Re: [Xenomai] memory size

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 06/25/2012 08:23 PM, Lennart Sorensen wrote:
> On Mon, Jun 25, 2012 at 06:51:53PM +0430, ali hagigat wrote:
>> My computer has 3G bytes RAM. I have disabled "high memory", PAE and
>> 64-bit memory and I/O resources for the Xenomai kernel and the memory
>> size is nearly 900M (Why the memory size became smaller than 1G? By
>> disabling those options the size should be still 3G!) :
> 
> Linux supports 900MB ram on x86, unless you have highmem support (which
> supports up to 4GB), or PAE (which supports up to 64GB).
> 
> It has been that way for many many years.
> 

Not exactly, you can increase the kernel-space memory, by decreasing the
user-space applications address space, using CONFIG_VMSPLIT_2G or even
CONFIG_VMSPLIT_1G.

But if your machine is a 64 bits machine, you should probably simply
compile a 64 bits kernel.

But anyway, people elsewhere, know better than we do. See for instance:
http://linux-mm.org/HighMemory

-- 
                                                                Gilles.