Re: [libvirt] [PATCH 06/10] vcpubandwidth: introduce two new libvirt APIs
On Wed, 6 Jul 2011 10:18:05 +0900, Taku Izumi <izumi.taku(a)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