Hi, We are upgrading from Jammy to Noble, and need to include the patch https://review.opendev.org/c/openstack/nova/+/967570?tab=comments so VMs could be created on Noble nodes. However, all of our existing VMs that were created without the patch could not be live migrated to Noble, and has latency in live migrating to Jammy WITH the patch. To be clear: Old VMs created on Jammy -> patch applied on Jammy and Noble -> VMs can be live migrated to Jammy now, but with latency (VMs are pingable almost 10 seconds after live migration completed); VMs can not be live migrated directly to Noble nodes. After live migrated to Jammy with latency, we could live migrate the VMs between Jammy nodes, and one-way to Noble nodes, without any latency. Would like to understand it more, is there any way to get rid of the latency issue? I tried to patch nova/virt/libvirt/migration.py to add managed='no' flag when migration is on fly, but it only allows me to live migrate the old VMs directly to Noble nodes, latency still exists. Thanks, Chang