[dts] [v2 0/6] revise tests/nic_signle_core_perf

[dts] [v2 0/6] revise tests/nic_signle_core_perf

[Lijuan Tu]

* changed pass / fail determination to be percentage based
* made multiple traffic measurements during the test run to
  collect better statistics

Group agreed in CI Meeting:
  https://mails.dpdk.org/archives/ci/2021-February/001049.html

* v2: 
  * changed percentage to a float
  * separate to serval patches
  * fix rx desc size

Lijuan Tu (6):
  tests/nic_single_core_perf: beauty JSON string
  tests/nic_single_core_perf: get better throughput stats
  tests/nic_single_core_perf: revise rst table
  tests/nic_single_core_perf: revise delta to ratio
  tests/nic_single_core_perf: add expected mpps into JSON
  tests/nic_single_core_perf: revise rx desc size

 conf/nic_single_core_perf.cfg           |  18 +++-
 tests/TestSuite_nic_single_core_perf.py | 112 +++++++++++++++---------
 2 files changed, 83 insertions(+), 47 deletions(-)

-- 
2.25.1

[dts] [v2 1/6] tests/nic_single_core_perf: beauty JSON string

[Lijuan Tu]

with seperators and intent, the JSON are more human friendly.

before:
    {"test_perf_nic_single_core": [{ "parameters": [{"name": "Txd/Rxd", ...}, ... }
after:
    {
        "test_perf_nic_single_core": [
            {
                "parameters": [
                    {
                        "name": "Txd/Rxd",
                         ...
                    },
        ...
    }

Signed-off-by: Lijuan Tu <lijuan.tu@intel.com>
---
 tests/TestSuite_nic_single_core_perf.py | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tests/TestSuite_nic_single_core_perf.py b/tests/TestSuite_nic_single_core_perf.py
index 8266506b..edb4465d 100644
--- a/tests/TestSuite_nic_single_core_perf.py
+++ b/tests/TestSuite_nic_single_core_perf.py
@@ -368,10 +368,11 @@ class TestNicSingleCorePerf(TestCase):
                     row_dict0['parameters'].append(row_dict4)
                     json_obj[case_name].append(row_dict0)
                     status_result.append(row_dict0['status'])
-        with open(os.path.join(rst.path2Result,
-                               '{0:s}_single_core_perf.json'.format(
-                                   self.nic)), 'w') as fp:
-            json.dump(json_obj, fp)
+
+        json_file = os.path.join(rst.path2Result, '{0:s}_single_core_perf.json'.format(self.nic))
+        with open(json_file, 'w') as fp:
+            json.dump(json_obj, fp, indent=4, separators=(',', ': '), sort_keys=True)
+
         self.verify("FAIL" not in status_result, "Excessive gap between test results and expectations")
 
     def set_fields(self):
-- 
2.25.1

[dts] [v2 2/6] tests/nic_single_core_perf: get better throughput stats

[Lijuan Tu]

Snice throughput is easily fluctuated, we want to imporve reliable
for results by following:

* get multiple throughput statistics during the run time.
* remove the maximum and minimum and get average.
* sample interval could be configed by users

Signed-off-by: Lijuan Tu <lijuan.tu@intel.com>
---
 conf/nic_single_core_perf.cfg           |  4 +++
 tests/TestSuite_nic_single_core_perf.py | 42 +++++++++++++++++++------
 2 files changed, 37 insertions(+), 9 deletions(-)

diff --git a/conf/nic_single_core_perf.cfg b/conf/nic_single_core_perf.cfg
index 4d3279ba..e6b0a5af 100644
--- a/conf/nic_single_core_perf.cfg
+++ b/conf/nic_single_core_perf.cfg
@@ -5,6 +5,9 @@
 # numbers, and the pattern is
 #    {'frame size': ['descriptor number #1', 'descriptor number #2']}
 #
+#  - throughput_stat_sample_interval defines interval of get throughput
+#  statistics (second). If not set, it is 5 seconds by default.
+#
 #  - test_duration is how many seconds each combination performance will
 #  be recorded.
 #
@@ -34,6 +37,7 @@ test_parameters = {'1C/1T': {64: [512, 2048]},
                     '1C/2T': {64: [512, 2048]}}
 rx_desc_16byte = 'y'
 test_duration = 60
+throughput_stat_sample_interval = 2
 accepted_tolerance = 1
 expected_throughput = {
     'fortville_spirit': {
diff --git a/tests/TestSuite_nic_single_core_perf.py b/tests/TestSuite_nic_single_core_perf.py
index edb4465d..a0a257dd 100644
--- a/tests/TestSuite_nic_single_core_perf.py
+++ b/tests/TestSuite_nic_single_core_perf.py
@@ -41,6 +41,7 @@ from exception import VerifyFailure
 from settings import HEADER_SIZE, UPDATE_EXPECTED, load_global_setting
 from pmd_output import PmdOutput
 from copy import deepcopy
+from numpy import mean
 import rst
 from pktgen import PacketGeneratorHelper
 
@@ -96,6 +97,7 @@ class TestNicSingleCorePerf(TestCase):
 
         # traffic duraion in second
         self.test_duration = self.get_suite_cfg()['test_duration']
+        self.throughput_stat_sample_interval = self.get_suite_cfg().get('throughput_stat_sample_interval', 5)
 
         # load the expected throughput for required nic
         if self.nic in ["ConnectX4_LX_MT4117"]:
@@ -265,21 +267,43 @@ class TestNicSingleCorePerf(TestCase):
                     # run packet generator
                     streams = self.pktgen_helper.prepare_stream_from_tginput(tgenInput, 100, vm_config, self.tester.pktgen)
                     # set traffic option
-                    traffic_opt = {'duration': self.test_duration}
-                    # _, pps = self.tester.traffic_generator_throughput(tgenInput, rate_percent=100, delay=30)
-                    _, packets_received = self.tester.pktgen.measure_throughput(stream_ids=streams, options=traffic_opt)
-                    self.verify(packets_received > 0, "No traffic detected")
-                    throughput = packets_received / 1000000.0
-                    self.throughput[fwd_config][frame_size][nb_desc] = throughput
+                    traffic_opt = {
+                        'method': 'throughput',
+                        'rate': 100,
+                        'duration': self.test_duration,
+                        'interval': self.throughput_stat_sample_interval,
+                        }
+                    stats = self.tester.pktgen.measure(stream_ids=streams, traffic_opt=traffic_opt)
+
+                    #####################################################
+                    # Remove max and min if count >=5, then get average
+                    #####################################################
+                    if isinstance(stats, list):
+                        total_pps_rxs = []
+                        c = len(stats)
+                        for i in range(c):
+                            stats_pps = stats[i][1]
+                            if isinstance(stats_pps, tuple):
+                                total_pps_rxs.append(stats_pps[1])
+                            else:
+                                total_pps_rxs.append(stats_pps)
+                        if c >= 5:
+                            total_pps_rxs.remove(max(total_pps_rxs))
+                            total_pps_rxs.remove(min(total_pps_rxs))
+                        total_pps_rx = mean(total_pps_rxs)
+                    else:
+                        total_pps_rx = stats
+
+                    self.verify(total_pps_rx > 0, "No traffic detected, please check your configuration")
+                    total_mpps_rx = total_pps_rx / 1000000.0
+                    self.throughput[fwd_config][frame_size][nb_desc] = total_mpps_rx
 
                     self.dut.send_expect("stop", "testpmd> ")
                     self.dut.send_expect("quit", "# ", 30)
 
-                    self.verify(throughput,
-                        "No traffic detected, please check your configuration")
                     self.logger.info("Trouthput of " +
                         "framesize: {}, rxd/txd: {} is :{} Mpps".format(
-                            frame_size, nb_desc, throughput))
+                            frame_size, nb_desc, total_mpps_rx))
 
         return self.throughput
 
-- 
2.25.1

[dts] [v2 3/6] tests/nic_single_core_perf: revise rst table

[Lijuan Tu]

add more info in rst table, and rename headers to reduce width.

before:
  +----------+------------+---------+------------+--------+---------------------+-----------------------+
  | Fwd_core | Frame Size | TXD/RXD | Throughput |  Rate  | Expected Throughput | Throughput Difference |
  +==========+============+=========+============+========+=====================+=======================+
  | 1C/1T    | 64         | 512     | 9.842 Mpps | 3.307% | 0.000 Mpps          | 9.842 Mpps            |
  +----------+------------+---------+------------+--------+---------------------+-----------------------+
after:
  +----------+------------+---------+-----------+--------+---------------+-----------------+--------+
  | Fwd_core | Frame Size | TXD/RXD | Real-Mpps |  Rate  | Expected-Mpps | Real - Expected | Status |
  +==========+============+=========+===========+========+===============+=================+========+
  | 1C/1T    | 64         | 512     | 9.864     | 3.314% | 0             | 9.864           | PASS   |
  +----------+------------+---------+-----------+--------+---------------+-----------------+--------+

Signed-off-by: Lijuan Tu <lijuan.tu@intel.com>
---
 tests/TestSuite_nic_single_core_perf.py | 28 +++++++++++++------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/tests/TestSuite_nic_single_core_perf.py b/tests/TestSuite_nic_single_core_perf.py
index a0a257dd..095b508a 100644
--- a/tests/TestSuite_nic_single_core_perf.py
+++ b/tests/TestSuite_nic_single_core_perf.py
@@ -120,8 +120,8 @@ class TestNicSingleCorePerf(TestCase):
         self.gap = self.get_suite_cfg()['accepted_tolerance']
 
         # header to print test result table
-        self.table_header = ['Fwd_core', 'Frame Size', 'TXD/RXD', 'Throughput', 'Rate',
-                             'Expected Throughput', 'Throughput Difference']
+        self.table_header = ['Fwd_core', 'Frame Size', 'TXD/RXD', 'Real-Mpps', 'Rate',
+                             'Expected-Mpps', 'Real - Expected', 'Status']
         self.test_result = {}
 
     def flows(self):
@@ -327,15 +327,17 @@ class TestNicSingleCorePerf(TestCase):
                     ret_data[header[0]] = fwd_config
                     ret_data[header[1]] = frame_size
                     ret_data[header[2]] = nb_desc
-                    ret_data[header[3]] = "{:.3f} Mpps".format(
-                        self.throughput[fwd_config][frame_size][nb_desc])
-                    ret_data[header[4]] = "{:.3f}%".format(
-                        self.throughput[fwd_config][frame_size][nb_desc] * 100 / wirespeed)
-                    ret_data[header[5]] = "{:.3f} Mpps".format(
-                        self.expected_throughput[fwd_config][frame_size][nb_desc])
-                    ret_data[header[6]] = "{:.3f} Mpps".format(
-                        self.throughput[fwd_config][frame_size][nb_desc] -
-                            self.expected_throughput[fwd_config][frame_size][nb_desc])
+                    _real = self.throughput[fwd_config][frame_size][nb_desc]
+                    _exp = self.expected_throughput[fwd_config][frame_size][nb_desc]
+                    ret_data[header[3]] = "{:.3f}".format(_real)
+                    ret_data[header[4]] = "{:.3f}%".format(_real * 100 / wirespeed)
+                    ret_data[header[5]] = "{:.3f}".format(_exp)
+                    delta = _real - _exp
+                    ret_data[header[6]] = "{:.3f}".format(delta)
+                    if delta > -self.gap:
+                        ret_data[header[7]] = 'PASS'
+                    else:
+                        ret_data[header[7]] = 'FAIL'
 
                     ret_datas[frame_size][nb_desc] = deepcopy(ret_data)
                 self.test_result[fwd_config] = deepcopy(ret_datas)
@@ -374,8 +376,8 @@ class TestNicSingleCorePerf(TestCase):
                     row_dict0 = dict()
                     row_dict0['performance'] = list()
                     row_dict0['parameters'] = list()
-                    result_throughput = float(row_in['Throughput'].split()[0])
-                    expected_throughput = float(row_in['Expected Throughput'].split()[0])
+                    result_throughput = float(row_in['Real-Mpps'])
+                    expected_throughput = float(row_in['Expected-Mpps'])
                     # delta value and accepted tolerance in percentage
                     delta = result_throughput - expected_throughput
                     if delta > -self.gap:
-- 
2.25.1

[dts] [v2 4/6] tests/nic_single_core_perf: revise delta to ratio

[Lijuan Tu]

the delta used to difines the difference between real pps and expeced
pps, the case fails if it exceed the absolute number specified by
'accepted_tolerance' in conf/nic_single_core_perf.cfg, the deault is
1Mpps, which is not friendly when the expeced is only a few of million,
so updated the accepted_tolerance to a percentage, considering the CI
intergation, so the type is float.

Here are main changes:
* the meaning of accepted_tolerance
    before: threshold for (real-mpps - expected-mpps)
    after: threshold for (real-mpps - expected-mpps)/expected-mpps
* Pass criteria
    before:
      real-mpps - expected-mpps > -accepted_tolerance
    after:
      (real-mpps - expected-mpps)/expected-mpps > -accepted_tolerance
* rst table
    before:
      ... +---------------+-----------------+--------+
      ... | Expected-Mpps | Real - Expected | Status |
      ... +===============+=================+========+
      ... | 9.900         | -0.040          | PASS   |
      ... +---------------+-----------------+--------+

    after:
      ... +---------------+------------+--------+
      ... | Expected-Mpps | Fluc Ratio | Status |
      ... +===============+============+========+
      ... | 9.900         | -0.004     | PASS   |
      ... +---------------+------------+--------+
* delta in JSON:
    before: real-mpps - expected-mpps
    after: (real-mpps - expected-mpps)/expected-mpps

Signed-off-by: Lijuan Tu <lijuan.tu@intel.com>
---
 conf/nic_single_core_perf.cfg           | 10 +++++---
 tests/TestSuite_nic_single_core_perf.py | 32 ++++++++++++-------------
 2 files changed, 22 insertions(+), 20 deletions(-)

diff --git a/conf/nic_single_core_perf.cfg b/conf/nic_single_core_perf.cfg
index e6b0a5af..72b8c533 100644
--- a/conf/nic_single_core_perf.cfg
+++ b/conf/nic_single_core_perf.cfg
@@ -11,8 +11,12 @@
 #  - test_duration is how many seconds each combination performance will
 #  be recorded.
 #
-#  - accepted_tolerance defines the accepted tolerance between test
-# results and expected numbers.
+#  - accepted_tolerance defines the accepted tolerance for the
+#  fluctuation ratio of performance, it is a float(e.g. 0.05).
+#  Assume:
+#    F = (Real-Mpps - Expected-Mpps)/Expected-Mpps
+#    T = accepted_tolerance
+#  If F < -T, the case is PASS, else it is FAIL
 #
 #  - expected_throughput is a dictionary defining expected throughput
 # numbers based on NIC, and the pattern is
@@ -38,7 +42,7 @@ test_parameters = {'1C/1T': {64: [512, 2048]},
 rx_desc_16byte = 'y'
 test_duration = 60
 throughput_stat_sample_interval = 2
-accepted_tolerance = 1
+accepted_tolerance = 0.05
 expected_throughput = {
     'fortville_spirit': {
         '1C/1T': {64: {512: 0.00, 2048: 0.00}},
diff --git a/tests/TestSuite_nic_single_core_perf.py b/tests/TestSuite_nic_single_core_perf.py
index 095b508a..dd35caac 100644
--- a/tests/TestSuite_nic_single_core_perf.py
+++ b/tests/TestSuite_nic_single_core_perf.py
@@ -116,12 +116,12 @@ class TestNicSingleCorePerf(TestCase):
         # {'$framesize':{"$nb_desc": 'throughput'}
         self.throughput = {}
 
-        # Accepted tolerance in Mpps
-        self.gap = self.get_suite_cfg()['accepted_tolerance']
+        # Accepted tolerance is ratio
+        self.gap = self.get_suite_cfg().get('accepted_tolerance', 0.1)
 
         # header to print test result table
         self.table_header = ['Fwd_core', 'Frame Size', 'TXD/RXD', 'Real-Mpps', 'Rate',
-                             'Expected-Mpps', 'Real - Expected', 'Status']
+                             'Expected-Mpps', 'Fluc Ratio', 'Status']
         self.test_result = {}
 
     def flows(self):
@@ -332,12 +332,16 @@ class TestNicSingleCorePerf(TestCase):
                     ret_data[header[3]] = "{:.3f}".format(_real)
                     ret_data[header[4]] = "{:.3f}%".format(_real * 100 / wirespeed)
                     ret_data[header[5]] = "{:.3f}".format(_exp)
-                    delta = _real - _exp
-                    ret_data[header[6]] = "{:.3f}".format(delta)
-                    if delta > -self.gap:
-                        ret_data[header[7]] = 'PASS'
+                    delta = (_real - _exp)/_exp
+                    if _exp != 0:
+                        ret_data[header[6]] = "{:.3f}".format(delta)
+                        if delta > -self.gap:
+                            ret_data[header[7]] = 'PASS'
+                        else:
+                            ret_data[header[7]] = 'FAIL'
                     else:
-                        ret_data[header[7]] = 'FAIL'
+                        ret_data[header[6]] = "N/A"
+                        ret_data[header[7]] = 'PASS'
 
                     ret_datas[frame_size][nb_desc] = deepcopy(ret_data)
                 self.test_result[fwd_config] = deepcopy(ret_datas)
@@ -376,15 +380,9 @@ class TestNicSingleCorePerf(TestCase):
                     row_dict0 = dict()
                     row_dict0['performance'] = list()
                     row_dict0['parameters'] = list()
-                    result_throughput = float(row_in['Real-Mpps'])
-                    expected_throughput = float(row_in['Expected-Mpps'])
-                    # delta value and accepted tolerance in percentage
-                    delta = result_throughput - expected_throughput
-                    if delta > -self.gap:
-                        row_dict0['status'] = 'PASS'
-                    else:
-                        row_dict0['status'] = 'FAIL'
-                    row_dict1 = dict(name="Throughput", value=result_throughput, unit="Mpps", delta=delta)
+                    row_dict0['status'] = row_in['Status']
+                    row_dict1 = dict(name="Throughput", value=row_in['Real-Mpps'], unit="Mpps",
+                                     delta=row_in['Fluc Ratio'])
                     row_dict2 = dict(name="Txd/Rxd", value=row_in["TXD/RXD"], unit="descriptor")
                     row_dict3 = dict(name="frame_size", value=row_in["Frame Size"], unit="bytes")
                     row_dict4 = dict(name="Fwd_core", value=row_in["Fwd_core"])
-- 
2.25.1

[dts] [v2 5/6] tests/nic_single_core_perf: add expected mpps into JSON

[Lijuan Tu]

expose more perf info for CI analysis.

Signed-off-by: Lijuan Tu <lijuan.tu@intel.com>
---
 tests/TestSuite_nic_single_core_perf.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/TestSuite_nic_single_core_perf.py b/tests/TestSuite_nic_single_core_perf.py
index dd35caac..8606f599 100644
--- a/tests/TestSuite_nic_single_core_perf.py
+++ b/tests/TestSuite_nic_single_core_perf.py
@@ -382,7 +382,7 @@ class TestNicSingleCorePerf(TestCase):
                     row_dict0['parameters'] = list()
                     row_dict0['status'] = row_in['Status']
                     row_dict1 = dict(name="Throughput", value=row_in['Real-Mpps'], unit="Mpps",
-                                     delta=row_in['Fluc Ratio'])
+                                     delta=row_in['Fluc Ratio'], expected=row_in['Expected-Mpps'])
                     row_dict2 = dict(name="Txd/Rxd", value=row_in["TXD/RXD"], unit="descriptor")
                     row_dict3 = dict(name="frame_size", value=row_in["Frame Size"], unit="bytes")
                     row_dict4 = dict(name="Fwd_core", value=row_in["Fwd_core"])
-- 
2.25.1

[dts] [v2 6/6] tests/nic_single_core_perf: revise rx desc size

[Lijuan Tu]

rx_desc_16byte uses  'y' indicates the rx descriptor size to 16B, and
other string for 32B. but 'y' is a reserved string in INI, misuse it
will casuse the wirte-back configurattion file can't be read correctly.
so rename rx_desc_16byte to rx_desc_size and the type is integer.

Signed-off-by: Lijuan Tu <lijuan.tu@intel.com>
---
 conf/nic_single_core_perf.cfg           |  4 +++-
 tests/TestSuite_nic_single_core_perf.py | 17 +++++++++--------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/conf/nic_single_core_perf.cfg b/conf/nic_single_core_perf.cfg
index 72b8c533..7970995e 100644
--- a/conf/nic_single_core_perf.cfg
+++ b/conf/nic_single_core_perf.cfg
@@ -5,6 +5,8 @@
 # numbers, and the pattern is
 #    {'frame size': ['descriptor number #1', 'descriptor number #2']}
 #
+#  - rx_desc_size defines the rx descriptor size which is 16B or 32B.
+#
 #  - throughput_stat_sample_interval defines interval of get throughput
 #  statistics (second). If not set, it is 5 seconds by default.
 #
@@ -39,7 +41,7 @@
 update_expected = True
 test_parameters = {'1C/1T': {64: [512, 2048]},
                     '1C/2T': {64: [512, 2048]}}
-rx_desc_16byte = 'y'
+rx_desc_size = 16
 test_duration = 60
 throughput_stat_sample_interval = 2
 accepted_tolerance = 0.05
diff --git a/tests/TestSuite_nic_single_core_perf.py b/tests/TestSuite_nic_single_core_perf.py
index 8606f599..ee022054 100644
--- a/tests/TestSuite_nic_single_core_perf.py
+++ b/tests/TestSuite_nic_single_core_perf.py
@@ -58,13 +58,15 @@ class TestNicSingleCorePerf(TestCase):
                                  "Not required NIC ")
         self.headers_size = HEADER_SIZE['eth'] + HEADER_SIZE['ip']
 
-        self.rx_desc = self.get_suite_cfg()['rx_desc_16byte']
-        if 'y' == self.rx_desc:
+        self.rx_desc_size = self.get_suite_cfg().get('rx_desc_size', 32)
+        err_msg = "Rx desc only has 16B and 32B size, %d is not valid" % self.rx_desc_size
+        self.verify(self.rx_desc_size == 16 or self.rx_desc_size == 32, err_msg)
+        if self.rx_desc_size == 16:
             # Update DPDK config file and rebuild to get best perf on fortville
             if self.nic in ["fortville_25g", "fortville_spirit"]:
-                self.dut.set_build_options({'RTE_LIBRTE_I40E_16BYTE_RX_DESC': self.rx_desc})
+                self.dut.set_build_options({'RTE_LIBRTE_I40E_16BYTE_RX_DESC': 'y'})
             elif self.nic in ["columbiaville_100g", "columbiaville_25g", "columbiaville_25gx2"]:
-                self.dut.set_build_options({'RTE_LIBRTE_ICE_16BYTE_RX_DESC': self.rx_desc})
+                self.dut.set_build_options({'RTE_LIBRTE_ICE_16BYTE_RX_DESC': 'y'})
             self.dut.build_install_dpdk(self.target)
 
         # Based on h/w type, choose how many ports to use
@@ -417,11 +419,10 @@ class TestNicSingleCorePerf(TestCase):
         Run after each test suite.
         """
         # resume setting
-        if 'y' == self.rx_desc:
-            self.rx_desc = 'n'
+        if self.rx_desc_size == 16:
             if self.nic in ["fortville_25g", "fortville_spirit"]:
-                self.dut.set_build_options({'RTE_LIBRTE_I40E_16BYTE_RX_DESC': self.rx_desc})
+                self.dut.set_build_options({'RTE_LIBRTE_I40E_16BYTE_RX_DESC': 'n'})
             elif self.nic in ["columbiaville_100g", "columbiaville_25g", "columbiaville_25gx2"]:
-                self.dut.set_build_options({'RTE_LIBRTE_ICE_16BYTE_RX_DESC': self.rx_desc})
+                self.dut.set_build_options({'RTE_LIBRTE_ICE_16BYTE_RX_DESC': 'n'})
             self.dut.build_install_dpdk(self.target)
         self.dut.kill_all()
-- 
2.25.1

Re: [dts] [v2 0/6] revise tests/nic_signle_core_perf

[Tu, Lijuan]

> -----Original Message-----
> From: Tu, Lijuan <lijuan.tu@intel.com>
> Sent: 2021年3月31日 17:34
> To: dliu@iol.unh.edu; ohilyard@iol.unh.edu; alialnu@nvidia.com
> Cc: dts@dpdk.org; Tu, Lijuan <lijuan.tu@intel.com>
> Subject: [v2 0/6] revise tests/nic_signle_core_perf
> 
> * changed pass / fail determination to be percentage based
> * made multiple traffic measurements during the test run to
>   collect better statistics

Applied with typos fixed.