[Xen-users] Hints on Balancing of a System with many HVM DomUs

[Martin Troester <TroyMcClure@xxxxxx>]

Hi,

I am currently doing a performance test of HVM DomUs (32bit Linux) on a 
64bit Dom0. All DomUs use a qcow2 backing file and two ethernet devices. 
When I now stress the I/O for those DomUs I see the processor load in 
Dom0 increase heavily, ultimately causing in the DomUs to be almost 
unusable.  Looking into Dom0, the qemu-dm processes consume lots of CPU 
resources. This behaviour is what I expect - without stub domains, I 
expect Dom0 to be overly utilized, compared to a single DomU.
However, this scenario is without any balancing at all. All DomUs get 1 
VCPU, Dom0 is only limited by memory usage.
Therefore, I would like to kindly ask users here if there exist 
something like a recommendation for this usage scenario, e.g. pinning 
physical CPUs to Dom0, modifying the amount of CPU time for Dom0, ...
What's your opinion here?

Regards,
Martin

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