Check the kernel versions. From my understanding, kernel 2.0.x needs the
LILO mem=xxx to see more than 64 meg, but 2.2.x kernels generally see all
the memory. I have a SuSE 6.1 box (SMP w/PPro 200) with 128 meg memory
running 2.2.5-SuSE kernel. It sees the full 128 meg. I have a 2.0.36
kernel running on similar hardware in the backroom, with 256 meg, and I
have to use the mem=256M to make it see all the memory.
On Fri, 16 Jul 1999, Gordan Bobic wrote:
> On Fri, 16 Jul 1999, Pete Walters wrote:
>
> > I read the SMP FAQ, and I couldn't find anything about this, so I thought
> > I'd try here for help. I'm fairly new at this so I'll try my best not to
> > sound like an idiot. =)
> >
> > I just built an SMP box with the following:
> >
> > 2 celeron 300A PPGa
> > 2 MSI slot1 adapters
> > 1 128 MB DIMM
> > SuperMicro P6DBE board
> > ....
> >
> > Here's the probelm - I installed SUSE 6.1 and only 64MB of memory is
> > reported by top and /proc/meminfo. I recompiled the kernel for SMP and
> > both processors and everything else seems to be running correctly, I just
> > can't get it to see all 128MB of memory.
> >
> > Another interesting note - when I upgraded the machine, I took a hard
> > drive that already had SUSE 6.1 installed on it out of an old machine
> > (Pentium 200) to use on my new one. When I booted it up, it seen all 128MB
> > of memory.
>
> I don't think this is an SMP problem at all. Linux will normally only see
> and ause the first 64 MB of RAM. In order to make it see and use more, you
> have to tell it to do so.
>
> You do that by specifying the additional boot parameter to the kernel:
>
> "mem=<YourMemorySize>"
>
> or in this case
>
> mem=128MB
>
> For information on how to pass this parameter, look up your boot loader
> documentation. On LILO, it is usually done by specifying the "append="
> parameter in the relevant section, e.g.
>
> append="mem=128MB"
>
> HTH
>
> Gordan
>
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