Re: [Xen-users] Q: swap and where?

[Christian Horn <chorn@xxxxxxxxxxxx>]

On Sat, Oct 21, 2006 at 04:32:22AM +0100, Mark Williamson wrote:
> 
> Virtual machines under Xen get a real allocation of physical memory, they're 
> not paged by either dom0 or Xen itself.  This avoids a few potential issues 
> (e.g. "double paging") and makes the implementation simpler.
> 
> The argument that goes along with this is that the domUs themselves are best 
> placed to understand which bits should be swapped out, so they should be in 
> charge of swapping their own stuff.  As a result of this, they all need to 
> have swap partitions.

OTOH it could be nice to do this.
As $software-vendor says 'i support my application on servers with
20GB swap' and you can work around this with sparse-files, its nice
to have vm-memory swapped out on dom0.

vmware supports this, would be nice to know how often it is used.


Christian

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