Re: [Xen-users] xen dom0 32 bits memory is limited to 16GB?

[Rudi Ahlers <Rudi@xxxxxxxxxxx>]

Marco Strullato wrote:
> I don't think so: the linux kernel supports pae and pae can map up to
> 64 GB of ram: read here
> http://en.wikipedia.org/wiki/Physical_Address_Extension
> Moreover, if you build the linux kernel you'll find the same: into
> processor types and features the high memory supports can map to 64
> GB.
>
>
>
> Marco
>
> 2008/4/29 Rudi Ahlers <Rudi@xxxxxxxxxxx>:
>   
> > Marco Strullato wrote:
> >
> >     
> > > Hi all,
> > > I'm reading that xen dom0 32 bits is limited to 16GB of ram (see
> > > http://www.centos.org/modules/newbb/viewtopic.php?topic_id=12690)
> > >
> > > Is it true? How can I remove this limit?
> > >
> > > Thanks
> > >
> > > Marco
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
> > >
> > >
> > >
> > >       
> >  That's a 32bit limit, not an OS limit. The only way around this is to use
> > 64bit a OS :)
> >
> >  --
> >
> >  Kind Regards
> >  Rudi Ahlers
> >  CEO, SoftDux
> >
> >  Web:   http://www.SoftDux.com
> >  Check out my technical blog, http://blog.softdux.com for Linux or other
> > technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting
> > stuff
> >
> >
> >     
Ok, so I answered before I checked the facts :)

This could be related to grub, as per this page: 
https://bugzilla.redhat.com/show_bug.cgi?id=250299#c5

I know I had the same problem when upgrading from 2GB to 4GB RAM. SO, I 
just installed the updated grub rpm, and reinstalled it on the HDD as such:
[root@venus ~]# history | grep grub
 489  vi /etc/grub.conf
 789  vi /boot/grub/menu.lst
 881  history  | grep grub
 903  grub-install /dev/sda
 905  more /boot/grub/menu.lst
 912  rpm -Uvh grub-0.97-14.x86_64.rpm
 913  rpm -e grub-0.97-14.x86_64
 914  rpm -Uvh grub-0.97-14.x86_64.rpm
 915  grub-install /dev/sda


The last 2 (or 4) options are what you're looking for. It updates the 
grub RPM, and then reinstalls grub on the boot partition of /dev/sda



--

Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
Check out my technical blog, http://blog.softdux.com for Linux or other 
technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff


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