Re: [Xen-devel] question on balloon driver

[Josh Triplett <josht@xxxxxxxxxx>]

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



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