Xen users - Oct 2008 - Define caps and weights per-VCPU in credit scheduler!

Hi all,

As far as I know in credit scheduler we can only define weights and caps for
each VM, and the scheduler apply these credits to all VCPUs belongs to the
VM (i.e. if we setting a limit in the form of cap it will affect all VCPUs
in the VM).

Considering a scenario that we have heterogeneous cores in the system (fast
and slow cores) and VMs are competing on fast cores.
One policy for fare sharing of fast cores is to share them based on the
number of VCPUs. This may require to define different limits on CPU usage
for each VCPU which is not necessarily same for all VCPUs belong to a VM. In
this scenario does it make sense to have weights and caps in credit
scheduler based on VCPUs instead of VMs?  Is it possible to define different
per-VCPU limits for a single VM without modifying the scheduler code?

Thanks,

--
Vahid Kazempour


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