On Wed, Jan 11, 2017 at 11:13:52AM -0600, BharaniKumar Gedela wrote:

HI,

I have a Q about sharing a vcpu across Vm's (cpu alloc ratio 1.0 and HT not enabled)?

I have a Use case where a VM needs vcpu's and one of the vcpu is dedicated to the VM for some traffic processing. We want the other vcpu which is used for control processing and can be shared with a similar VM's control processing. Is this possible and support in openstack/libvirt/KVM?

I can't wrap my head around it, but do you mean something like this: | pCPUs | 0 | 1 | 2 | 3 | |---------------+---+---+---+---| | VM #0's vCPUs | 0 | 1 | 2 | | | VM #1's vCPUs | | 0 | 1 | | where VM #0 uses pCPU 0 exclusively and both VMs share pCPUs 1 and 2? You can do that using vcpupin [1]. Do you want them to share the pCPUs fairly? You could theoretically utilize shares/period/quota for that, making sure that the rest of the system is set up properly as well.

If so could you please advice how to test it?

[1] https://libvirt.org/formatdomain.html#elementsCPUTuning

Regards, Bharani..

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