Re: [Xen-users] "dynamic memory allocation" for windows guests?

["Peter Gansterer" <peter.gansterer@xxxxxxxxxxxxx>]

On 2013-02-10 13:13:51 Mike McClurg wrote:
> On 10/02/13 11:20, Peter Gansterer wrote:
> > Hi again,
> >
> > Are there really no hints about this topic?
> >
> > It would also be useful to definitely know there is no solution
> > for what we are looking for - or even input as to why this wouldn't work.
> > Otherwise we'd think about trying it on our own.
> 
> You should look into the Xen Cloud Platform (XCP) [1], which has a 
> feature called Dynamic Memory Control, or memory ballooning [2]. It 
> requires you to install special PV drivers in your Windows guest. One of 
> these drivers is a ballooning daemon, which allocates a range of memory 
> from the guest OS, and then gives that memory back to Xen, which gives 
> the physical memory backed by that memory region to other guests. See 
> [2], "How do balloon drivers work and what is a memory balloon" for more 
> details.
> 
> Mike
> 
> [1] http://wiki.xen.org/wiki/XCP_Overview
> [2] http://wiki.xen.org/wiki/Dynamic_Memory_Control

Thx for the hint.
I had a look at the docs; but from there it seems this is just an automatic way 
to distribute memory targets when starting or stopping guests. As long as 
guests don't change, memory config stays static.
There is no hint, that memory targets are chosen according to the guests actual 
requirements.

I don't like the idea of seting up an XCP system just to confirm that this is 
not what we're looking for.

Maybe there is an XCP user on the list, who can tell me if DMC dynamically 
changes memory targets according to requirements in the domU (even if no 
machines are started or stopped)?

- peter.

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