Kris Kennaway wrote:

quoted text
>  > Better yet, why not
>> increase both vm.kmem_size and KVA_PAGES to (the equivalent of) 640 MB=
=20
quoted text
>> or 768 MB by default for 7.0?
>=20
> That is answered in the tuning guide.  Tuning KVA_PAGES by default is=20
> not appropriate.

Ok. I'd like to understand what is the relationship between KVA_PAGES=20
and vm.kmem_size. The tuning guide says:

"""By default the kernel receives 1GB of the 4GB of address space=20
available on the i386 architecture, and this is used for all of the=20
kernel address space needs, not just the kmem map. By increasing=20
KVA_PAGES you can allocate a larger proportion of the 4GB address=20
space..."""

and:

"""recompile your kernel with increased KVA_PAGES option, to increase=20
the size of the kernel address space, before vm.kmem_size can be=20
increased beyond 512M"""

What is the other 512 MB of the 1 GB used for?