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Hi Manuel,

On 2 Mar 2006, at 23:13, Manuel Bouyer wrote:

> On Wed, Mar 01, 2006 at 08:45:58PM -0500, Greg Troxel wrote:
>> [...]
>> ----------------------------------------
>> Intel 915 chipset with 4GB RAM
>>
>> BIOS set to limit VGA memory reservation to smallest values
>> need to investigate why 768 is reserved (pci hole?) after xen
>
> Yes, this is the PCI hole. I've got the same issue with a i945.
> Despite the claim that the motherboard "supports" 4Gb and using a  
> EM64T CPU,
> 768M were stolen for PCI. By playing with BIOS options, disabling  
> all unused
> devices I trimmed this down to ~600M.
>
> In order to really use 4GB you need a i955X chipset.

I have an i965 chipset and I also lose 768MB of 4GB to the PCI hole  
(it's sort of ok, at least I was aware of it when deploying this  
machine).

However, my question is what would happen if I add more memory to the  
machine. I.e. if I boost it to 8GB would I still only get 3.25GB for  
Xen or would I get 7.25GB not having to bother about the hole in the  
middle?

Johan

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