This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] question on balloon driver

On Tue, 2005-08-02 at 01:48 +0100, Mark Williamson wrote:
> > * Is the limit of 100 Guest OSs (as mentioned on
> > http://en.wikipedia.org/wiki/Xen_%28virtual_machine_monitor%29 ) really
> > hardcoded somewhere or is it more a practical value (or does the limit
> > not exist)?
> You should be able to start several hundred guests before hitting any hard 
> coded limits (e.g. number of event channels  - I'm told there's a plan to 
> remove this restriction).  Before you get to that stage, most systems will 
> run out of hardware oomph to run so many guests *and* still do something 
> useful.  I think Ian started somewhere over 100 guests one time and IIRC he 
> ran out of disk images before hitting any limits :-)

At least on my machine, with current unstable, I cannot create more than
140 *completely empty* domains (just created, no resources assigned);
attempting to create more at that point gives an out-of-memory error
(which I believe is referring to the Xen hypervisor kernel memory).
Perhaps there is some switch I haven't seen which allows increasing the
amount of memory allocated to the Xen kernel?  It would also be nice if
domains had far less overhead until resources were allocated to them.

- Josh Triplett

Xen-devel mailing list