>] We have a 4GB IBM xSeries 330 (1GHz PIII) and I can't get 4.3-RELEASE to
>] boot on it. I did set NKPT to 64 as suggested by DG about a week ago on
>] this list (this is also the reason I take this to -hackers rather than
>] -questions). Still, I get
>] panic: swap_pager_swap_init: swap_zone=NULL
>] when booting (both the modified kernel and GENERIC behave the same). An
>] identical machine with 1GB works like a champ. Anything else other than
>] NKPT I should set?
>
>Personally, I think NKPT is a red herring. I am running several
>4G machines with the default of 32, and have not had problems
>(any problems will be automatically fixed for you by grow_kernel()).
NKPT is the initial number of kernel page table pages. It has to be large
enough so that all of the initial/bootstrap VM system data structures can be
allocated. pmap_growkernel() doesn't work during this time since the VM
system has not be initialized yet. The data structures can be quite large
and the default of NKPT isn't large enough and a panic will result in the
bootstrap prior to the device initialization. This was the problem in the
first 4G problem report a few days ago, but is apparantly not the problem
in the most recently reported problem.
-DG
David Greenman
Co-founder, The FreeBSD Project - http://www.freebsd.org
President, TeraSolutions, Inc. - http://www.terasolutions.com
Pave the road of life with opportunities.
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