I've seen a kernel config option to allow a 3GB-user / 1GB-kernel split, even on
normal hardware, so you should definitely be able to reach 3GB on any CPU type.
As for the 36-bit address extension, I haven't tried it but the following
.config entries look relevant:
# CONFIG_HIGHMEM4G is not set
> Actually it's a lie. I've got a dual Pent III with 4Gb RAM. You cannot
have
> a single process that uses more than 2Gb of RAM with any of the Linux 2.4
kernels.
> We hadda install Solaris on the box to do what we wanted to.
how did you get more than 2GB of address space in usermode in a single
Steinar H. Gunderson wrote:
>
> Actually, in newer Linux kernels (ie. at least all 2.4.x versions that I can
> remember) you can expand this further, up to 64GB on CPUs that support it
> (which is, AFAIK, Pentium Pro and newer, so in reality it won't be a
> problem). I don't really know what it do
