> On Tue, Oct 29, 2002 at 07:17:09PM +0200 or thereabouts, Teodor Georgiev
wrote:
> > 4GB I think.
>
> That was pre 2.4 kernel
>
> I am pretty sure it is up to 64 GB now.
>From help, in xconfig:
"CONFIG_NOHIGHMEM:
Linux can use up to 64 Gigabytes of physical memory on x86 systems.
However, the address space of 32-bit x86 processors is only 4
Gigabytes large. That means that, if you have a large amount of
physical memory, not all of it can be "permanently mapped" by the
kernel. The physical memory that's not permanently mapped is called
"high memory".
If you are compiling a kernel which will never run on a machine with
more than 960 megabytes of total physical RAM, answer "off" here (default
choice and suitable for most users). This will result in a "3GB/1GB"
split: 3GB are mapped so that each process sees a 3GB virtual memory
space and the remaining part of the 4GB virtual memory space is used
by the kernel to permanently map as much physical memory as
possible.
If the machine has between 1 and 4 Gigabytes physical RAM, then
answer "4GB" here.
If more than 4 Gigabytes is used then answer "64GB" here."
<snip>
mark
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