From: Paolo Ornati <ornati@lycos.it>
To: "Jürgen Urban" <jur@sysgo.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Lost memory, total memory size is not correct
Date: Mon, 19 Jan 2004 18:58:05 +0100 [thread overview]
Message-ID: <200401191845.58901.ornati@lycos.it> (raw)
In-Reply-To: <200401191222.23449.jur@sysgo.com>
On Monday 19 January 2004 12:22, Jürgen Urban wrote:
> Hello,
>
> I tried to get the amount of total physical memory. I looked at
> /proc/meminfo and found this line (2.4.18):
>
> MemTotal: 30844 kB
>
> But this is not correct the system have 32768 kB Memory. I looked at
> kernel sources and I found the variable max_mapnr. Can I use it to detect
> the correct memory size? It seems that it stores the maximum number of
> pages usable. So I can convert it with macro K() in
> linux/fs/proc/proc_misc.c to a value in kB.
There are some addresses that cannot be used on PC because there is
something mapped (for example System ROM...), you can see these regions
doing "cat /proc/iomem".
Here there is my output:
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-07febfff : System RAM
00100000-00298596 : Kernel code
00298597-00322f27 : Kernel data
07fec000-07feefff : ACPI Tables
07fef000-07ffefff : reserved
07fff000-07ffffff : ACPI Non-volatile Storage
de800000-de81ffff : Promise Technology, Inc. 20265
df000000-df0000ff : Cologne Chip Designs GmbH ISDN network controller
[HFC-PCI]
df800000-df8000ff : Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
df800000-df8000ff : 8139too
e0000000-e3dfffff : PCI Bus #01
e0000000-e1ffffff : 3Dfx Interactive, Inc. Voodoo Banshee
e3f00000-e5ffffff : PCI Bus #01
e4000000-e5ffffff : 3Dfx Interactive, Inc. Voodoo Banshee
e6000000-e7ffffff : VIA Technologies, Inc. VT8363/8365 [KT133/KM133]
ffff0000-ffffffff : reserved
Bye
--
Paolo Ornati
Linux v2.4.24
next prev parent reply other threads:[~2004-01-19 17:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-19 11:22 Lost memory, total memory size is not correct Jürgen Urban
2004-01-19 17:58 ` Paolo Ornati [this message]
2004-01-19 22:22 ` Mike Fedyk
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