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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 jp fujitsu com>


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