def test_iperf_upper_limit(self, requires_tc):
# Upper limit is not an accurate measure. This is because it converges
# over time and depends on current machine hardware (CPU).
# Hence, it is hard to make hard assertions on it. The test should run
# at least 60 seconds (the longer the better) and the user should
# inspect the computed average rate and optionally the additional
# traffic data that was collected in client.out in order to be
# convinced QOS is working properly.
limit_kbps = 1000 # 1 Mbps (in kbps)
server_ip = '192.0.2.1'
client_ip = '192.0.2.10'
qos_out = {'ul': {'m2': limit_kbps}, 'ls': {'m2': limit_kbps}}
# using a network namespace is essential since otherwise the kernel
# short-circuits the traffic and bypasses the veth devices and the
# classfull qdisc.
with network_namespace(
'server_ns') as ns, bridge_device() as bridge, veth_pair() as (
server_peer,
server_dev,
), veth_pair() as (
client_dev,
client_peer,
):
# iperf server and its veth peer lie in a separate network
# namespace
link_set_netns(server_dev, ns)
bridge.add_port(server_peer)
bridge.add_port(client_peer)
netns_exec(ns, ['ip', 'link', 'set', 'dev', server_dev, 'up'])
Interface.from_existing_dev_name(client_dev).add_ip(
client_ip, 24, IpFamily.IPv4)
netns_exec(
ns,
[
'ip',
'-4',
'addr',
'add',
'dev',
server_dev,
'%s/24' % server_ip,
],
)
qos.configure_outbound(qos_out, client_peer, None)
with running(IperfServer(server_ip, network_ns=ns)):
client = IperfClient(server_ip, client_ip, test_time=60)
client.start()
max_rate = max([
float(interval['streams'][0]['bits_per_second']) // (2**10)
for interval in client.out['intervals']
])
assert 0 < max_rate < limit_kbps * 1.5
def _bridge_device():
with nettestlib.bridge_device() as bridge:
yield bridge.devName
def _bridge_device():
with nettestlib.bridge_device() as bridge:
yield bridge.devName
def bridge0():
with bridge_device() as br:
yield br
def _bridge_device():
with bridge_device() as bridge:
yield bridge
def bridge_dev():
with bridge_device() as dev:
yield dev
def test_detect_device_driver(self):
with bridge_device() as br:
self.assertEqual('bridge', ethtool.driver_name(br.devName))