Public bug reported: When specifying "hw:cpu_realtime_mask" in the flavor, LibvirtDriver._get_guest_numa_config() calls hardware.vcpus_realtime_topology() to calculate "vcpus_rt" and "vcpus_em". It then directly uses "vcpus_em" to set the "emulatorpin" cpuset.
The problem is that libvirt expects the "emulatorpin" cpuset to be specified as physical CPUs, not virtual CPUs. This results in unexpected values being used for the emulator pinning. The fix is to convert "vcpus_em" from vCPUs to pCPUs, and assign the pCPUs to the "emulatorpin" cpuset. ** Affects: nova Importance: Undecided Assignee: Chris Friesen (cbf123) Status: New ** Tags: compute libvirt newton-backport-potential ** Description changed: When specifying "hw:cpu_realtime_mask" in the flavor, LibvirtDriver._get_guest_numa_config() calls hardware.vcpus_realtime_topology() to calculate "vcpus_rt" and "vcpus_em". It then directly uses "vcpus_em" to set the "emulatorpin" cpuset. The problem is that libvirt expects the "emulatorpin" cpuset to be specified as physical CPUs, not virtual CPUs. + This results in unexpected values being used for the emulator pinning. + The fix is to convert "vcpus_em" from vCPUs to pCPUs, and assign the pCPUs to the "emulatorpin" cpuset. ** Changed in: nova Assignee: (unassigned) => Chris Friesen (cbf123) -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1654345 Title: realtime emulatorpin should use pcpus, not vcpus Status in OpenStack Compute (nova): New Bug description: When specifying "hw:cpu_realtime_mask" in the flavor, LibvirtDriver._get_guest_numa_config() calls hardware.vcpus_realtime_topology() to calculate "vcpus_rt" and "vcpus_em". It then directly uses "vcpus_em" to set the "emulatorpin" cpuset. The problem is that libvirt expects the "emulatorpin" cpuset to be specified as physical CPUs, not virtual CPUs. This results in unexpected values being used for the emulator pinning. The fix is to convert "vcpus_em" from vCPUs to pCPUs, and assign the pCPUs to the "emulatorpin" cpuset. To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1654345/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp