Re: HIGHMEM

[Sean Neakums]

Nagy Tibor <nagyt@xxxxxxxxxx> writes:

> Hi,
>
> I am sorry, I have found your e-mail address in
> ./arch/i386/kernel/setup.c. I have the problem below since a year, and
> there is no solution yet. I guess, the problem is about e820. The
> problem exists in 2.4.x and also in 2.6.1.
>
> We have two Dell Poweredge servers, an older one (PowerEdge 6300) and a
> newer one (PowerEdge 6400). Both servers have 4GB RAM, but the Linux
> kernel uses about 500MB less memory in the newer machine.

I may be talking through my hat, but I think that in this case you
need to select the option for support of 64G highmem.  If I recall,
"4G highmem" refers not to the total amount to the memory, but to the
highest physical address that can be accessed.

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