1 # Copyright (c) 2020 Cisco and/or its affiliates.
2 # Licensed under the Apache License, Version 2.0 (the "License");
3 # you may not use this file except in compliance with the License.
4 # You may obtain a copy of the License at:
6 # http://www.apache.org/licenses/LICENSE-2.0
8 # Unless required by applicable law or agreed to in writing, software
9 # distributed under the License is distributed on an "AS IS" BASIS,
10 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 # See the License for the specific language governing permissions and
12 # limitations under the License.
14 """Performance testing traffic generator library."""
18 from robot.api import logger
19 from robot.libraries.BuiltIn import BuiltIn
21 from .Constants import Constants
22 from .CpuUtils import CpuUtils
23 from .DropRateSearch import DropRateSearch
24 from .MLRsearch.AbstractMeasurer import AbstractMeasurer
25 from .MLRsearch.MultipleLossRatioSearch import MultipleLossRatioSearch
26 from .MLRsearch.ReceiveRateMeasurement import ReceiveRateMeasurement
27 from .PLRsearch.PLRsearch import PLRsearch
28 from .OptionString import OptionString
29 from .ssh import exec_cmd_no_error, exec_cmd
30 from .topology import NodeType
31 from .topology import NodeSubTypeTG
32 from .topology import Topology
34 __all__ = [u"TGDropRateSearchImpl", u"TrafficGenerator", u"OptimizedSearch"]
37 def check_subtype(node):
38 """Return supported subtype of given node, or raise an exception.
40 Currently only one subtype is supported,
41 but we want our code to be ready for other ones.
43 :param node: Topology node to check. Can be None.
44 :type node: dict or NoneType
45 :returns: Subtype detected.
47 :raises RuntimeError: If node is not supported, message explains how.
49 if node.get(u"type") is None:
50 msg = u"Node type is not defined"
51 elif node['type'] != NodeType.TG:
52 msg = f"Node type is {node[u'type']!r}, not a TG"
53 elif node.get(u"subtype") is None:
54 msg = u"TG subtype is not defined"
55 elif node[u"subtype"] != NodeSubTypeTG.TREX:
56 msg = f"TG subtype {node[u'subtype']!r} is not supported"
58 return NodeSubTypeTG.TREX
59 raise RuntimeError(msg)
62 class TGDropRateSearchImpl(DropRateSearch):
63 """Drop Rate Search implementation."""
66 # super(TGDropRateSearchImpl, self).__init__()
69 self, rate, frame_size, loss_acceptance, loss_acceptance_type,
70 traffic_profile, skip_warmup=False):
71 """Runs the traffic and evaluate the measured results.
73 :param rate: Offered traffic load.
74 :param frame_size: Size of frame.
75 :param loss_acceptance: Permitted drop ratio or frames count.
76 :param loss_acceptance_type: Type of permitted loss.
77 :param traffic_profile: Module name as a traffic profile identifier.
78 See resources/traffic_profiles/trex for implemented modules.
79 :param skip_warmup: Start TRex without warmup traffic if true.
82 :type loss_acceptance: float
83 :type loss_acceptance_type: LossAcceptanceType
84 :type traffic_profile: str
85 :type skip_warmup: bool
86 :returns: Drop threshold exceeded? (True/False)
88 :raises NotImplementedError: If TG is not supported.
89 :raises RuntimeError: If TG is not specified.
91 # we need instance of TrafficGenerator instantiated by Robot Framework
92 # to be able to use trex_stl-*()
93 tg_instance = BuiltIn().get_library_instance(
94 u"resources.libraries.python.TrafficGenerator"
96 subtype = check_subtype(tg_instance.node)
97 if subtype == NodeSubTypeTG.TREX:
98 unit_rate = str(rate) + self.get_rate_type_str()
100 tg_instance.trex_stl_start_remote_exec(
101 self.get_duration(), unit_rate, frame_size, traffic_profile,
105 tg_instance.trex_stl_start_remote_exec(
106 self.get_duration(), unit_rate, frame_size, traffic_profile
108 loss = tg_instance.get_loss()
109 sent = tg_instance.get_sent()
110 if self.loss_acceptance_type_is_percentage():
111 loss = (float(loss) / float(sent)) * 100
113 f"comparing: {loss} < {loss_acceptance} {loss_acceptance_type}"
115 return float(loss) <= float(loss_acceptance)
118 def get_latency(self):
119 """Returns min/avg/max latency.
121 :returns: Latency stats.
124 tg_instance = BuiltIn().get_library_instance(
125 u"resources.libraries.python.TrafficGenerator"
127 return tg_instance.get_latency_int()
130 # TODO: Pylint says too-many-instance-attributes.
131 # A fix is developed in https://gerrit.fd.io/r/c/csit/+/22221
132 class TrafficGenerator(AbstractMeasurer):
133 """Traffic Generator.
135 FIXME: Describe API."""
137 # TODO: Decrease friction between various search and rate provider APIs.
138 # TODO: Remove "trex" from lines which could work with other TGs.
140 # Use one instance of TrafficGenerator for all tests in test suite
141 ROBOT_LIBRARY_SCOPE = u"TEST SUITE"
144 # TODO: Number of fields will be reduced with CSIT-1378.
146 # T-REX interface order mapping
147 self._ifaces_reordered = False
148 # Result holding fields, to be removed.
153 self._received = None
154 # Measurement input fields, needed for async stop result.
155 self._start_time = None
157 # Other input parameters, not knowable from measure() signature.
158 self.frame_size = None
159 self.traffic_profile = None
160 self.warmup_time = None
161 self.traffic_directions = None
162 # Transient data needed for async measurements.
163 self._xstats = (None, None)
164 # TODO: Rename "xstats" to something opaque, so TRex is not privileged?
170 :returns: Traffic generator node.
176 """Return number of lost packets.
178 :returns: Number of lost packets.
184 """Return number of sent packets.
186 :returns: Number of sent packets.
191 def get_received(self):
192 """Return number of received packets.
194 :returns: Number of received packets.
197 return self._received
199 def get_latency_int(self):
200 """Return rounded min/avg/max latency.
202 :returns: Latency stats.
207 # TODO: pylint says disable=too-many-locals.
208 # A fix is developed in https://gerrit.fd.io/r/c/csit/+/22221
209 def initialize_traffic_generator(
210 self, tg_node, tg_if1, tg_if2, tg_if1_adj_node, tg_if1_adj_if,
211 tg_if2_adj_node, tg_if2_adj_if, osi_layer, tg_if1_dst_mac=None,
212 tg_if2_dst_mac=None):
213 """TG initialization.
215 TODO: Document why do we need (and how do we use) _ifaces_reordered.
217 :param tg_node: Traffic generator node.
218 :param tg_if1: TG - name of first interface.
219 :param tg_if2: TG - name of second interface.
220 :param tg_if1_adj_node: TG if1 adjecent node.
221 :param tg_if1_adj_if: TG if1 adjecent interface.
222 :param tg_if2_adj_node: TG if2 adjecent node.
223 :param tg_if2_adj_if: TG if2 adjecent interface.
224 :param osi_layer: 'L2', 'L3' or 'L7' - OSI Layer testing type.
225 :param tg_if1_dst_mac: Interface 1 destination MAC address.
226 :param tg_if2_dst_mac: Interface 2 destination MAC address.
230 :type tg_if1_adj_node: dict
231 :type tg_if1_adj_if: str
232 :type tg_if2_adj_node: dict
233 :type tg_if2_adj_if: str
235 :type tg_if1_dst_mac: str
236 :type tg_if2_dst_mac: str
238 :raises RuntimeError: In case of issue during initialization.
240 subtype = check_subtype(tg_node)
241 if subtype == NodeSubTypeTG.TREX:
244 if1_pci = Topology().get_interface_pci_addr(self._node, tg_if1)
245 if2_pci = Topology().get_interface_pci_addr(self._node, tg_if2)
246 if1_addr = Topology().get_interface_mac(self._node, tg_if1)
247 if2_addr = Topology().get_interface_mac(self._node, tg_if2)
249 if osi_layer == u"L2":
250 if1_adj_addr = if2_addr
251 if2_adj_addr = if1_addr
252 elif osi_layer == u"L3":
253 if1_adj_addr = Topology().get_interface_mac(
254 tg_if1_adj_node, tg_if1_adj_if
256 if2_adj_addr = Topology().get_interface_mac(
257 tg_if2_adj_node, tg_if2_adj_if
259 elif osi_layer == u"L7":
260 if1_addr = Topology().get_interface_ip4(self._node, tg_if1)
261 if2_addr = Topology().get_interface_ip4(self._node, tg_if2)
262 if1_adj_addr = Topology().get_interface_ip4(
263 tg_if1_adj_node, tg_if1_adj_if
265 if2_adj_addr = Topology().get_interface_ip4(
266 tg_if2_adj_node, tg_if2_adj_if
269 raise ValueError(u"Unknown Test Type")
271 # in case of switched environment we can override MAC addresses
272 if tg_if1_dst_mac is not None and tg_if2_dst_mac is not None:
273 if1_adj_addr = tg_if1_dst_mac
274 if2_adj_addr = tg_if2_dst_mac
276 if min(if1_pci, if2_pci) != if1_pci:
277 if1_pci, if2_pci = if2_pci, if1_pci
278 if1_addr, if2_addr = if2_addr, if1_addr
279 if1_adj_addr, if2_adj_addr = if2_adj_addr, if1_adj_addr
280 self._ifaces_reordered = True
282 master_thread_id, latency_thread_id, socket, threads = \
283 CpuUtils.get_affinity_trex(
284 self._node, tg_if1, tg_if2,
285 tg_dtc=Constants.TREX_CORE_COUNT)
287 if osi_layer in (u"L2", u"L3"):
288 dst_mac0 = f"0x{if1_adj_addr.replace(u':', u',0x')}"
289 src_mac0 = f"0x{if1_addr.replace(u':', u',0x')}"
290 dst_mac1 = f"0x{if2_adj_addr.replace(u':', u',0x')}"
291 src_mac1 = f"0x{if2_addr.replace(u':', u',0x')}"
294 f"sh -c 'cat << EOF > /etc/trex_cfg.yaml\n"
296 f" c: {len(threads)}\n"
297 f" limit_memory: {Constants.TREX_LIMIT_MEMORY}\n"
298 f" interfaces: [\"{if1_pci}\",\"{if2_pci}\"]\n"
300 f" - dest_mac: [{dst_mac0}]\n"
301 f" src_mac: [{src_mac0}]\n"
302 f" - dest_mac: [{dst_mac1}]\n"
303 f" src_mac: [{src_mac1}]\n"
305 f" master_thread_id: {master_thread_id}\n"
306 f" latency_thread_id: {latency_thread_id}\n"
308 f" - socket: {socket}\n"
309 f" threads: {threads}\n"
311 sudo=True, message=u"TRex config generation!"
313 elif osi_layer == u"L7":
316 f"sh -c 'cat << EOF > /etc/trex_cfg.yaml\n"
318 f" c: {len(threads)}\n"
319 f" limit_memory: {Constants.TREX_LIMIT_MEMORY}\n"
320 f" interfaces: [\"{if1_pci}\",\"{if2_pci}\"]\n"
322 f" - ip: [{if1_addr}]\n"
323 f" default_gw: [{if1_adj_addr}]\n"
324 f" - ip: [{if2_addr}]\n"
325 f" default_gw: [{if2_adj_addr}]\n"
327 f" master_thread_id: {master_thread_id}\n"
328 f" latency_thread_id: {latency_thread_id}\n"
330 f" - socket: {socket}\n"
331 f" threads: {threads}\n"
333 sudo=True, message=u"TRex config generation!"
336 raise ValueError(u"Unknown Test Type!")
338 self._startup_trex(osi_layer)
340 def _startup_trex(self, osi_layer):
341 """Startup sequence for the TRex traffic generator.
343 :param osi_layer: 'L2', 'L3' or 'L7' - OSI Layer testing type.
345 :raises RuntimeError: If node subtype is not a TREX or startup failed.
347 # No need to check subtype, we know it is TREX.
348 for _ in range(0, 3):
349 # Kill TRex only if it is already running.
350 cmd = u"sh -c \"pgrep t-rex && pkill t-rex && sleep 3 || true\""
352 self._node, cmd, sudo=True, message=u"Kill TRex failed!"
357 for port in self._node[u"interfaces"].values():
358 ports += f" {port.get(u'pci_address')}"
360 cmd = f"sh -c \"cd {Constants.TREX_INSTALL_DIR}/scripts/ && " \
361 f"./dpdk_nic_bind.py -u {ports} || true\""
363 self._node, cmd, sudo=True,
364 message=u"Unbind PCI ports from driver failed!"
368 cd_cmd = f"cd '{Constants.TREX_INSTALL_DIR}/scripts/'"
369 trex_cmd = OptionString([u"nohup", u"./t-rex-64"])
371 trex_cmd.add(u"--prefix $(hostname)")
372 trex_cmd.add(u"--hdrh")
373 trex_cmd.add(u"--no-scapy-server")
374 trex_cmd.add_if(u"--astf", osi_layer == u"L7")
375 # OptionString does not create double space if extra is empty.
376 trex_cmd.add(f"{Constants.TREX_EXTRA_CMDLINE}")
377 inner_command = f"{cd_cmd} && {trex_cmd} > /tmp/trex.log 2>&1 &"
378 cmd = f"sh -c \"{inner_command}\" > /dev/null"
380 exec_cmd_no_error(self._node, cmd, sudo=True)
382 cmd = u"sh -c \"cat /tmp/trex.log\""
384 self._node, cmd, sudo=True, message=u"Get TRex logs failed!"
386 raise RuntimeError(u"Start TRex failed!")
388 # Test if TRex starts successfuly.
389 cmd = f"sh -c \"{Constants.REMOTE_FW_DIR}/resources/tools/trex/" \
390 f"trex_server_info.py\""
393 self._node, cmd, sudo=True, message=u"Test TRex failed!",
399 # After max retries TRex is still not responding to API critical error
401 exec_cmd(self._node, u"cat /tmp/trex.log", sudo=True)
402 raise RuntimeError(u"Start TRex failed after multiple retries!")
405 def is_trex_running(node):
406 """Check if TRex is running using pidof.
408 :param node: Traffic generator node.
410 :returns: True if TRex is running otherwise False.
412 :raises RuntimeError: If node type is not a TG.
414 ret, _, _ = exec_cmd(node, u"pidof t-rex", sudo=True)
415 return bool(int(ret) == 0)
418 def teardown_traffic_generator(node):
421 :param node: Traffic generator node.
424 :raises RuntimeError: If node type is not a TG,
425 or if TRex teardown fails.
427 subtype = check_subtype(node)
428 if subtype == NodeSubTypeTG.TREX:
430 node, u"sh -c \"sudo pkill t-rex && sleep 3\"",
431 sudo=False, message=u"pkill t-rex failed"
434 def _parse_traffic_results(self, stdout):
435 """Parse stdout of scripts into fields of self.
437 Block of code to reuse, by sync start, or stop after async.
438 TODO: Is the output TG subtype dependent?
440 :param stdout: Text containing the standard output.
443 # last line from console output
444 line = stdout.splitlines()[-1]
446 logger.info(f"TrafficGen result: {self._result}")
447 self._received = self._result.split(u", ")[1].split(u"=", 1)[1]
448 self._sent = self._result.split(u", ")[2].split(u"=", 1)[1]
449 self._loss = self._result.split(u", ")[3].split(u"=", 1)[1]
450 self._latency = list()
451 self._latency.append(self._result.split(u", ")[4].split(u"=", 1)[1])
452 self._latency.append(self._result.split(u", ")[5].split(u"=", 1)[1])
454 def trex_stl_stop_remote_exec(self, node):
455 """Execute script on remote node over ssh to stop running traffic.
457 Internal state is updated with measurement results.
459 :param node: TRex generator node.
461 :raises RuntimeError: If stop traffic script fails.
463 # No need to check subtype, we know it is TREX.
465 for index, value in enumerate(self._xstats):
466 if value is not None:
467 # Nested quoting is fun.
468 value = value.replace(u"'", u"\"")
469 x_args += f" --xstat{index}='\"'\"'{value}'\"'\"'"
470 stdout, _ = exec_cmd_no_error(
471 node, f"sh -c '{Constants.REMOTE_FW_DIR}/resources/tools/trex/"
472 f"trex_stateless_stop.py{x_args}'",
473 message=u"TRex stateless runtime error"
475 self._parse_traffic_results(stdout)
477 def trex_stl_start_remote_exec(
478 self, duration, rate, frame_size, traffic_profile, async_call=False,
479 latency=True, warmup_time=5.0, traffic_directions=2, tx_port=0,
481 """Execute script on remote node over ssh to start traffic.
483 In sync mode, measurement results are stored internally.
484 In async mode, initial data including xstats are stored internally.
486 :param duration: Time expresed in seconds for how long to send traffic.
487 :param rate: Traffic rate expressed with units (pps, %)
488 :param frame_size: L2 frame size to send (without padding and IPG).
489 :param traffic_profile: Module name as a traffic profile identifier.
490 See resources/traffic_profiles/trex for implemented modules.
491 :param async_call: If enabled then don't wait for all incomming trafic.
492 :param latency: With latency measurement.
493 :param warmup_time: Warmup time period.
494 :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
496 :param tx_port: Traffic generator transmit port for first flow.
498 :param rx_port: Traffic generator receive port for first flow.
500 :type duration: float
502 :type frame_size: str
503 :type traffic_profile: str
504 :type async_call: bool
506 :type warmup_time: float
507 :type traffic_directions: int
510 :raises RuntimeError: In case of TG driver issue.
512 # No need to check subtype, we know it is TREX.
513 reorder = self._ifaces_reordered # Just to make the next line fit.
514 p_0, p_1 = (rx_port, tx_port) if reorder else (tx_port, rx_port)
516 if not isinstance(duration, (float, int)):
517 duration = float(duration)
518 if not isinstance(warmup_time, (float, int)):
519 warmup_time = float(warmup_time)
520 command = f"sh -c \"" \
521 f"{Constants.REMOTE_FW_DIR}/resources/tools/trex/" \
522 f"trex_stateless_profile.py " \
523 f"--profile {Constants.REMOTE_FW_DIR}/resources/" \
524 f"traffic_profiles/trex/{traffic_profile}.py " \
525 f"--duration {duration!r} --frame_size {frame_size} " \
526 f"--rate {rate!r} --warmup_time {warmup_time!r} " \
527 f"--port_0 {p_0} --port_1 {p_1} " \
528 f"--traffic_directions {traffic_directions}"
530 command += u" --async_start"
532 command += u" --latency"
533 if Constants.TREX_SEND_FORCE:
534 command += u" --force"
537 stdout, _ = exec_cmd_no_error(
538 self._node, command, timeout=float(duration) + 60,
539 message=u"TRex stateless runtime error"
542 self.traffic_directions = traffic_directions
545 self._start_time = time.time()
546 self._rate = float(rate[:-3]) if u"pps" in rate else float(rate)
547 self._received = None
551 xstats = [None, None]
553 for line in stdout.splitlines():
554 if f"Xstats snapshot {index}: " in line:
555 xstats[index] = line[19:]
559 self._xstats = tuple(xstats)
561 self._parse_traffic_results(stdout)
562 self._start_time = None
565 def stop_traffic_on_tg(self):
566 """Stop all traffic on TG.
568 :returns: Structure containing the result of the measurement.
569 :rtype: ReceiveRateMeasurement
570 :raises RuntimeError: If TG is not set.
572 subtype = check_subtype(self._node)
573 if subtype == NodeSubTypeTG.TREX:
574 self.trex_stl_stop_remote_exec(self._node)
575 return self.get_measurement_result()
577 def send_traffic_on_tg(
578 self, duration, rate, frame_size, traffic_profile, warmup_time=5,
579 async_call=False, latency=True, traffic_directions=2, tx_port=0,
581 """Send traffic from all configured interfaces on TG.
583 In async mode, xstats is stored internally,
584 to enable getting correct result when stopping the traffic.
585 In both modes, stdout is returned,
586 but _parse_traffic_results only works in sync output.
588 Note that bidirectional traffic also contains flows
589 transmitted from rx_port and received in tx_port.
590 But some tests use asymmetric traffic, so those arguments are relevant.
592 Also note that traffic generator uses DPDK driver which might
593 reorder port numbers based on wiring and PCI numbering.
594 This method handles that, so argument values are invariant,
595 but you can see swapped valued in debug logs.
597 TODO: Is it better to have less descriptive argument names
598 just to make them less probable to be viewed as misleading or confusing?
599 See https://gerrit.fd.io/r/#/c/17625/11/resources/libraries/python\
600 /TrafficGenerator.py@406
602 :param duration: Duration of test traffic generation in seconds.
603 :param rate: Offered load per interface (e.g. 1%, 3gbps, 4mpps, ...).
604 :param frame_size: Frame size (L2) in Bytes.
605 :param traffic_profile: Module name as a traffic profile identifier.
606 See resources/traffic_profiles/trex for implemented modules.
607 :param warmup_time: Warmup phase in seconds.
608 :param async_call: Async mode.
609 :param latency: With latency measurement.
610 :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
612 :param tx_port: Traffic generator transmit port for first flow.
614 :param rx_port: Traffic generator receive port for first flow.
618 :type frame_size: str
619 :type traffic_profile: str
620 :type warmup_time: float
621 :type async_call: bool
623 :type traffic_directions: int
628 :raises RuntimeError: If TG is not set, or if node is not TG,
629 or if subtype is not specified.
630 :raises NotImplementedError: If TG is not supported.
632 subtype = check_subtype(self._node)
633 if subtype == NodeSubTypeTG.TREX:
634 self.trex_stl_start_remote_exec(
635 duration, rate, frame_size, traffic_profile, async_call,
636 latency, warmup_time, traffic_directions, tx_port, rx_port
641 def no_traffic_loss_occurred(self):
642 """Fail if loss occurred in traffic run.
645 :raises Exception: If loss occured.
647 if self._loss is None:
648 raise RuntimeError(u"The traffic generation has not been issued")
649 if self._loss != u"0":
650 raise RuntimeError(f"Traffic loss occurred: {self._loss}")
652 def fail_if_no_traffic_forwarded(self):
653 """Fail if no traffic forwarded.
656 :raises Exception: If no traffic forwarded.
658 if self._received is None:
659 raise RuntimeError(u"The traffic generation has not been issued")
660 if self._received == u"0":
661 raise RuntimeError(u"No traffic forwarded")
663 def partial_traffic_loss_accepted(
664 self, loss_acceptance, loss_acceptance_type):
665 """Fail if loss is higher then accepted in traffic run.
667 :param loss_acceptance: Permitted drop ratio or frames count.
668 :param loss_acceptance_type: Type of permitted loss.
669 :type loss_acceptance: float
670 :type loss_acceptance_type: LossAcceptanceType
672 :raises Exception: If loss is above acceptance criteria.
674 if self._loss is None:
675 raise Exception(u"The traffic generation has not been issued")
677 if loss_acceptance_type == u"percentage":
678 loss = (float(self._loss) / float(self._sent)) * 100
679 elif loss_acceptance_type == u"frames":
680 loss = float(self._loss)
682 raise Exception(u"Loss acceptance type not supported")
684 if loss > float(loss_acceptance):
686 f"Traffic loss {loss} above loss acceptance: {loss_acceptance}"
689 def set_rate_provider_defaults(
690 self, frame_size, traffic_profile, warmup_time=0.0,
691 traffic_directions=2):
692 """Store values accessed by measure().
694 :param frame_size: Frame size identifier or value [B].
695 :param traffic_profile: Module name as a traffic profile identifier.
696 See resources/traffic_profiles/trex for implemented modules.
697 :param warmup_time: Traffic duration before measurement starts [s].
698 :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
700 :type frame_size: str or int
701 :type traffic_profile: str
702 :type warmup_time: float
703 :type traffic_directions: int
705 self.frame_size = frame_size
706 self.traffic_profile = str(traffic_profile)
707 self.warmup_time = float(warmup_time)
708 self.traffic_directions = traffic_directions
710 def get_measurement_result(self, duration=None, transmit_rate=None):
711 """Return the result of last measurement as ReceiveRateMeasurement.
713 Separate function, as measurements can end either by time
714 or by explicit call, this is the common block at the end.
716 TODO: Fail on running or already reported measurement.
718 :param duration: Measurement duration [s] if known beforehand.
719 For explicitly stopped measurement it is estimated.
720 :param transmit_rate: Target aggregate transmit rate [pps].
721 If not given, computed assuming it was bidirectional.
722 :type duration: float or NoneType
723 :type transmit_rate: float or NoneType
724 :returns: Structure containing the result of the measurement.
725 :rtype: ReceiveRateMeasurement
728 duration = time.time() - self._start_time
729 self._start_time = None
730 if transmit_rate is None:
731 transmit_rate = self._rate * self.traffic_directions
732 transmit_count = int(self.get_sent())
733 loss_count = int(self.get_loss())
734 measurement = ReceiveRateMeasurement(
735 duration, transmit_rate, transmit_count, loss_count
737 measurement.latency = self.get_latency_int()
740 def measure(self, duration, transmit_rate):
741 """Run trial measurement, parse and return aggregate results.
743 Aggregate means sum over traffic directions.
745 :param duration: Trial duration [s].
746 :param transmit_rate: Target aggregate transmit rate [pps].
747 :type duration: float
748 :type transmit_rate: float
749 :returns: Structure containing the result of the measurement.
750 :rtype: ReceiveRateMeasurement
751 :raises RuntimeError: If TG is not set, or if node is not TG,
752 or if subtype is not specified.
753 :raises NotImplementedError: If TG is not supported.
755 duration = float(duration)
756 transmit_rate = float(transmit_rate)
757 # TG needs target Tr per stream, but reports aggregate Tx and Dx.
758 unit_rate_int = transmit_rate / float(self.traffic_directions)
759 unit_rate_str = str(unit_rate_int) + u"pps"
760 self.send_traffic_on_tg(
761 duration, unit_rate_str, self.frame_size, self.traffic_profile,
762 warmup_time=self.warmup_time, latency=True,
763 traffic_directions=self.traffic_directions
765 return self.get_measurement_result(duration, transmit_rate)
768 class OptimizedSearch:
769 """Class to be imported as Robot Library, containing search keywords.
771 Aside of setting up measurer and forwarding arguments,
772 the main business is to translate min/max rate from unidir to aggregate.
776 def perform_optimized_ndrpdr_search(
777 frame_size, traffic_profile, minimum_transmit_rate,
778 maximum_transmit_rate, packet_loss_ratio=0.005,
779 final_relative_width=0.005, final_trial_duration=30.0,
780 initial_trial_duration=1.0, number_of_intermediate_phases=2,
781 timeout=720.0, doublings=1, traffic_directions=2):
782 """Setup initialized TG, perform optimized search, return intervals.
784 :param frame_size: Frame size identifier or value [B].
785 :param traffic_profile: Module name as a traffic profile identifier.
786 See resources/traffic_profiles/trex for implemented modules.
787 :param minimum_transmit_rate: Minimal uni-directional
788 target transmit rate [pps].
789 :param maximum_transmit_rate: Maximal uni-directional
790 target transmit rate [pps].
791 :param packet_loss_ratio: Fraction of packets lost, for PDR [1].
792 :param final_relative_width: Final lower bound transmit rate
793 cannot be more distant that this multiple of upper bound [1].
794 :param final_trial_duration: Trial duration for the final phase [s].
795 :param initial_trial_duration: Trial duration for the initial phase
796 and also for the first intermediate phase [s].
797 :param number_of_intermediate_phases: Number of intermediate phases
798 to perform before the final phase [1].
799 :param timeout: The search will fail itself when not finished
800 before this overall time [s].
801 :param doublings: How many doublings to do in external search step.
802 Default 1 is suitable for fairly stable tests,
803 less stable tests might get better overal duration with 2 or more.
804 :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
806 :type frame_size: str or int
807 :type traffic_profile: str
808 :type minimum_transmit_rate: float
809 :type maximum_transmit_rate: float
810 :type packet_loss_ratio: float
811 :type final_relative_width: float
812 :type final_trial_duration: float
813 :type initial_trial_duration: float
814 :type number_of_intermediate_phases: int
817 :type traffic_directions: int
818 :returns: Structure containing narrowed down NDR and PDR intervals
819 and their measurements.
821 :raises RuntimeError: If total duration is larger than timeout.
823 minimum_transmit_rate *= traffic_directions
824 maximum_transmit_rate *= traffic_directions
825 # we need instance of TrafficGenerator instantiated by Robot Framework
826 # to be able to use trex_stl-*()
827 tg_instance = BuiltIn().get_library_instance(
828 u"resources.libraries.python.TrafficGenerator"
830 tg_instance.set_rate_provider_defaults(
831 frame_size, traffic_profile, traffic_directions=traffic_directions)
832 algorithm = MultipleLossRatioSearch(
833 measurer=tg_instance, final_trial_duration=final_trial_duration,
834 final_relative_width=final_relative_width,
835 number_of_intermediate_phases=number_of_intermediate_phases,
836 initial_trial_duration=initial_trial_duration, timeout=timeout,
839 result = algorithm.narrow_down_ndr_and_pdr(
840 minimum_transmit_rate, maximum_transmit_rate, packet_loss_ratio
845 def perform_soak_search(
846 frame_size, traffic_profile, minimum_transmit_rate,
847 maximum_transmit_rate, plr_target=1e-7, tdpt=0.1,
848 initial_count=50, timeout=1800.0, trace_enabled=False,
849 traffic_directions=2):
850 """Setup initialized TG, perform soak search, return avg and stdev.
852 :param frame_size: Frame size identifier or value [B].
853 :param traffic_profile: Module name as a traffic profile identifier.
854 See resources/traffic_profiles/trex for implemented modules.
855 :param minimum_transmit_rate: Minimal uni-directional
856 target transmit rate [pps].
857 :param maximum_transmit_rate: Maximal uni-directional
858 target transmit rate [pps].
859 :param plr_target: Fraction of packets lost to achieve [1].
860 :param tdpt: Trial duration per trial.
861 The algorithm linearly increases trial duration with trial number,
862 this is the increment between succesive trials, in seconds.
863 :param initial_count: Offset to apply before the first trial.
864 For example initial_count=50 makes first trial to be 51*tdpt long.
865 This is needed because initial "search" phase of integrator
866 takes significant time even without any trial results.
867 :param timeout: The search will stop after this overall time [s].
868 :param trace_enabled: True if trace enabled else False.
869 :param traffic_directions: Traffic is bi- (2) or uni- (1) directional.
871 :type frame_size: str or int
872 :type traffic_profile: str
873 :type minimum_transmit_rate: float
874 :type maximum_transmit_rate: float
875 :type plr_target: float
876 :type initial_count: int
878 :type trace_enabled: bool
879 :type traffic_directions: int
880 :returns: Average and stdev of estimated aggregate rate giving PLR.
881 :rtype: 2-tuple of float
883 minimum_transmit_rate *= traffic_directions
884 maximum_transmit_rate *= traffic_directions
885 tg_instance = BuiltIn().get_library_instance(
886 u"resources.libraries.python.TrafficGenerator"
888 tg_instance.set_rate_provider_defaults(
889 frame_size, traffic_profile, traffic_directions=traffic_directions)
890 algorithm = PLRsearch(
891 measurer=tg_instance, trial_duration_per_trial=tdpt,
892 packet_loss_ratio_target=plr_target,
893 trial_number_offset=initial_count, timeout=timeout,
894 trace_enabled=trace_enabled
896 result = algorithm.search(minimum_transmit_rate, maximum_transmit_rate)