# virsh dumpxml per1 --xpath //interface
<interface type="network">
  <mac address="52:54:00:d4:1c:18"/>
  <source network="default"/>
  <bandwidth>
    <inbound average="10000000000000000" peak="5000" burst="1024"/>
  </bandwidth>
  <model type="virtio"/>
  <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>

# virsh start per1
error: Failed to start domain 'per1'
error: internal error: Child process (/sbin/tc class add dev vnet10 parent 1: classid 1:1 htb rate 10000000000000000kbps ceil 5000kbps burst 1024kb quantum 853333333333333) unexpected exit status 1: Illegal "quantum"
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