Re: [Xen-devel] question on balloon driver

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Jonas Appel wrote:

> Hello,
>
> I'm trying to get into the internals of xen and especially the balloon
> driver. During the time I dealt with that, several questions came up:
>
> * Does (and if yes, how) the balloon driver in an guest OS have to be
> activated?
>  
No.  In Linux, it's a normal driver that's loaded and initialized during 
system startup.
> * Does the automatic release of memory from a guest OS to Xen already
> work?
>  
It depends on what you mean by automatic.  I'm not sure anyone has ever 
posted an automated memory balancer.
> * 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)?
>  
It's a design goal, not a limit.  I've heard of folks actually getting 
more than 100 domains going at once (although the domains were not 
full-blown linux instances).
Regards,

Anthony Liguori

> Thanks in advance & regards,
>
> Jonas Appel
>
>
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>  

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