[integration tests] Bandwidth is too low Exception on QoS tests

[Georgy Dyuldin]

Test result:

https://mirantis.testrail.com/index.php?/tests/view/6206415

Exception:

Bandwidth is too low: 3512729, limit is 4403200

Trace:

self = <mos_tests.neutron.python_tests.test_qos.TestTraficBetweenComputes object at 0x7fe4ca234cd0>
instances = [<Server: server00>, <Server: server01>]
os_conn = <mos_tests.environment.os_actions.OpenStackActions object at 0x7fe4ca234b10>
clean_port_policy = None, clean_net_policy = None

    @pytest.mark.testrail_id('838310')
    def test_restrictions_on_net_and_vm(self, instances, os_conn,
                                        clean_port_policy, clean_net_policy):
        """Check traffic restriction between vms if there are different
            restrictions in the net and vm

            Scenario:
                1. Create net01, subnet
                2. Create router01, set gateway and add interface to net01
                3. Create new policy: neutron qos-policy-create policy_1
                4. Create new rule:
                    neutron qos-bandwidth-limit-rule-create rule-id policy_1 \
                    --max-kbps 4000 --max-burst-kbps 300
                5. Update net01 with --qos-policy parameter
                6. Boot ubuntu vm1 in net01 on compute-1
                7. Boot ubuntu vm2 in net01 on compute-2
                8. Start iperf between vm1 and vm2
                9. Look on the traffic with nload on vm port on compute-1
                10. Create new policy: neutron qos-policy-create bw-limiter
                11. Create new rule:
                    neutron qos-bandwidth-limit-rule-create rule-id bw-limiter \
                    --max-kbps 3000
                12. Find neutron port for vm1: neutron port-list | grep <vm1 ip>
                13. Update port with new policy:
                    neutron port-update your-port-id --qos-policy bw-limiter
                14. Check in nload that traffic changed properly
                15. Update rule for vm port:
                    neutron qos-bandwidth-limit-rule-update rule-id bw-limiter \
                    --max-kbps 6000
            """
        instance1, instance2 = instances

        # Create policy for net
        policy1 = os_conn.create_qos_policy('policy_1')
        os_conn.neutron.create_bandwidth_limit_rule(policy1['policy']['id'], {
            'bandwidth_limit_rule': {
                'max_kbps': 4000,
                'max_burst_kbps': 300,
            }
        })
        os_conn.neutron.update_network(
            self.net['network']['id'],
            {'network': {'qos_policy_id': policy1['policy']['id']}})

> self.check_iperf_bandwidth(instance1, instance2, (4000 + 300) * 1024)

mos_tests/neutron/python_tests/test_qos.py:438:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <mos_tests.neutron.python_tests.test_qos.TestTraficBetweenComputes object at 0x7fe4ca234cd0>
client = <Server: server00>, server = <Server: server01>, limit = 4403200
ip_type = 'fixed', kwargs = {}, server_ip = '10.0.0.5'
remote = <mos_tests.environment.ssh.SSHClient object at 0x7fe4ca4ac5d0> [10.0.0.4:22]
line = ['20160523050738', '10.0.0.4', '40828', '10.0.0.5', '5002', '3', ...]
bandwidth = 3512729

    def check_iperf_bandwidth(self,
                              client,
                              server,
                              limit,
                              ip_type='fixed',
                              **kwargs):
        server_ip = self.os_conn.get_nova_instance_ips(server)[ip_type]
        with self.os_conn.ssh_to_instance(
                self.env,
                client,
                username='ubuntu',
                vm_keypair=self.instance_keypair) as remote:
            for line in self.get_iperf_result(remote, server_ip, **kwargs):
                bandwidth = int(line[8])
                if bandwidth < 0.8 * limit:
                    raise Exception(
                        'Bandwidth is too low: {0}, limit is {1}'.format(
> bandwidth, limit))
E Exception: Bandwidth is too low: 3512729, limit is 4403200

[Georgy Dyuldin (g-dyuldin)]

Commit to fix it:

https://review.gerrithub.io/#/c/277539/