Libvirt QoS rate limit for instances's network interfaces doesn't work

[Denis Kostryukov]

Upstream bug: https://bugs.launchpad.net/juniperopenstack/+bug/1367095

Tried to apply QoS rate limits for network interfaces on instances.

Set needed values in flavor metadata, the parameters appear in libvirt XML files, but rate limits aren't applied and the instance can reach up to 2Gbit/sec

Please provide a patch.

- Similar bug: https://bugs.launchpad.net/juniperopenstack/+bug/1367095
- MOS 8.0 with Contrail
- Libvirt packages:

libsys-virt-perl 1.2.1-1
libvirt-bin 1.2.9-9~u14.04+mos5+mos8.0+1
libvirt-clients 1.2.9-9~u14.04+mos5+mos8.0+1
libvirt-daemon 1.2.9-9~u14.04+mos5+mos8.0+1
libvirt-daemon-system 1.2.9-9~u14.04+mos5+mos8.0+1
libvirt0 1.2.9-9~u14.04+mos5+mos8.0+1
python-libvirt 1.2.15-1~u14.04+mos1

/mnt/nova/instances/eff4b218-2ce8-48e0-acbd-0489e158c3ec/libvirt.xml

<interface type="ethernet">
<mac address="02:9e:e6:d5:60:6d"/>
<model type="virtio"/>
<script path=""/>
<target dev="tap9ee6d560-6d"/>
<bandwidth>
<inbound average="12800"/>
<outbound average="12800"/>
</bandwidth>
</interface>

/etc/libvirt/qemu/instance-000013a3.xml

<interface type='ethernet'>
<mac address='02:9e:e6:d5:60:6d'/>
<bandwidth>
<inbound average='12800'/>
<outbound average='12800'/>
</bandwidth>
<script path=''/>
<target dev='tap9ee6d560-6d'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>

/run/libvirt/qemu/instance-000013a3.xml

<interface type='ethernet'>
<mac address='02:9e:e6:d5:60:6d'/>
<bandwidth>
<inbound average='12800'/>
<outbound average='12800'/>
</bandwidth>
<script path=''/>
<target dev='tap9ee6d560-6d'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>

[Roman Podoliaka (rpodolyaka)]

MOS 9.2 and MOS 10.0 come with newer libvirt versions (1.3.1 and 2.1.0) that support QoS on contrail.

[Denis Meltsaykin (dmeltsaykin)]

Our version of libvirt doesn't support network rate-limiting. This is clearly not a bug, but a feature request. Also, MOS7/8 were certified with libvirts of their version, changing this demands re-certification (since libvirt is an essential part of the product).

[Denis Meltsaykin (dmeltsaykin)]

Denis, could did you use this patch by Dmitry Teselkin: https://review.fuel-infra.org/#/c/29707/ ?

[Anton Chevychalov (achevychalov)]

Mark that bug as "Won't Fix" for MOS 7 and MOS 8, because libvirt upgrade too bit to be done over maintenance updates. Call support if you need that patch.