Re: too many holes in address space, memory ignored

From: Scott Long (scottl_at_freebsd.org)
Date: 05/30/04

  • Next message: Bill Paul: "Re: Project Evil APs" 
    Date: Sun, 30 May 2004 12:01:31 -0600
To: Don Bowman <don@sandvine.com>

    Don Bowman wrote:
    > On my 4GB system with PAE disabled, i'm getting these
    > two messages out on boot:
    > 262144K of memory above 4GB ignored
    > Too many holes in the physical address space, giving up
    >
    > I'm assuming the first one is due to the address
    > space needing locations for memory mapped io like
    > PCI, so some ram is wasted.

    Actually, it's the opposite. The northbridge is remapping
    the memory that is normally hidden by the PCI window so that it
    doesn't get wasted.

    > The second... this comes from sys/i386/i386/machdep.c
    > Is there any reason i wouldn't just increase
    > 'vm_paddr_t phys_avail[10];' to a number > 10?
    > (and/or increase PHYSMAP_SIZE?)
    >

    Can't comment on the safety of that, other than to wonder if you have a
    the BIOS set to shadow a bunch of <1MB segments.

    Scott
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