[libvirt] [PATCH 06/10] vcpubandwidth: introduce two new libvirt APIs
Wen Congyang
wency at cn.fujitsu.com
Tue Jul 5 07:06:06 UTC 2011
At 07/04/2011 07:19 PM, Nikunj A. Dadhania Write:
> On Thu, 30 Jun 2011 11:13:18 +0800, Wen Congyang <wency at 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
>
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