Re: Sarge not showing all RAM
On Thu, 2004-12-23 at 18:33, JerryN wrote:
> I have the book. Sorry, but it's about as practically informative as
> these numerous emails.
>
>
>
> On Thu, 2004-12-23 at 18:24 +0100, Peter Robinson wrote:
> > On Thu, 2004-12-23 at 15:15, Jerome BENOIT wrote:
> > > Dave Ewart wrote:
> > > > On Thursday, 23.12.2004 at 13:39 +0000, Jerome BENOIT wrote:
> > > >
> > > >
> > > >>Hello List,
> > > >>
> > > >>I observed a similar behaviour on my Sarge laptop (Inspiron 8200): I
> > > >>have 1GB ram but /proc/mening shows (only) 905136 kB and the Gnome
> > > >>system monitor 884 MB.
> > > >>
> > > >>I have to say that my kernel is not 4GB enabled: so far I thought that
> > > >>1GB was smaller that 4GB.
> > >
> > > In fact, according to the help message provided by the kernel,
> > > 1GB is on the edge: so it is not so clear to me wether the kernel
> > > must be 4GB enabled.
> > >
> > > >
> > > >
> > > > There's something magic about that 905MB line - a 1GB RAM machine of
> > > > ours showed that amount as total RAM when on a non-4GB and non-64GB
> > > > kernel. Don't know why exactly it's 905MB, but that ties up with what I
> > > > saw. It's not sharing with AGP memory, because my system didn't have
> > > > that.
> > > >
> > > > Once upgraded to a 4GB kernel, the full 1GB was visible.
> > > >
> > > > Dave.
> > >
> > > I am rebuilding my kernel with this option.
> > >
> > > We will see,
> > > Jerome
> >
> >
> > There are three memory zones on x86 for linux
> > ZONE_DMA < 16 MB
> > ZONE_NORMAL 16-896 MB
> > ZONE_HIGHMEM > 896 MB
> >
> > related to various hardware limitations. There's some interesting
> > discussions of this in 'Linux Kernel Development' by R. Love.
> > -peter
> >
> >
> >
> --
> JerryN <misnagid@usa.net>
-please don't cc to me, as I read the list
-please don't top post
-if you really want to know, you will need to read the linux kernel
source -- it's all there. The book is a nice jumping off point!
-Peter
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