OpenStack Compute (nova)

  1. Bug #1417667
  2. Comment #0

Comment 0 for bug 1417667

Revision history for this message
Chris Friesen (cbf123) wrote : migration/evacuation/rebuild/resize of instance with dedicated cpus needs to recalculate cpus on destination

I'm running nova trunk, commit 752954a.

I configured a flavor with two vcpus and extra specs "hw:cpu_policy=dedicated" in order to enable vcpu pinning.

I booted up a number of instances such that there was one instance affined to host cpus 12 and 13 on compute-0, and another instance affined to cpus 12 and 13 on compute-2. (As reported by "virsh vcpupin" and "virsh dumpxml".)

I then triggered a live migration of one instance from compute-0 to compute-2. This resulted in both instances being affined to host cpus 12 and 13 on compute-2.

The "hw:cpu_policy=dedicated" extra spec is intended to provide dedicated host cpus for the instance. In order to provide this, on a live migration (or cold migration, or rebuild, or evacuation, or resize, etc.) nova needs to ensure that the instance is affined to host cpus that are not currently being used by other instances.