OK I have confirmed below is the output from "free" before and after
recompiling with the high mem option for the kernel on Debian.  I did
not add any additional memory to this system I just recompiled the
kernel; talk about free memory.  I gainaed about 100 megs of memory by
just recompiled with HIGH-MEM turned on and I configured it for 4 gigs. 




Before recompile with high mem turned off
 free
             total       used       free     shared    buffers    
cached
Mem:        903688     860508      43180          0      91352    
658556
-/+ buffers/cache:     110600     793088
Swap:      2032212          0    2032212

After with high mem turned on to 4 gigs.

free
             total       used       free     shared    buffers    
cached
Mem:       1032120      52632     979488          0       2424     
17136
-/+ buffers/cache:      33072     999048
Swap:      2032212          0    2032212


Thanks everyone that is great.    


Jim




On Thu, 2004-06-03 at 18:51, Jay Jacobson wrote:
> Bryce is right on. The HIGHMEM option is not in the kernel, thus it will
> only see 896MB of physical RAM. You will need to recompile the kernel with
> this enabled. From 'make menuconfig', see the "Processor type and features
> -> HIGHMEM I/O support" stuff.
> 
> ~Jay
> 
> ..
> ..  Jay Jacobson
> ..  Edgeos, Inc. - 480.961.5996 - http://www.edgeos.com
> ..
> ..  Network Security Auditing and
> ..  Vulnerability Assessment Managed Services
> ..
> 
> 
> 
> On Thu, 3 Jun 2004, Bryce C wrote:
> 
> > More than likely, I think the kernel doesn't support 1Gb+ of memory.
> > Don't know about debian specifically, but distros like mandrake package
> > separate kernels for higher limits, or you can compile your own kernel
> > (not for novices).
> >
> > On Thu, 2004-06-03 at 16:28, elemint@theriver.com wrote:
> > > So the system does not just detect the new amount of memory?
> > >
> > > I use grub, but I will look for an option like that.
> > >
> > >
> > >
> > > jim
> > >
> > >
> > > > There is an option that needs to be fed to Lilo that shows the amount of
> > > > RAM
> > > > that a system has
> > > >
> > > > something like
> > > > append=Mem=1536M
> > > >
> > > >> I added some memory to a Dell server running debian and the bios
> > > >> reported
> > > >> that it detected more memory during the next bootup but when I did a
> > > >> free
> > > >> It does not seem to report more memory, there is a more that normal that
> > > >> is free but not 512 mb free.
> > > >>
> > > >> I went from 1 gig to 1.5 gigs of memory, not sure if Debian sees it this
> > > >> way.
> > > >>
> > > >>
> > > >>              total       used       free     shared    buffers
> > > >> cached
> > > >> Mem:        903688     817132      86556          0     134824
> > > >> 322400
> > > >> -/+ buffers/cache:     359908     543780
> > > >> Swap:      2032212          0    2032212
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