Re: [libvirt] [PATCH 06/10] vcpubandwidth: introduce two new libvirt APIs
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
But, these values cannot be confirmed form the domain
XML file.
Is this what you intend?
--
Taku Izumi <izumi.taku(a)jp.fujitsu.com>