Re: [Xen-devel] Xen 3.0 x86 + PAE with > 16 GB RAM?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 6 Jan 2006, at 22:21, Derrik Pates wrote:

> Can this safely be increased? From my reading of the code, it appears
> that it is set as it is because each gigabyte of installed RAM requires
> a megabyte of RAM to be set aside for mapping tables and such. If I 
> just
> increase the value of MACHPHYS_MBYTES to 32 (for example), should Xen
> boot and work happily, just consuming more RAM for its mapping tables?
>
> Please Cc: me with your reply, as I'm not subscribed to this list 
> currently.
The memory layout of Xen is hardcoded in asm-x86/config.h, and also in 
public/arch-x86_32.h. If the addresses of certain critical structures 
are modified appropriately then things should work fine. Of course 
Linux will end up with less kernel virtual address space and hence less 
lowmem.
 -- Keir


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