Jason Thorpe <thorpej@nas.nasa.gov> writes:
> On Tue, 04 Aug 1998 18:07:28 -0400 
>  nm <nmanisca@vt.edu> wrote:
> 
>  > This machine has 67108864 bytes of real memory so where did the 16113664
>  > bytes go?
>  > 
>  > I assume that the kernel is using this much memory?
> 
> Some of it is buffer cache (spelled out in kernel messages), some of it
> is overhead of kernel page tables needed to map the various pieces of
> kernel address space.

Also:

* some of it is kernel.

* some of it is "other data structures initialized early" by MD code, such as:

	* callouts
	* sysvshm segment descriptors
	* sysv semaphore and message queue data structures
	* the buffer structures themselves (in addition to the pages
	  of memory that back the buffer cache

* some of it is other data structures initialized early by MI code, such as:

	* vm_page structures.

A megabyte here, a megabyte there...  8-)



cgd