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Re: [libvirt] [PATCH 5/6] qemu: Implement hypervisor's period and quota tunable XML configuration and parsing



At 05/17/2012 01:09 PM, KAMEZAWA Hiroyuki Wrote:
> (2012/05/17 14:07), Wen Congyang wrote:
> 
>> At 05/17/2012 12:46 PM, KAMEZAWA Hiroyuki Wrote:
>>> (2012/05/17 12:54), Wen Congyang wrote:
> 
>>>> So, if we donot limit the hypervisor, the behavior shoule not be
>>>> changed. So we should limit the whole vm. If the hypervisor threads
>>>> are limited, there is no need to limit the whole vm.
>>>>
>>>
>>>
>>> need to tune hypervisor quota to limit vcpu-only quota ?
>>> Sounds strange to me.
>>
>> No, current implemetion is:
>> 1. limit vcpu and hypervisor: vm is not limited
>> 2. limit vcpu only: vm is limited
>> 3. limit hypervisor: vm is not limited
>> 4. vcpu and hypervisor are not limited: vm is not limited.
>>
> 
> 
> In 2.
> 
>    vm               ----- quota_is_limited
>     |- hypervisor   ----- quota is unlimited
>     |- vcpu[0...x]  ----- quota is limited
> 
> Hm...vm is limited. It seems user need to tune vm's quota...can user
> makes vm's quota to be unlimited and limit *only* vpcus as Xen ?

Without this patchset, the vm will be limited if the vcpu is limited.
We cannot know whether the hypervisor is unlimited or the user does not
set it. If the user does not set it, we should not change the behavior.
So I donot find an easy way to limit only vcpus.

Thanks
Wen Cong

> 
> Thanks,
> -Kame
> 
> 
> 
> 


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