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Description: Update the QoS setting in interface Unsuccessfully by update-device Versions: libvirt-3.9.0-2.virtcov.el7.x86_64 qemu-kvm-rhev-2.10.0-6.el7.x86_64 How reproducible: 100% Steps: 1. Prepare a running guest with xml as below. # virsh dumpxml rhel | grep /interface -B11 <interface type='network'> <mac address='52:54:00:90:06:7a'/> <source network='default'/> <model type='virtio'/> <bandwidth> <inbound average='1000' peak='5000' burst='1024'/> <outbound average='128' peak='256' burst='256'/> </bandwidth> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> 2. Check the QoS rules # tc filter show dev vnet0 parent ffff: filter protocol all pref 49152 u32 filter protocol all pref 49152 u32 fh 800: ht divisor 1 filter protocol all pref 49152 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid :1 not_in_hw match 00000000/00000000 at 0 police 0x1 rate 1024Kbit burst 256Kb mtu 64Kb action drop overhead 0b ref 1 bind 1 # tc class show dev vnet0 class htb 1:1 root leaf 2: prio 0 rate 8Mbit ceil 40Mbit burst 1Mb cburst 1600b 3. Update the xml info as below # cat interface.xml <interface type='network'> <mac address='52:54:00:90:06:7a'/> <source network='default'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> # virsh update-device rhel interface.xml Device updated successfully 4. Check QoS setting of interface # virsh dumpxml rhel | grep /interface -B9 <interface type='network'> <mac address='52:54:00:90:06:7a'/> <source network='default' bridge='virbr0'/> <target dev='vnet0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> 5. Check the QoS rules # tc filter show dev vnet0 parent ffff: filter protocol all pref 49152 u32 filter protocol all pref 49152 u32 fh 800: ht divisor 1 filter protocol all pref 49152 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid :1 not_in_hw match 00000000/00000000 at 0 police 0x1 rate 1024Kbit burst 256Kb mtu 64Kb action drop overhead 0b ref 1 bind 1 # tc class show dev vnet0 class htb 1:1 root leaf 2: prio 0 rate 8Mbit ceil 40Mbit burst 1Mb cburst 1600b Expected result: The output should be none # tc filter show dev vnet0 parent ffff: # tc class show dev vnet0 Actual result: As the step5 shows Addtional info: If I delete the interface info and just add the xml to guest xml then start the guest <interface type='network'> <mac address='52:54:00:90:06:7a'/> <source network='default' bridge='virbr0'/> <target dev='vnet0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> Check the QoS rules # tc filter show dev vnet0 parent ffff: # tc class show dev vnet0