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Re: [Xen-devel] reported memory usage does not match real memory usage

Am Thu, 13 Feb 2020 11:28:29 +0100
schrieb Jan Beulich <jbeulich@xxxxxxxx>:

> On 12.02.2020 15:22, Olaf Hering wrote:
> > With the script below, the formula may look like this:
> > - each vcpu needs 1MB extra memory
> > - each GB of a HVM domU memory needs 8MB extra memory
> > - each HVM domU needs 2MB extra memory  
> ... this is really an implementation details.

That might be true. But it is important to know such detail. Otherwise the 
value of "free_memory" becomes useless because it will be unknown if there are 
enough resources for the domU that is supposed to be started or received.

However, if the value of 'memory=' becomes the real footprint from which 
everything is allocated, future versions of Xen may need more extra memory. The 
domU may see suddenly less memory after migration, which is something 


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