On Thu, Apr 19, 2007 at 03:32:55PM +0200, Johan Ihren wrote:
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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).

With a 32bits or 64bits OS ? with 32bits, you won't see more than 4GB
including the PCI hole anyway, even if the chipset supports remaming the
remaining RAM above 4GB.

> 
> 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?

NetBSD/Xen is still 32bits, so it's limited to 4GB.

-- 
Manuel Bouyer, LIP6, Universite Paris VI.           Manuel.Bouyer@lip6.fr
     NetBSD: 26 ans d'experience feront toujours la difference
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