#  /bin/virsh domiftune avocado-vt-vm1 vnet15  --inbound 1024000,4096,4194304  --current
error: Unable to set interface parameters
error: internal error: Child process (tc class add dev vnet15 parent 1: classid 1:1 htb rate 1024000kbps ceil 4096kbps burst 4194304kb quantum 87381) unexpected exit status 1: Illegal "burst"
Usage: ... qdisc add ... htb [default N] [r2q N]
                      [direct_qlen P] [offload]
 default  minor id of class to which unclassified packets are sent {0}
 r2q      DRR quantums are computed as rate in Bps/r2q {10}
 debug    string of 16 numbers each 0-3 {0} direct_qlen  Limit of the direct queue {in packets}
 offload  enable hardware offload
... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]
                      [prio P] [slot S] [pslot PS]
                      [ceil R2] [cburst B2] [mtu MTU] [quantum Q]
 rate     rate allocated to this class (class can still borrow)
 burst    max bytes burst which can be accumulated during idle period {computed}
 mpu      minimum packet size used in rate computations
 overhead per-packet size overhead used in rate computations
 linklay  adapting to a linklayer e.g. atm
 ceil     definite upper class rate (no borrows) {rate}
 cburst   burst but for ceil {computed}
 mtu      max packet size we create rate map for {1600}
 prio     priority of leaf; lower are served first {0}
 quantum  how much bytes to serve from leaf at once {use r2q}TC HTB version 3.3

#  /bin/virsh domiftune avocado-vt-vm1 vnet15  --outbound 1024000,4096,4194304  --current
error: Unable to set interface parameters
error: internal error: Child process (tc filter add dev vnet15 parent ffff: protocol all u32 match u32 0 0 police rate 1024000kbps burst 4194304kb mtu 64kb drop flowid :1) unexpected exit status 255: Error: argument "4194304kb" is wrong: buffer 

 #cat if.xml<interface type="network">
  <mac address="52:54:00:96:fd:1b"/>
  <source network="default" portid="531f32c0-bc7d-4785-b79c-739b71caaf57" bridge="virbr0"/>
  <bandwidth>
    <inbound average="429496729600" peak="429496729600" burst="429496729600"/>
  </bandwidth>
  <target dev="vnet15"/>
  <model type="virtio"/>
  <driver queues="2"/>
  <alias name="net0"/>
  <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>

# virsh update-device avocado-vt-vm1 if11.xml
error: Failed to update device from if11.xml
error: numerical overflow: value '429496729600' is too big for 'burst' parameter, maximum is '4194303'