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authorVratko Polak <vrpolak@cisco.com>2019-09-23 15:00:00 +0200
committerVratko Polak <vrpolak@cisco.com>2019-09-24 10:24:38 +0200
commita1bd29103c1cfcfd9ea24d03b9f81f9029ff5ebd (patch)
treede04ae9c2d7d6208bca59ca592a688ab280bbfba /resources/libraries/python/TrafficGenerator.py
parentff8f6326efe2fccf5117bb1062f95fb07d2c26c9 (diff)
Reconf tests: Fix async measurements
TRex does not zero the server counters. It copies the values to use as reference, and subtracts them when asked for results. But the reference is stored in the client (not the server). And CSIT uses different scripts to start and stop async traffic, which means different clients. This patch introduces a workaround. Async start will return xstats objects to use as reference, and async stop will use the objects to compute the correct results. The xstats objects are stored in TrafficGenerator instance. Sync measurement does not export the counters, to shorten logs. Other improvements: + Make stop_traffic_on_tg return measurement results directly. + Rename --async to --async_start as "async" is reserved in Python 3.7 + Minor pylint, docstring and typo fixes. Change-Id: I5fc56a0763afb7d62cfa7c0651f96b6867de3e15 Signed-off-by: Vratko Polak <vrpolak@cisco.com>
Diffstat (limited to 'resources/libraries/python/TrafficGenerator.py')
-rw-r--r--resources/libraries/python/TrafficGenerator.py44
1 files changed, 36 insertions, 8 deletions
diff --git a/resources/libraries/python/TrafficGenerator.py b/resources/libraries/python/TrafficGenerator.py
index 57ff22424d..fafb2b71e7 100644
--- a/resources/libraries/python/TrafficGenerator.py
+++ b/resources/libraries/python/TrafficGenerator.py
@@ -106,6 +106,7 @@ class TGDropRateSearchImpl(DropRateSearch):
logger.trace("comparing: {los} < {acc} {typ}".format(
los=loss, acc=loss_acceptance, typ=loss_acceptance_type))
return float(loss) <= float(loss_acceptance)
+ return False
def get_latency(self):
"""Returns min/avg/max latency.
@@ -147,6 +148,8 @@ class TrafficGenerator(AbstractMeasurer):
self.frame_size = None
self.traffic_profile = None
self.warmup_time = None
+ # TODO: Rename "xstats" to something opaque, so TRex is not privileged?
+ self._xstats = (None, None)
@property
def node(self):
@@ -402,7 +405,7 @@ class TrafficGenerator(AbstractMeasurer):
raise RuntimeError('pkill t-rex failed')
def _parse_traffic_results(self, stdout):
- """Parse stdout of scripts into fieds of self.
+ """Parse stdout of scripts into fields of self.
Block of code to reuse, by sync start, or stop after async.
TODO: Is the output TG subtype dependent?
@@ -424,20 +427,26 @@ class TrafficGenerator(AbstractMeasurer):
def trex_stl_stop_remote_exec(self, node):
"""Execute script on remote node over ssh to stop running traffic.
- Internal state is updated with results.
+ Internal state is updated with measurement results.
:param node: TRex generator node.
:type node: dict
- :returns: Nothing
:raises RuntimeError: If stop traffic script fails.
"""
# No need to check subtype, we know it is TREX.
ssh = SSH()
ssh.connect(node)
+ x_args = ""
+ for index, value in enumerate(self._xstats):
+ if value is not None:
+ # Nested quoting is fun.
+ value = value.replace("'", "\"")
+ x_args += " --xstat{i}='\"'\"'{v}'\"'\"'".format(
+ i=index, v=value)
(ret, stdout, _) = ssh.exec_command(
- "sh -c '{}/resources/tools/trex/"
- "trex_stateless_stop.py'".format(Constants.REMOTE_FW_DIR))
+ "sh -c '{d}/resources/tools/trex/trex_stateless_stop.py{a}'"\
+ .format(d=Constants.REMOTE_FW_DIR, a=x_args))
if int(ret) != 0:
raise RuntimeError('TRex stateless runtime error')
@@ -450,6 +459,9 @@ class TrafficGenerator(AbstractMeasurer):
rx_port=1):
"""Execute script on remote node over ssh to start traffic.
+ In sync mode, measurement results are stored internally.
+ In async mode, initial data including xstats are stored internally.
+
:param duration: Time expresed in seconds for how long to send traffic.
:param rate: Traffic rate expressed with units (pps, %)
:param frame_size: L2 frame size to send (without padding and IPG).
@@ -498,7 +510,7 @@ class TrafficGenerator(AbstractMeasurer):
frame_size=frame_size, rate=rate, warmup=warmup_time, p_0=p_0,
p_1=p_1)
if async_call:
- command += " --async"
+ command += " --async_start"
if latency:
command += " --latency"
if unidirection:
@@ -513,11 +525,20 @@ class TrafficGenerator(AbstractMeasurer):
elif async_call:
#no result
self._start_time = time.time()
- self._rate = float(rate[:-3]) if "pps" in rate else rate
+ self._rate = float(rate[:-3]) if "pps" in rate else float(rate)
self._received = None
self._sent = None
self._loss = None
self._latency = None
+ xstats = [None, None]
+ index = 0
+ for line in stdout.splitlines():
+ if "Xstats snapshot {i}: ".format(i=index) in line:
+ xstats[index] = line[19:]
+ index += 1
+ if index == 2:
+ break
+ self._xstats = tuple(xstats)
else:
self._parse_traffic_results(stdout)
self._start_time = None
@@ -526,12 +547,14 @@ class TrafficGenerator(AbstractMeasurer):
def stop_traffic_on_tg(self):
"""Stop all traffic on TG.
- :returns: Nothing
+ :returns: Structure containing the result of the measurement.
+ :rtype: ReceiveRateMeasurement
:raises RuntimeError: If TG is not set.
"""
subtype = check_subtype(self._node)
if subtype == NodeSubTypeTG.TREX:
self.trex_stl_stop_remote_exec(self._node)
+ return self.get_measurement_result()
def send_traffic_on_tg(
self, duration, rate, frame_size, traffic_profile, warmup_time=5,
@@ -539,6 +562,11 @@ class TrafficGenerator(AbstractMeasurer):
rx_port=1):
"""Send traffic from all configured interfaces on TG.
+ In async mode, xstats is stored internally,
+ to enable getting correct result when stopping the traffic.
+ In both modes, stdout is returned,
+ but _parse_traffic_results only works in sync output.
+
Note that bidirectional traffic also contains flows
transmitted from rx_port and received in tx_port.
But some tests use asymmetric traffic, so those arguments are relevant.