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Re: [Xen-devel] Poweredge 1850 - 4GB RAM

from [Mark Williamson]

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Subject:	Re: [Xen-devel] Poweredge 1850 - 4GB RAM
From:	Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date:	Fri, 9 Sep 2005 16:11:47 +0100
Cc:	Brian Hays <brian.hays@xxxxxxxxx>
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> Has anyone tried the current stable Xen with a Poweredge 1850 w/ 4GB ram? I
> know that without PAE Xen can't support more than 4GB on a system, but I've
> seen some results posted on the list that sometimes even 4GB will only show
> up as 3.3GB or 3.5GB in Xen. Does anyone know if the full 4GB will show as
> available on the 1850?

It all depends on the hardware.  You'll never get the full 4GB, it's just a 
question of how much your BIOS is wasting.  Some BIOSes use way more machine 
address space than they really need to in order to support memory-mapped IO 
regions.  Some of them are more efficient.

You'll always need PAE enabled to get at all the memory - true whether it's 
Linux or Xen you're running :-(

Cheers,
Mark

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