[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] Can't see more than 3.5GB of RAM / UEFI / no e820 memory map detected



On 23/08/2012 08:22, Pasi Kärkkäinen wrote:
On Thu, Aug 23, 2012 at 09:06:20AM +0300, Pasi Kärkkäinen wrote:
On Thu, Aug 23, 2012 at 12:48:01AM +0100, Jonathan Tripathy wrote:
Hi Everyone,

CC: Xen-users

I am running Ubuntu 12.04 x86_64. My machine has a supermicro
motherboard X9SCI-LN4F with 32GB of RAM installed. To get Xen, I simply
did apt-get install xen-hypervisor which gives me Ubuntu's 4.1 xen version.

For some reason, Xen can't see any more than about 3.5GB of RAM. I can
confirm this by xentop as well as xm info. I am definately running a
64-bit Dom0 kernel as when I boot into it without Xen, I can see all
32GB of RAM by running "free -m".

Has anybody come across this issue before? For what it's worth, I'm
booting my system using UEFI - could that have something to do with it?

Any help is very much appreciated

Yes, this is UEFI related issue. Can you turn UEFI off?

It looks like you're not running UEFI capable Xen hypervisor.
(Xen 4.2 has UEFI support, and some vendors have backported UEFI support on 
older versions,
for example Suse SLES11SP2 contains UEFI support in Xen 4.1).

Fixed the line above :)
-- Pasi

Thanks, Pasi.

A couple of questions:

I'm guessing xen.efi (from 4.2) just replaces grub??

Also, if I were to apply that patch from superuser (http://serverfault.com/questions/342109/xen-only-sees-512mb-of-system-ram-should-be-8gb-uefi-boot), would have have any bad consequences? I'm very security conscience as the DomUs are untrusted...

Thanks

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.