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xen-users
RE: [Xen-users] X86_64 and 4GB RAM
> -----Original Message-----
> From: John Hannfield [mailto:hal9020@xxxxxxxxx]
> Sent: 01 May 2007 11:53
> To: Petersson, Mats
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] X86_64 and 4GB RAM
>
> Hi Mats
>
> > What revision of processor do you have, and how large is
> your graphics
> > memory?
>
> The system has 2 dual core Opteron 2210's in it.
Ah, yes that is a Rev F, so it definitely allows memory hoisting.
> cat /proc/cpuinfo
>
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 15
> model : 65
[snip]
>
>
> > If you have a graphics card that eats a fair bit of memory (256 or
> > 512MB) on a processor that doesn't support "memory
> hoisting"[1] (i.e.
>
> It has an onboard graphics card, but I doubt it is high MB, as it is a
> dedicated server. A PenguinComputing Altus 1600
Yeah, onboard graphics usuall use around 16-32MB, so not a whole lot.
>
> > remapping of "behind PCI memory" to a higher address), then
> I wouldn't
> > be surprised if you don't see more than 3.x GB - the reason
> being that
> > the rest of the memory is "behind" the PCI bus devices.
>
> > Also, if you have a newer processor you may need a new BIOS
> to support
> > this, and you'll possibly also need to enable "memory hoisting" (or
> > memory hole or some such) in the BIOS setup.
>
> My BIOS has options for
>
> MemoryHole ReMapping this is "Enabled"
That's the one we need...
> MTRR Mapping this is "Discrete"
> IOMMU Mode set to "256 MB"
> CS Sparing Enable this is "Disabled"
>
> The thing is it boots and shows all 4GB with a vanilla debian
> etch bootup.
> It only has problems when booting in to Xen.
Hmm. Something is certainly going wrong here...
--
Mats
>
> --
>
> John
>
>
>
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