HP-UX base kernel memory allocation on startup

Hello to all,
This may seem a stupid question, but I still can't find a satisfying answer.

I need to know how to estimate the amount of system memory allocated by the HP-UX kernel(11iv2 & 11iv3) at system startup assuming that I have all my kernel tunables at the default value and no applications or databases running on it.

In short, how many of my system memory is in use immediately after boot?

I know that system memory depends mostly on buffer/file caches, inode cache, page size and overheads.

For me it would be helpful to know that, for example, with a system with x cpu and y GB RAM the system memory in use after boot is around z% of the total RAM.

It would be also helpful if some doc exists about this particular argument.

Thank you very much and regards,

Dario