David G. Lawrence wrote:
...sure about the exakt syntax but I know someone can change the half by half parity towards 1 to 3 inFreeBSD divides the 32bit virtual address space with 1GB for the kernel
XP). I'm not sure whether FreeBSD divides kernel/userland address space this way, I know Linux and
Windows does and on Windows we changed this (not yet on Linux and not yet on our FreeBSD machines
(OS version >5.0, mostly FreeBSD 5.3-R or 5.4-PRERELEASE).
Any help is appreciated.
and 3GB for user processes. This can be changed with some kernel compile-
time constants (primarily KVA_PAGES, however NKPT may also need to be
increased if the kernel address space is increased).
Dear David. Thank you very much. I assumed FreeBSD do the same like Linux, but don't obviously.
I found a lot of tweaking kernel parameters,
KVA_PAGES
VM_KMEM_SIZE_SCALE
VM_KMEM_SIZE_MAX
VM_KMEM_SIZE
The last three are not related to the address space division and you should not change those under normal circumstance.
Reading some comments in sys/kern/kern_malloc.c make be a bit confused, I do not know much about kernel's interna.
It is nice to hear that FreeBSD do a 1/3 division, I expected a 2/2 division like Linux does. So no need for anything changing.
It's a 1:4 ratio.
Sorry, I meant 1GB kernel, 3GB userland or 2GB kernel, 2GB userland, not the divisor or
mathematical ratio, sorry for this unprecise.
Can someone please explain NKPT? I'm simply curious, didn't found a satisfying answer via google, but a lot of source code with this in ...
It's the number of page table pages that are assigned to the kernel
address space. Each page maps 4MB, so 256 (the default) provides for
1GB of kernel virtual address space, leaving 3GB for user space.
Many thanks, that helped a lot!
Oliver
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