Re: [Xen-users] Xen Balooning "Minimum target"

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Denny Schierz wrote:

>  > 'physical' memory the client thinks it has available. So when you
> >  balloon down, the memory becomes free to the Dom0, but from the DomU,
> >  it just looks like it's there but in use.
>
> so that means, that the DomU can't use more than 64M ram of the system?
> I assumed, that he (Dom_U) trys to swap out, if he doesn't have enough
> physical ram.
Yes, if you balloon down to 64M, then the guest will only play in 64M 
of real memory - and will swap/whatever in order to keep going. I 
gather that it's not quite the same as starting it with only 64M as 
some things (like kernel buffers) are sized at boot time according to 
the available memory. So starting with 1024M and ballooning down to 
64M is likely to result in slight differences to starting with 64M in 
the first place.
I'm not expert though !

--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
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