[openstack-dev] [nova] Extra feature of vCPU allocation on demands
niweichen at chinamobile.com
Mon May 7 09:55:53 UTC 2018
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.
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.
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.
e-mail: niweichen at chinamobile.com
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