Subject: Re: kern/30202: 256 MB of memory missing on 4 GB box
To: None <gnats-bugs@netbsd.org>
From: Jason Thorpe <thorpej@shagadelic.org>
List: netbsd-bugs
Date: 05/11/2005 13:00:01
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