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

[Yves-Gaël Chény <yves@xxxxxxxxxxxxxx>]

Hi, 
you have to use a 64bit kernel for dom0.
But you can use 32 bit guest with.

regards 
yves

Le vendredi 17 octobre 2008 à 15:01 +0200, Denis Cardon a écrit :
> 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
> 
> 
> 


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