Panic: attempted pmap_enter on 2MB page
Alan Cox
alc at rice.edu
Thu Oct 7 04:46:20 UTC 2010
Dave Hayes wrote:
> Alan Cox <alc at rice.edu> writes:
>
>> When you build your kernel for this ISO are you increasing the value of
>> NKPT?
>>
>
> No. I was under the impression that this value auto-tunes on amd64,
> is that correct?
>
After initialization, yes. However, the kernel starts out with just
NKPT page table pages. With a 600MB MFS root in your kernel, the
default setting for NKPT won't provide enough page table pages to map
your entire kernel during initialization.
Try setting NKPT to 320, and let me know if the strange crashes go away.
Alan
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