# under the License.
from traffic_base import AbstractTrafficGenerator
+import traffic_utils as utils
class DummyTG(AbstractTrafficGenerator):
Useful for unit testing without actually generating any traffic.
"""
- def __init__(self, runner):
- AbstractTrafficGenerator.__init__(self, runner)
+ def __init__(self, config):
+ AbstractTrafficGenerator.__init__(self, config)
self.port_handle = []
self.rates = []
+ self.l2_frame_size = 0
+ self.duration_sec = self.config.duration_sec
+ self.intf_speed = config.generator_config.intf_speed
def get_version(self):
return "0.1"
def init(self):
pass
+ def get_tx_pps_dropped_pps(self, tx_rate):
+ '''Get actual tx packets based on requested tx rate
+
+ :param tx_rate: requested TX rate with unit ('40%', '1Mbps', '1000pps')
+
+ :return: the actual TX pps and the dropped pps corresponding to the requested TX rate
+ '''
+ dr, tx = self.__get_dr_actual_tx(tx_rate)
+ actual_tx_bps = utils.load_to_bps(tx, self.intf_speed)
+ avg_packet_size = utils.get_average_packet_size(self.l2_frame_size)
+ tx_packets = utils.bps_to_pps(actual_tx_bps, avg_packet_size)
+
+ dropped = tx_packets * dr / 100
+ # print '===get_tx_pkts_dropped_pkts req tex=', tx_rate, 'dr=', dr,
+ # 'actual tx rate=', tx, 'actual tx pkts=', tx_packets, 'dropped=', dropped
+ return int(tx_packets), int(dropped)
+
+ def set_response_curve(self, lr_dr=0, ndr=100, max_actual_tx=100, max_11_tx=100):
+ '''Set traffic gen response characteristics
+
+ Specifies the drop rate curve and the actual TX curve
+ :param float lr_dr: The actual drop rate at TX line rate (in %, 0..100)
+ :param float ndr: The true NDR (0 packet drop) in % (0..100) of line rate"
+ :param float max_actual_tx: highest actual TX when requested TX is 100%
+ :param float max_11_tx: highest requested TX that results in same actual TX
+ '''
+ self.target_ndr = ndr
+ if ndr < 100:
+ self.dr_slope = float(lr_dr) / (100 - ndr)
+ else:
+ self.dr_slope = 0
+ self.max_11_tx = max_11_tx
+ self.max_actual_tx = max_actual_tx
+ if max_11_tx < 100:
+ self.tx_slope = float(max_actual_tx - max_11_tx) / (100 - max_11_tx)
+ else:
+ self.tx_slope = 0
+
+ def __get_dr_actual_tx(self, requested_tx_rate):
+ '''Get drop rate at given requested tx rate
+ :param float requested_tx_rate: requested tx rate in % (0..100)
+ :return: the drop rate and actual tx rate at that requested_tx_rate in % (0..100)
+ '''
+ if requested_tx_rate <= self.max_11_tx:
+ actual_tx = requested_tx_rate
+ else:
+ actual_tx = self.max_11_tx + (requested_tx_rate - self.max_11_tx) * self.tx_slope
+ if actual_tx <= self.target_ndr:
+ dr = 0.0
+ else:
+ dr = (actual_tx - self.target_ndr) * self.dr_slope
+ return dr, actual_tx
+
def connect(self):
ports = list(self.config.generator_config.ports)
self.port_handle = ports
pass
def create_traffic(self, l2frame_size, rates, bidirectional, latency=True):
- pass
+ self.rates = [utils.to_rate_str(rate) for rate in rates]
+ self.l2_frame_size = l2frame_size
def clear_streamblock(self):
pass
def get_stats(self):
+ '''Get stats from current run.
+
+ The binary search mainly looks at 2 results to make the decision:
+ actual tx packets
+ actual rx dropped packets
+ From the Requested TX rate - we get the Actual TX rate and the RX drop rate
+ From the Run duration and actual TX rate - we get the actual total tx packets
+ From the Actual tx packets and RX drop rate - we get the RX dropped packets
+ '''
result = {}
- for ph in self.port_handle:
+ total_tx_pps = 0
+
+ # use dummy values for all other result field as the goal is to
+ # test the ndr/pdr convergence code
+ for idx, ph in enumerate(self.port_handle):
+ requested_tx_rate = utils.get_load_from_rate(self.rates[idx])
+ tx_pps, dropped_pps = self.get_tx_pps_dropped_pps(requested_tx_rate)
+
+ # total packets sent per direction - used by binary search
+ total_pkts = tx_pps * self.duration_sec
+ dropped_pkts = dropped_pps * self.duration_sec
+ _, tx_pkt_rate = self.__get_dr_actual_tx(requested_tx_rate)
result[ph] = {
'tx': {
- 'total_pkts': 1000,
+ 'total_pkts': total_pkts,
'total_pkt_bytes': 100000,
- 'pkt_rate': 100,
+ 'pkt_rate': tx_pkt_rate,
'pkt_bit_rate': 1000000
},
'rx': {
- 'total_pkts': 1000,
+ # total packets received
+ 'total_pkts': total_pkts - dropped_pkts,
'total_pkt_bytes': 100000,
'pkt_rate': 100,
'pkt_bit_rate': 1000000,
- 'dropped_pkts': 0
+ 'dropped_pkts': dropped_pkts
}
}
result[ph]['rx']['max_delay_usec'] = 10.0
result[ph]['rx']['min_delay_usec'] = 1.0
result[ph]['rx']['avg_delay_usec'] = 2.0
+ total_tx_pps += tx_pps
+ # actual total tx rate in pps
+ result['total_tx_rate'] = total_tx_pps
return result
def clear_stats(self):
Code Review / nfvbench.git / blobdiff