virtual machine that has the following
memory layout:

Address Range
-----------------------------------
0000000000000000 - 00000000000FFFFF
000000FFC0000000 - 000000FFC00FFFFF

Even though it's currently not possible to define memory segments above
1TB, this limit is likely to go away.
In addition if running in a logical partition we always have a small gap
at the 2GB barrier. Not sure how large that gap is, I'll check tomorrow.

Heiko