Re: [Xen-users] Re: Xen installation

[als@xxxxxxxxxxxxxxx]

On Wed, Sep 07, 2005 at 09:39:55AM +0200, Petersson, Mats wrote:
> > Thanks to all who replied!
> > 
> > I have successfully compiled my own kernels for use with Xen, 
> > now I try to add one virtual machine.. I have a couple of 
> > questions.. First
> > one: my machine has about 224 megs of ram, I have reserved 
> > 128 megs for dom0, and tried to launch domU machine with 96 
> > megs, but memory allocation failed until I lowered amount of 
> > memory for virtual machine to 80 megs (actually, I tried with 
> > 95, 94, 93, 90, then jumped to 80).. Is this normal?
> 
> The Xen kernel itself uses some memory, both directly (about half a meg
> or so), and dynamically allocated (some megabytes, definitely > 4MB).
> You may want to try a binary search between 80 and 90, but my guess is
> that you'll end up closer to 80 than 90. 
> 
> The Dom0 memory is really that, it's memory used for the kernel that is
> loaded as Domain0, not counting memory that the Xen kernel itself needs.

Somewhere in the documentation I found 64 MB as a safe lower limit for
the Dom0 and that's what I use.  SInce my Dom0 isn't doing much besides
providing storage for DomUs and managing them, it copes just fine with
only 64 MB. I did however add 128 MB of swap to it because the Debian
package tools tend to get rather unhappy with less than 50 MB of usable
address space.

Regards,
     Alex.
-- 
"Opportunity is missed by most people because it is dressed in overalls and
 looks like work."                                      -- Thomas A. Edison

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