On May 11, 2005, at 12:50 PM, ctribo@dtcc.edu wrote:

>> Number:         30202
>> Category:       kern
>> Synopsis:       256 MB of memory missing on 4 GB box
>> Confidential:   no
>> Severity:       non-critical
>> Priority:       low
>> Responsible:    kern-bug-people
>> State:          open
>> Class:          sw-bug
>> Submitter-Id:   net
>> Arrival-Date:   Wed May 11 19:50:00 +0000 2005
>> Originator:     Chris Tribo
>> Release:        3.99.3
>> Organization:
>> Environment:
>>
> NetBSD 3.99.3 (GENERIC.MPACPI) #0: Tue May 10 17:22:01 EDT 2005
>         root@mybox:/usr/obj/sys/arch/i386/compile/GENERIC.MPACPI
>
>> Description:
>>
> This machine has 4096 MB of RAM, is a memory region being missed?
>
>
> NetBSD 3.99.3 (GENERIC.MPACPI) #0: Tue May 10 17:22:01 EDT 2005
>         root@mybox:/usr/obj/sys/arch/i386/compile/GENERIC.MPACPI
> total memory = 3839 MB
> avail memory = 3750 MB

This is "normal".  The i386 port currently only supports physical  
addresses up to 0xfffff000.  So, you loose a bit of memory because  
the PCI memory mapped space has to live somewhere below that address,  
as well.

-- thorpej