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authorVratko Polak <vrpolak@cisco.com>2020-10-27 19:09:44 +0100
committerVratko Polak <vrpolak@cisco.com>2020-10-29 20:25:50 +0000
commit023fa41e51c966a1956bda6b915ffd894ff10e84 (patch)
treecdb96c99a8ade4855176c43969cbd9a06adf693b /resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py
parente31998ea56c55879fbaae8e58b0dad0bc6549dae (diff)
Support existing test types with ASTF
+ Add UDP_CPS, TCP_CPS, UDP_PPS and TCP_PPS suites. + Update existing cps traffic profiles. + Add missing traffic profiles. + UDP: + Single burst of 32 packets was confirmed as safe enough for TRex. + Maybe 64 could work, but not enough testing for that. + Multiple bursts have lead to reduced TRex performance, as overlaping bursts (from different client instances) tend to fill up the buffers. + TCP: + Data size set to 11111 bytes, completely arbitrarily. + Results look reasonable, so I have kept that. - MSS not set at all - No tested support for frame size other than 64B. - Frame size does not even factor into TCP profiles. + So other frame sizes are skipped in autogen. + Update tags in related suites. - HOSTS_{n} and SRC_USER_{n} should be unified. - Questionable clarification on difference between IP4BASE and SCALE. + Add NAT state resetters to tests that need them. + Resetter is called (if set) before each measurement. + If ramp-up is detected, resetter is not set. + Rename "mult" argument to "multiplier". + Abstracted from packets to transactions. + Transaction corresponds to profile. + TRex multiplier argument sets target rate in transactions per second. + The familiar STL traffic: + Bidirectional is considered to be 2 packets per transaction. + Unidirectional is considered to be 1 packet per transaction. + The newer ASTF traffic: + 4 subtypes, each has different number of packets per transaction. + For max rate computation: + Packets in the more numerous direction are considered. + Rely on TRex reported traffic duration for ASTF: + Use the server side value. - Client side value is higher by an overhead. - TRex is not sending traffic during that time. + Remove delays from traffic profiles. - Those delays would increase the reprted traffic time. + Support for scale lmited trials. + Only for ASTF profiles, each ASTF profile has limited scale. + Scale defined in suite variables. + For TRex to send all transactions provided duration value is ignored. + The appropriate value is computed in TrafficGenerator. + An ad-hoc time constant is added to match the TRex client side time overhead. + The profile driver receives the computed duration. + Measurement for PLRsearch add a sleep if the computed duration is smaller. + Alternative argument for search algos if scale is limited. + Both need higher timeout to accomodate big scales. + MLRsearch can afford fewer phases. + Added a parameter to optionally shorten the duration. + Use short duration for runtime stats trial and failure stats trial. + Use very large keepalive values in udp profiles to avoid ka packets. + No polling in ASTF profile driver. - Polling could eliminate the time overhead value. + But polling proved to introduce some loss, affecting the results. + Handle duration stretching in ASTF by stopping traffic. + The stop has several steps so that: + The traffic is really stopped entirely. + Late packets do not count (maybe as errors). + Stats are preserved to read for results (and cleared afterwards). + Several quantities added to ReceiveRateMeasurement: + Original target duration is preserved (algos need that). + Input estimate (tps) for early search iterations. + Output estimate (maybe pps) for MRR output. + Strict result (unsent counts as loss) for NDR. + Use L2 counters (opackets, ipackets) where possible. - TRex has trouble processing packets for the L7 ones at high loads. + Remove warmup from profile drivers and keywords. + Suites should call "Send ramp-up traffic" explicitly if needed. + Added parsing for few more counters. + Both to use in formulas or just for debug purposes. - Only 64B cases in autogen, framesize support to be added later. + Latency streams during search can be enabled via PERF_USE_LATENCY env var. + MLRsearch improvments: + Rename argument names to min_rate and max_rate. + Use relative receive rate in initial phase. + PLRsearch improvements: + Careful computation when output (pps) does not match input (tps). + Use geometric distribution (instead of Poisson). + Helps agains math errors. + This should improve estimate stability. - But in practice big losses still lead to significant jumps. + Traffic generator improvements: + send_traffic_on_tg now calls the full set_rate_provider_defaults. + _send_traffic_on_tg_internal for the logic without provider defaults. + As the internal function is re-used by measure() without affecting defaults. + Move _parse_traffic_results just before get_measurement_result. + As the latter uses fields set bu the former, it is now easier to read. + Multiple sources for approximate duration. + Tried from more precise to more available. + Includes logic for _pps tests (added in later change). + Move explicit type conversions to earlier occurences. + Profile driver output field uses semicolons to simplify parsing. + Performance Robot lib file split to several smaller ones. + performance_actions.robot: + Hosts Additional Statistics Action For * keywords. + performance_display.robot: + Hosts keyword for displaying and verifying results. + Change test message to use the correct unit (pps or cps). + performance_limits.robot renamed to performance_vars.robot + Added many keywords, mostly for accessing test variables. + Moved variables for Policer into a new keyword there. + Some keywords need sophisticated logic. - Other are basically Get Variable Value. + But in future more logic can be added, without editing callers. + Documentation for the new keywords acts as a documentation for test variables. + performance_utils.robot has the rest. + Eliminated arguments if the value is in test variable. + Small improvements to documentation. - Still not enough cleanup with respect to arguments and test variables. + Keywords are sorted alphabetically now in each one. + Suites: + Unified variables table: + No colons in comments. + ${n_hosts}, ${n_ports} and use them instead hardcoded numbers. + Add -cps to existing cps suite names. + Remove "trial data overwrite". + Compute max rate as in STL suites. + Each NAT suite has ip4base suite to compare results to. - Those act as indirect TRex calibration. - VPP does not lose packets in those. + Latency in ASTF suites is disabled hard. - As we do not support latency in ASTF profiles yet. + Unidirectional tests governed by suite variable, not an argument. + Write long argument lists vertically. + Prefer to use argument names. + In Python, also the last argument is followed by comma. + It makes renaming and reordering easier. + Similarly applies to prints with long lists of values. + A TODO to update api crc file comments. Change-Id: I84729355edbec051298a9de1162107f88ff5737d Signed-off-by: Vratko Polak <vrpolak@cisco.com>
Diffstat (limited to 'resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py')
-rw-r--r--resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py66
1 files changed, 61 insertions, 5 deletions
diff --git a/resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py b/resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py
index 31a6f8202e..c732e66026 100644
--- a/resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py
+++ b/resources/libraries/python/MLRsearch/ReceiveRateMeasurement.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2019 Cisco and/or its affiliates.
+# Copyright (c) 2020 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
@@ -17,18 +17,39 @@
class ReceiveRateMeasurement:
"""Structure defining the result of single Rr measurement."""
- def __init__(self, duration, target_tr, transmit_count, loss_count):
+ def __init__(
+ self, duration, target_tr, transmit_count, loss_count,
+ approximated_duration=0.0, partial_transmit_count=0):
"""Constructor, normalize primary and compute secondary quantities.
+ If approximated_duration is nonzero, it is stored.
+ If approximated_duration is zero, duration value is stored.
+ Either way, additional secondary quantities are computed
+ from the store value.
+
+ If there is zero transmit_count, fractions are set to zero.
+
+ In some cases, traffic generator does not attempt all the needed
+ transactions. In that case, nonzero partial_transmit_count
+ holds (an estimate of) count of the actually attempted transactions.
+ This is used to populate some secondary quantities.
+
+ TODO: Use None instead of zero?
+
:param duration: Measurement duration [s].
:param target_tr: Target transmit rate [pps].
If bidirectional traffic is measured, this is bidirectional rate.
:param transmit_count: Number of packets transmitted [1].
:param loss_count: Number of packets transmitted but not received [1].
+ :param approximated_duration: Estimate of the actual time of the trial.
+ :param partial_transmit_count: Estimate count of actually attempted
+ transactions.
:type duration: float
:type target_tr: float
:type transmit_count: int
:type loss_count: int
+ :type approximated_duration: float
+ :type partial_transmit_count: int
"""
self.duration = float(duration)
self.target_tr = float(target_tr)
@@ -38,8 +59,41 @@ class ReceiveRateMeasurement:
self.transmit_rate = transmit_count / self.duration
self.loss_rate = loss_count / self.duration
self.receive_rate = self.receive_count / self.duration
- self.loss_fraction = float(self.loss_count) / self.transmit_count
- # TODO: Do we want to store also the real time (duration + overhead)?
+ self.loss_fraction = (
+ float(self.loss_count) / self.transmit_count
+ if self.transmit_count > 0 else 1.0
+ )
+ self.receive_fraction = (
+ float(self.receive_count) / self.transmit_count
+ if self.transmit_count > 0 else 0.0
+ )
+ self.approximated_duration = (
+ float(approximated_duration) if approximated_duration
+ else self.duration
+ )
+ self.approximated_receive_rate = (
+ self.receive_count / self.approximated_duration
+ if self.approximated_duration > 0.0 else 0.0
+ )
+ # If the traffic generator is unreliable and sends less packets,
+ # the absolute receive rate might be too low for next target.
+ self.partial_transmit_count = (
+ int(partial_transmit_count) if partial_transmit_count
+ else self.transmit_count
+ )
+ self.partial_receive_fraction = (
+ float(self.receive_count) / self.partial_transmit_count
+ if self.partial_transmit_count > 0 else 0.0
+ )
+ self.partial_receive_rate = (
+ self.target_tr * self.partial_receive_fraction
+ )
+ # We use relative packet ratios in order to support cases
+ # where target_tr is in transactions per second,
+ # but there are multiple packets per transaction.
+ self.relative_receive_rate = (
+ self.target_tr * self.receive_count / self.transmit_count
+ )
def __str__(self):
"""Return string reporting input and loss fraction."""
@@ -51,4 +105,6 @@ class ReceiveRateMeasurement:
return f"ReceiveRateMeasurement(duration={self.duration!r}," \
f"target_tr={self.target_tr!r}," \
f"transmit_count={self.transmit_count!r}," \
- f"loss_count={self.loss_count!r})"
+ f"loss_count={self.loss_count!r}," \
+ f"approximated_duration={self.approximated_duration!r}," \
+ f"partial_transmit_count={self.partial_transmit_count!r})"