On Wed, 6 Jul 2011 10:18:05 +0900, Taku Izumi <izumi.taku@jp.fujitsu.com> wrote:
Nikunj is correct here. We only need to ensure that the bandwidth is distributed equally between all of the cpus. This can be accomplished internally by creating a cgroup for each vcpu and ensuring that 'cpu.share' is the same for each vcpu cgroup.
When taken together, virsh I/F and domain XML schema are the following:
#virsh schedinfo VM --set cpuperiod=100000 --config #virsh schedinfo VM --set cpuquota=50000 --config
.. <vcpu>4</vcpu> <cputune> <period>100000</period> <quota>50000</quota> </cputune>
When specified above, the qemu driver creates cgroup for each vcpus and specified as follows:
The quota value is divided by the number of vcpus. vcpu#: (quota/period) vcpu0: 12500/100000 vcpu1: 12500/100000 vcpu2: 12500/100000 vcpu3: 12500/100000
I am with you till this point. This is what I was visualizing the interface as, thanks for putting it.
But, these values cannot be confirmed form the domain XML file. Do not understand what do you mean here.
Regards, Nikunj