The idea behind this wiki is to look at the CPU metrics from the baremetal host, the hypervisor and the VM itself to see the if the CPU utilisation metrics reported are consistent across all 3.
Two tests were conducted. One without isolating cpus from the OS and one with isolating CPUs from the OS on the baremetal host and pinning the vCPUs to those isolated cores.
With Isolation
Core 10 and 11 were isolated from the OS using the isolcpus argument to grub command line and using virsh to Pin the vCPUs to those cores:
$ virsh vcpupin test 0 10
$ virsh vcpupin test 1 11
$ virsh vcpupin test
VCPU: CPU Affinity
----------------------------------
0: 10
1: 11
| Host View | VM View | Virt view | ||||
| silpixa00399126/cpu-10/percent-active-2017-03-07 | ubuntu_vm/cpu-0/percent-active-2017-03-07 | 6c33ff2f-40d0-7a45-873b-7f3ead32413b/virt/virt_vcpu-0-2017-03-07 | ||||
| 1488880609.34 | 0 | 1488880609.14 | 0 | 1488880613.37 | 16590000000.00 | |
| 1488880610.34 | 0 | 1488880610.14 | 0 | |||
| 1488880611.34 | 0 | 1488880611.14 | 0 | |||
| 1488880612.34 | 0 | 1488880612.14 | 0 | |||
| 1488880613.34 | 0 | 1488880613.14 | 0.990099 | |||
| 1488880614.34 | 0.990099 | 1488880614.14 | 0 | |||
| 1488880615.34 | 0 | 1488880615.14 | 0 | |||
| 1488880616.34 | 0 | 1488880616.14 | 0 | |||
| 1488880617.34 | 0 | 1488880617.14 | 0 | |||
| 1488880618.34 | 0.990099 | 1488880618.14 | 0.990099 | |||
| 1488880619.34 | 0 | 1488880619.14 | 0 | |||
| 1488880620.34 | 0 | 1488880620.14 | 0 | |||
| 1488880621.34 | 0 | 1488880621.14 | 0 | |||
| 1488880622.34 | 0 | 1488880622.14 | 0 | |||
| 1488880623.34 | 0 | 1488880623.14 | 0 | 1488880623.36 | 16610000000.00 | 0.20 |
| 1488880624.34 | 0 | 1488880624.14 | 0 | |||
| 1488880625.34 | 0 | 1488880625.14 | 0 | |||
| 1488880626.34 | 0 | 1488880626.14 | 0 | |||
| 1488880627.34 | 1 | 1488880627.14 | 0 | |||
| 1488880628.34 | 1.980198 | 1488880628.14 | 0 | |||
| 1488880629.34 | 0 | 1488880629.14 | 0 | |||
| 1488880630.34 | 0 | 1488880630.14 | 0.990099 | |||
| 1488880631.34 | 0 | 1488880631.14 | 0 | |||
| 1488880632.34 | 0 | 1488880632.14 | 0 | |||
| 1488880633.34 | 0 | 1488880633.14 | 0 | 1488880633.36 | 16630000000.00 | 0.20 |
| 1488880634.34 | 0 | 1488880634.14 | 0 | |||
| 1488880635.34 | 0 | 1488880635.14 | 0 | |||
| 1488880636.34 | 0 | 1488880636.14 | 0 | |||
| 1488880637.34 | 0 | 1488880637.14 | 0 | |||
| 1488880638.34 | 1 | 1488880638.14 | 1 | |||
| 1488880639.34 | 1 | 1488880639.14 | 0 | |||
| 1488880640.34 | 0 | 1488880640.14 | 0 | |||
| 1488880641.34 | 0 | 1488880641.14 | 0 | |||
| 1488880642.34 | 0.990099 | 1488880642.14 | 0.990099 | |||
| 1488880643.34 | 0 | 1488880643.14 | 1.980198 | 1488880643.36 | 16660000000.00 | 0.30 |
| 1488880644.34 | 1 | 1488880644.14 | 1.980198 | |||
| 1488880645.34 | 0 | 1488880645.14 | 1.020408 | |||
| 1488880646.34 | 2.970297 | 1488880646.14 | 0 | |||
| 1488880647.34 | 0 | 1488880647.14 | 0 | |||
| 1488880648.34 | 1 | 1488880648.14 | 1.980198 | |||
| 1488880649.34 | 0 | 1488880649.14 | 0 | |||
| 1488880650.34 | 0 | 1488880650.14 | 0 | |||
| 1488880651.34 | 0.990099 | 1488880651.14 | 0 | |||
| 1488880652.34 | 0 | 1488880652.14 | 1 | |||
| 1488880653.34 | 1 | 1488880653.14 | 0 | 1488880653.36 | 16730000000.00 | 0.70 |
| 1488880654.34 | 1 | 1488880654.14 | 2.020202 | |||
| 1488880655.34 | 2.020202 | 1488880655.14 | 0 | |||
| 1488880656.34 | 0.990099 | 1488880656.14 | 0 | |||
| 1488880657.34 | 0 | 1488880657.14 | 0 | |||
| 1488880658.34 | 2 | 1488880658.14 | 1 | |||
| 1488880659.34 | 0 | 1488880659.14 | 0 | |||
| 1488880660.34 | 0 | 1488880660.14 | 0 | |||
| 1488880661.34 | 0 | 1488880661.14 | 0 | |||
| 1488880662.34 | 0 | 1488880662.14 | 0 | |||
| 1488880663.34 | 0 | 1488880663.14 | 0 | 1488880663.36 | 16780000000.00 | 0.50 |
| 1488880664.34 | 0 | 1488880664.14 | 0 | |||
| 1488880665.34 | 0 | 1488880665.14 | 0 | |||
| 1488880666.34 | 0 | 1488880666.14 | 1 | |||
| 1488880667.34 | 1.980198 | 1488880667.14 | 0.990099 | |||
| 1488880668.34 | 1.010101 | 1488880668.14 | 1.010101 | |||
| 1488880669.34 | 0 | 1488880669.14 | 0 | |||
| 1488880670.34 | 0 | 1488880670.14 | 0 | |||
| 1488880671.34 | 0 | 1488880671.14 | 0 | |||
| 1488880672.34 | 3.960396 | 1488880672.14 | 10.89109 | |||
| 1488880673.34 | 7 | 1488880673.14 | 0 | 1488880673.37 | 16910000000.00 | 1.30 |
| 1488880674.34 | 0 | 1488880674.14 | 0 | |||
| 1488880675.34 | 0 | 1488880675.14 | 0 | |||
| 1488880676.34 | 0 | 1488880676.14 | 0.990099 | |||
| 1488880677.34 | 0 | 1488880677.14 | 0 | |||
| 1488880678.34 | 1 | 1488880678.14 | 2 | |||
| 1488880679.34 | 0 | 1488880679.14 | 0 | |||
| 1488880680.34 | 0 | 1488880680.14 | 0 | |||
| 1488880681.34 | 1.960784 | 1488880681.14 | 0 | |||
| 1488880682.34 | 0 | 1488880682.14 | 0 | |||
| 1488880683.34 | 0 | 1488880683.14 | 0 | 1488880683.36 | 16940000000.00 | 0.30 |
| 1488880684.34 | 0 | 1488880684.14 | 0 | |||
| 1488880685.34 | 0 | 1488880685.14 | 0 | |||
| 1488880686.34 | 0 | 1488880686.14 | 0 | |||
| 1488880687.34 | 0 | 1488880687.14 | 0 | |||
| 1488880688.34 | 1 | 1488880688.14 | 1 | |||
| 1488880689.34 | 0 | 1488880689.14 | 0 | |||
| 1488880690.34 | 0 | 1488880690.14 | 0 | |||
| 1488880691.34 | 0 | 1488880691.14 | 0.990099 | |||
| 1488880692.34 | 0.990099 | 1488880692.14 | 0 | |||
| 1488880693.34 | 0 | 1488880693.14 | 1 | 1488880693.36 | 16960000000.00 | 0.20 |
| 1488880694.34 | 0 | 1488880694.14 | 0 | |||
| 1488880695.34 | 0 | 1488880695.14 | 0 | |||
| 1488880696.34 | 0 | 1488880696.14 | 0 | |||
| 1488880697.34 | 0.990099 | 1488880697.14 | 0.990099 | |||
| 1488880698.34 | 0 | 1488880698.14 | 0 | |||
| 1488880699.34 | 0 | 1488880699.14 | 0 | |||
| 1488880700.34 | 0 | 1488880700.14 | 0 | |||
| 1488880701.34 | 0 | 1488880701.14 | 0 | |||
| 1488880702.34 | 0.990099 | 1488880702.14 | 0 | |||
| 1488880703.34 | 0 | 1488880703.14 | 0 | 1488880703.36 | 16970000000.00 | 0.10 |