Re: [Xen-users] Can be installed more than 32 GB RAM on Ubuntu 10.04 64 bit XEN VM?

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Wed, 2015-07-29 at 04:24 -0700, dataworks.biz wrote:
> Does Ubuntu lucid support more than 32 GB of ram?
> I have a XEN server running a PV guest. I upgraded from 32 to 64 GB RAM. 
> The domain0 (host) sees all the RAM and starts the domainU (guest) with 
> all
> the RAM. But inside the guest OS I can only see 32 of 64 GB RAM. I think
> this is a limitation of ubuntu 10.04 because the xentop command give me 
> the
> guest with all the RAM.
> Domain0 (host) specifications : 
> - Ubuntu 12.04.2 LTS 
> - 3.5.0-34-generic kernel 
> - 64 bit 
> - all RAM is addressed
> DomainU (guest) specifications : 
> - Ubuntu 10.04.4 LTS 
> - 2.6.32-40-server kernel 
> - 64 bit 
> - ParaVirtualized
>  - it sees only 32GB of 64 GB RAM.
> There was no problem while upgrading from 16 to 32 GB.
> 
> This is very similar to this old topic:
> http://old-list-archives.xenproject.org/xen-users/2011-06/msg00393.html
> 
> But I guess I already have the newer kernel...

I think your 2.6.32 based domU kernel is old enough that it still has the
old compile time limit, which Ubuntu appears to have set to 32GB.

Ian.



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