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RE: [Xen-users] Only 3194MB on 64bit Xen


  • To: "Simon Capstick" <simon@xxxxxxxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
  • Date: Thu, 14 Dec 2006 16:20:13 +0100
  • Delivery-date: Thu, 14 Dec 2006 07:24:14 -0800
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AccfjWUfj97qS6AWTJGlrNoD3HzW0QABcZkg
  • Thread-topic: [Xen-users] Only 3194MB on 64bit Xen

 

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Simon Capstick
> Sent: 14 December 2006 14:36
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] Only 3194MB on 64bit Xen
> 
> Hi,
> 
> I've had a look through the list archives and can't find any relevant 
> (64bit) posts.  My 64 bit Xen install is only showing 3194MB of the 
> 4x1GB RAM installed.  The BIOS shows all 4GB on boot. It's an Intel 
> Desktop board (I forget the model and don't currently have physical 
> access) with a hyper threading Pentium 4 CPU.  Any ideas or 
> explanations 
> would be most welcome.
> 
> Thanks,
> 
> Simon
>
Most likely scenario is that your motherboard/chipset/BIOS doesn't
suport "memory hoisting", which is when memory covered by PCI devices is
remapped above 4G - or perhaps you haven't selected that option in the
BIOS?

--
Mats



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