Re: [Xen-users] Question about memory management of Xen

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Hi Luca,

On Thu, Aug 23, 2007 at 11:25:40AM +0200, Luca Manganelli wrote:
> Mark Williamson wrote:
> >If you have 32-bit, non-PAE Xen then 4GB host ram is supported.
> >For 32-bit PAE Xen it's more - maybe around 16GB, I think?
> >For 64-bit Xen it's more again.
> >  
> So, to have more than 4GB on a 32bit:
> domain0 --> kernel xen with PAE enabled

Kernel and hypervisor need to be PAE-enabled.

> vmX --> these VMs have less than 4GB. Must I install the PAE enabled 
> kernel in them, too?

Yes, PAE hypervisor only supports PAE domU kernels.  PAE domu
kernels are a good idea anyway as they will work with both 64-bit
hypervisor and PAE hypervisor.

> So, a VM can release free memory to system RAM, is it true? On VMWARE 
> it's never released, it only grows.

I don't know the answer to this one, sorry.

Cheers,
Andy

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