Re: [libvirt] [PATCH 06/10] vcpubandwidth: introduce two new libvirt APIs
At 07/04/2011 07:19 PM, Nikunj A. Dadhania Write:
On Thu, 30 Jun 2011 11:13:18 +0800, Wen Congyang
<wency(a)cn.fujitsu.com> wrote:
> We want to control bandwidth for each vcpu, so we can not use the
> API virDomainSetSchedulerParameters(). Introduce two new APIs to
> change and query bandwidth for each vcpu.
>
Will we have different cpu bandwidth for different vcpus?
Something like this:
vcpu1: 1000000/250000
vcpu2: 1000000/500000
vcpu3: 1000000/300000
vcpu4: 1000000/400000
IMO, that is not required, we can have a top level bandwitdh for the VM
and then redistribute it among vcpus equally, without user knowing about
it.
Something like this:
VM1(4vcpu) has to be throttled at 1CPU bandwidth using SetSchedParamters.
Internally libvirt splits it equally:
vcpu1: 1000000/250000
vcpu2: 1000000/250000
vcpu3: 1000000/250000
vcpu4: 1000000/250000
So why introduce VCPU level apis?
Adam Litke said IBM's performance team nead to control cpu bandwidth for each
vcpu.
Regards,
Nikunj