def send_and_count(pkt_size, gap_ms):
"""
Sends 1500 flows, each of FLOW_LENGTH packets of size pkt_size, and with gap_ms in
microseconds. Returns the number of rules in the TCAM and the software table.
"""
switch.reset_flow_table()
tcpdump.sniff_and_send(pkt_count_arg=FLOW_COUNT,
pkt_size_arg=pkt_size,
gap_ns_arg=gap_ms*(10**6),
flow_count_arg=FLOW_COUNT)
time.sleep(5)
flow_table = switch.dump_tables(filter='')
return (len(filter(lambda x: x.find('table_id=0') >=0, flow_table)),
len(filter(lambda x: x.find('table_id=2') >=0, flow_table)))
def run():
""" Main entry point. """
global _est_flow_length
global _steady_slice_start_seq_num, _steady_slice_end_seq_num
# Initialize global variables
state.flow_stat = {}
state.global_stat = {'recv_count': 0, 'recv_time': None,
'sent_count': None, 'sent_time': None,
'recv_start_time': None, 'recv_end_time': None,
'recv_bw_Mbps': None, 'sent_bw_Mbps': None}
_est_flow_length = None
_steady_slice_start_seq_num = None
_steady_slice_end_seq_num = None
# Start! Analyze packets.
tcpdump.sniff_and_send()
tcpdump.parse_pkt(_get_new_pkt)
print ''
# Analyze flows.
for flow_id in sorted(state.flow_stat.keys()):
_process_flow_stat(flow_id)
# Analyze aggregate.
g = state.global_stat
g['sent_time'] = state.pktgen_run_time
g['sent_count'] = state.pktgen_sent_pkt_count
g['recv_time'] = g['recv_end_time'] - g['recv_start_time']
g['recv_bw_Mbps'] = g['recv_count'] * config.pkt_size * 8 / g['recv_time'] / 1000000
g['sent_bw_Mbps'] = g['sent_count'] * config.pkt_size * 8 / g['sent_time'] / 1000000
