Re: [Xen-devel] RE: [Xen-users] Why my system only use 3.3G memory ?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Jul 2005, at 09:58, Petersson, Mats wrote:

> You can work around this by running Xen 3.0, but the Xen 3.0 is yet to 
> be released, so it's not suitable for production environments. It 
> does, however, support both 64-bit and PAE addressing of the memory, 
> depending on the type of processor you have.
> Obviously, even with PAE, you will not be able to use ALL of the 4GB, 
> because some of it will be mapped to the PCI hardware devices. But any 
> "hole" between devices in the PCI map can be mapped in as RAM, so the 
> kernel could possibly use up the gaps in the space with memory from 
> above 4GB, rather than just "loosing" it.
The PAE support isn't fully baked yet anyway. We're waiting on fixed-up 
PAE patches for XenLinux from Gerd Knorr. Should be happening 'real 
soon now'. ;-)
 -- Keir


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