I thought this might be of interest to the list. I am only running Xen
on amd64, so I am not sure how intelligently I can help out. Probably
best to CC urs, since I don't imagine he is subscribed to the list.
Regards,
-Roberto
On Wed, Mar 21, 2007 at 07:26:26PM +0100, Urs Thuermann
wrote:> I have two separate questions, actually, concerning Xen and PAE:
>
> Today, I installed Xen on a Pentium4 machine running Debian testing.
> I did
>
> aptitude install xen-linux-system-2.6.18-4-xen-686
>
> which installed besides others the two debian packages
>
> xen-hypervisor-3.0.3-1-i386-pae and linux-image-2.6.18-4-xen-686
>
> The description of the first of these packages says
>
> This version of the hypervisor is built with PAE enabled, in order
> to support systems with more than 4GB of memory. If you have less
> than that you should probably choose the non -pae version.
>
> However, the xen-linux-system-2.6.18-4-xen-686 depends on the -pae
> version and the kernel linux-image-2.6.18-4-xen-686 cannot run with
> the non -pae xen hypervisor. An older version of xen-linux-system
> seems not be available anymore in Debian testing.
>
> Therefore, I run the -pae version now but I wonder how much
> unnecessary overhead and performance impact this might have on my
> system with only 512 MB of RAM. And will there be a version of the
> 2.6.18-4 kernel for Xen but without -pae?
>
>
>
>
> On another system I had Xen installed for quite a while now. It had
> xen-linux-system-2.6.18-3-xen-686 which depends on the non -pae
> hypervisor and kernel found in the packages
>
> xen-hypervisor-3.0.3-1-i386 and xen-linux-system-2.6.18-3-xen-686
>
> Today, I installed additionally xen-linux-system-2.6.18-4-xen-686
> because I thought this has a newer kernel and not being aware this has
> -pae compiled in. The installation also called update-grub which then
> produced 4 boot entries for Xen/Linux, two of which can't boot
> successfully. The 4 entries are
>
> title Xen 3.0.3-1-i386-pae / Debian GNU/Linux, kernel
2.6.18-4-xen-686
> ...
>
> title Xen 3.0.3-1-i386 / Debian GNU/Linux, kernel
2.6.18-4-xen-686
> ...
>
> title Xen 3.0.3-1-i386-pae / Debian GNU/Linux, kernel
2.6.18-3-xen-686
> ...
>
> title Xen 3.0.3-1-i386 / Debian GNU/Linux, kernel
2.6.18-3-xen-686
> ...
>
>
> where the 2nd and the 3rd don't boot because they combine a non-pae
> Xen hypervisor with a pae kernel or vice versa. Even worse, the 2nd
> entry was made the default for some reason.
>
> Couldn't grub somehow recognize this problem and leave out those bad
> combinations which don't boot?
>
>
--
Roberto C. S?nchez
http://people.connexer.com/~roberto
http://www.connexer.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: Digital signature
Url :
http://lists.alioth.debian.org/pipermail/pkg-xen-devel/attachments/20070321/77a465c0/attachment.pgp
