Date: Mon, 19 Jan 2004 14:22:29 -0800
From: Mike Fedyk <mfedyk@matchmail.com>
To: Paolo Ornati <ornati@lycos.it>
Cc: J?rgen Urban <jur@sysgo.com>, linux-kernel@vger.kernel.org
Subject: Re: Lost memory, total memory size is not correct
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	J?rgen Urban <jur@sysgo.com>, linux-kernel@vger.kernel.org
References: <200401191222.23449.jur@sysgo.com> <200401191845.58901.ornati@lycos.it>
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On Mon, Jan 19, 2004 at 06:58:05PM +0100, Paolo Ornati wrote:
> On Monday 19 January 2004 12:22, J?rgen 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".

That's usually just a few KB, but don't forget that MemTotal is what's left
after kernel memory is mapped.
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