Hi All, I am using devstack-train version. Can you guys tell me which source file or function should I look when I get mtu size in the network-info but not in the libvirtxml parsed like below log Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: DEBUG nova.network.os_vif_util [None req-31d5b683-9e85-455e-95fd-b110de636fe4 admin admin] Converting VIF {"id": "d0358b23-d96b-4394-969d-32858b60e261", "addre ss": "fa:16:3e:46:97:e0", "network": {"id": "991289bb-6794-4673-b32c-e0f2296a8949", "bridge": "br-int", "label": "shared", "subnets": [{"cidr": "192.168.233.0/24", "dns": [], "gateway": {"address": "192.168.233.1 ", "type": "gateway", "version": 4, "meta": {}}, "ips": [{"address": "192.168.233.237", "type": "fixed", "version": 4, "meta": {}, "floating_ips": []}], "routes": [], "version": 4, "meta": {"dhcp_server": "192.16 8.233.2"}}], "meta": {"injected": false, "tenant_id": "ac158184024043faba836ec3d347d0d7", "mtu": 1450, "physical_network": null, "tunneled": true}}, "type": "ovs", "details": {"connectivity": "l2", "port_filter": true, "ovs_hybrid_plug": false, "datapath_type": "system", "bridge_name": "br-int"}, "devname": "tapd0358b23-d9", "ovs_interfaceid": "d0358b23-d96b-4394-969d-32858b60e261", "qbh_params": null, "qbg_params": null , "active": false, "vnic_type": "normal", "profile": {}, "preserve_on_delete": false, "meta": {}} {{(pid=8579) nova_to_osvif_vif /opt/stack/nova/nova/network/os_vif_util.py:516}} Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: DEBUG nova.network.os_vif_util [None req-31d5b683-9e85-455e-95fd-b110de636fe4 admin admin] Converted object VIFOpenVSwitch(active=False,address=fa:16:3e:46:97: e0,bridge_name='br-int',has_traffic_filtering=True,id=d0358b23-d96b-4394-969d-32858b60e261,network=Network(991289bb-6794-4673-b32c-e0f2296a8949),plugin='ovs',port_profile=VIFPortProfileOpenVSwitch,preserve_on_del ete=False,vif_name='tapd0358b23-d9') {{(pid=8579) nova_to_osvif_vif /opt/stack/nova/nova/network/os_vif_util.py:553}} Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: DEBUG nova.objects.instance [None req-31d5b683-9e85-455e-95fd-b110de636fe4 admin admin] Lazy-loading 'pci_devices' on Instance uuid 997103d3-0a60-4ce2-a85d-c42 eb24cfd8b {{(pid=8579) obj_load_attr /opt/stack/nova/nova/objects/instance.py:1090}} Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: DEBUG nova.virt.libvirt.driver [None req-31d5b683-9e85-455e-95fd-b110de636fe4 admin admin] [instance: 997103d3-0a60-4ce2-a85d-c42eb24cfd8b] End _get_guest_xml xml=<domain type="acrn"> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <uuid>997103d3-0a60-4ce2-a85d-c42eb24cfd8b</uuid> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <name>instance-00000001</name> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <memory>1048576</memory> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <vcpu>1</vcpu> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <metadata> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:instance xmlns:nova="http://openstack.org/xmlns/libvirt/nova/1.0"> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:package version="20.1.2"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:name>cl_acrn</nova:name> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:creationTime>2020-12-04 09:11:22</nova:creationTime> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:flavor name="ds1G"> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:memory>1024</nova:memory> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:disk>10</nova:disk> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:swap>0</nova:swap> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:ephemeral>0</nova:ephemeral> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:vcpus>1</nova:vcpus> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </nova:flavor> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:owner> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:user uuid="b4646b0d513645c8ab6d0656b2e699ed">admin</nova:user> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:project uuid="ac158184024043faba836ec3d347d0d7">admin</nova:project> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </nova:owner> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <nova:root type="image" uuid="b3464729-fdb5-435e-9eff-3525760afa5b"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </nova:instance> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </metadata> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <os> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <type>hvm</type> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <loader>/usr/share/acrn/bios/OVMF.fd</loader> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <boot dev="hd"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </os> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <features> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <acpi/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <apic/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </features> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <clock offset="utc"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <devices> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <disk type="file" device="disk"> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <driver type="raw" cache="none"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <source file="/opt/stack/data/nova/instances/997103d3-0a60-4ce2-a85d-c42eb24cfd8b/disk"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <target dev="vda" bus="virtio"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </disk> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <interface type="bridge"> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <mac address="fa:16:3e:46:97:e0"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <model type="virtio"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <source bridge="br-int"/> --> Why no mtu set in xml Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <target dev="tapd0358b23-d9"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <virtualport type="openvswitch"> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: <parameters interfaceid="d0358b23-d96b-4394-969d-32858b60e261"/> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </virtualport> Dez 04 10:11:22 acrn1-NUC7i7DNHE nova-compute[8579]: </interface> : I checked the solution mentioned in [ https://bugs.launchpad.net/nova/+bug/1747496] and the source code which it said to add is already in my nova code. Anyone have any suggestions? Mit freundlichen Grüßen/ with best regards, Yatindra Shashi IoTG DE- Intel Corporation Munich, Germany Intel Deutschland GmbH Registered Address: Am Campeon 10-12, 85579 Neubiberg, Germany Tel: +49 89 99 8853-0, www.intel.de Managing Directors: Christin Eisenschmid, Gary Kershaw Chairperson of the Supervisory Board: Nicole Lau Registered Office: Munich Commercial Register: Amtsgericht Muenchen HRB 186928