On Tue, Nov 13, 2001 at 10:47:30PM +0700, Eugene Grosbein wrote:
> > you have enough physical memory. (By default there is about 1GB of
> > kernel address space, so you are unlikely to be running into this
> > limit - I don't think changing kern.vm.kmem.size will help you).
>
> Are you shure? From LINT:
You're right - it is much smaller (I was thinking of something
else). However it is bigger than 12MB on most systems - I think it
will turn out to be 1/3 physical memory or 200MB, whichever is
less.
> It seems DIRHASH is limited with free space in the kernel malloc area.
> It even cannot utilize default 2M of vfs.ufs.dirhash_maxmem when I do not
> increase kern.vm.kmem.size.
>
> So, how can I estimate needed value of kern.vm.kmem.size?
How much ram do you have in the machine? On a 4.4-RC1 machine
with 128MB of ram we don't have any problems getting dirhash
to use almost all of it's 2MB:
vfs.ufs.dirhash_maxmem: 2097152
vfs.ufs.dirhash_mem: 2085797
This is with the devault value for kern.vm.kmem.size. Maybe
you could print the value your system is getting with:
echo print vm_kmem_size | gdb -k /kernel /dev/mem
David.
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