physmem config for 16mb DECstation 3100

[Ken A. Nishimura]

In article <1409 at riscy.dec.com> frank at croton.DEC.COM
(Frank Wortner) writes:
>
>In article <5576 at muvms1.bitnet>, mcguffey at muvms1.bitnet
(Michael McGuffey) writes:
>> In the config file, the physmem definition is set at 8, but we have
>> a 16MB machine.  Is this correct?
>
>The physmem parameter is used to size the system page table,
>so it should be greater than or equal to the amount of memory
>actually in your machine.  Other than that, it has
>no effect.  When you have a chance, change physmem, re-config,
>relink and boot a new kernel.
>
>Regards,
>					Frank

When I first installed Ultrix on our 3100, I saw the same thing.
I didn't see any mention of physmem in the RISC manual, though
in the VAX manual, it does what Frank mentions above.  I went
ahead and reconfiged (is this a word ?) with physmem set to
our system size (16MB).  Upon reboot, I got large numbers of
swap errors with our machine crashing about every 18 hours.  I
changed physmem back to 8 and re-installed the kernel and everything
seems to be fine now.  Anyone else out there experience this?

			-ken