Open Stack

I will be interested to watch this develop.  In PowerVM we already have
shared vs. dedicated processors [1] along with concepts like capped vs.
uncapped, min/max proc units, weights, etc.  But obviously it's all
heavily customized to be PowerVM-specific.  If these concepts made their
way into mainstream Nova, we could hopefully adapt to use them and
remove some tech debt.

[1]
https://github.com/openstack/nova/blob/master/nova/virt/powervm/vm.py#L372-L401

On 05/07/2018 04:55 AM, 倪蔚辰 wrote:
> Hi, all
> 
> I would like to propose a blueprint (not proposed yet), which is related
> to openstack nova. I hope to have some comments by explaining my idea
> through this e-mail. Please contact me if anyone has any comment.
> 
>  
> 
> Background
> 
> Under current OpenStack, vCPUs assigned to each VM can be configured as
> dedicated or shared. In some scenarios, such as deploying Radio Access
> Network VNF, the VM is required to have dedicated vCPUs to insure the
> performance. However, in that case, each VM has a vCPU to do Guest OS
> housekeeping. Usually, this vCPU is not a high performance required vCPU
> and do not take high percentage of dedicated vCPU utilization. There is
> some vCPU resources waste.
> 
>  
> 
> Proposed feature
> 
> I hope to add an extra feature to flavor extra specs. It refers to how
> many dedicated vCPUs and how many shared vCPUs are needed for the VM.
> When VM requires vCPU, OpenStack allocates vCPUs on demands. In the
> background scenario, this idea can save many dedicated vCPUs which take
> Guest OS housekeeping. And the scenario stated above is only one use
> case for the feature. This feature potentially allows user to have more
> flexible VM design to save CPU resource.
> 
>  
> 
> Thanks.
> 
>  
> 
> Weichen
> 
> e-mail: niweichen at chinamobile.com
> 
>  
> 
> 
> 
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