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[Ilia Baikov <2052906@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Hello,
Recently i've found out that linux-htb is hardcoded to QoS section in neutron-agent's code. For a small workloads it's enough but in case there is 200+ interfaces this makes overall performance to suffer due to high irq. I guess we could try to use mqprio in order to balance tc's flows over multiple queues but is it supported scenario for neutron-agent ? I'm really not sure that DPDK able to help in this case.

Conditions:
OpenStack Zed
Openvswitch (vanilla, not a DPDK)
400 interfaces with QoS on each

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2052906

Title:
  OpenVSwitch HTB QoS not efficient for a lot of interfaces

Status in neutron:
  New

Bug description:
  Hello,
  Recently i've found out that linux-htb is hardcoded to QoS section in neutron-agent's code. For a small workloads it's enough but in case there is 200+ interfaces this makes overall performance to suffer due to high irq. I guess we could try to use mqprio in order to balance tc's flows over multiple queues but is it supported scenario for neutron-agent ? I'm really not sure that DPDK able to help in this case.

  Conditions:
  OpenStack Zed
  Openvswitch (vanilla, not a DPDK)
  400 interfaces with QoS on each

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