[Xen-users] 16G RAM limit with Xen 32bit PAE

[Denis Cardon <denis.cardon@xxxxxxxxxxxxxxxxxxxxxx>]

Hi everyone,

About one year ago there was a thread about a limit of 16GB RAM with the 
32bit PAE xen hypervisor (like mention in the excerpt and link below). I 
wanted to know if that limitation is still valid in upstream version or 
if it has been patched.
I'm currently running on a debian etch with xen from backports and only 
16G out of 24G are seen by the kernel (at boot the bios does see the 
whole 24G). Seems like migration to 64bit is required, but I wanted to 
check first if there wasn't any other options...
Cheers,

Denis

> From:      "Jason Douglas"
> Subject:   Re: [Xen-users] Xen pae and 32G memory
>I am 99% sure that the 32 (PAE) xen hypervisor has a hard-coded limit 
of 16 GB
>of RAM.  To be clear, that's a theoretical limit (much like 32 non-pae 
has a
>4GB limit) so you'll never get the full 16 GB even.  The only way to 
get access
>to all 32 GB is to run the 64-bit hypervisor.  Hope that helps.


http://lists.xensource.com/archives/html/xen-users/2008-01/msg00988.html



--
Denis Cardon
Tranquil IT Systems
44 bvd des pas enchantés
44230 Saint Sébastien sur Loire
tel : +33 (0) 2.40.97.57.56
http://www.tranquil-it-systems.fr



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