Calculate prefetch deficit from Wireshark text export

clatency.py

import sys

for arg in sys.argv[1:]:
    acktimes = []
    prefetch = 0
    for line in open(arg).readlines():
        tokens = line.split()
        n, time, src, dest, protocol, length = tokens[0:6]
        summary = ' '.join(tokens[6:])
        acks = summary.count('Basic.Ack')
        if acks:
            acktimes.extend([float(time)] * acks)
            prefetch = prefetch - acks
        deliveries = summary.count('Basic.Deliver')
        if deliveries:
            prefetch = prefetch + deliveries
            acktimes = acktimes[deliveries:]

        if deliveries or acks:
            time = float(time)
            if len(acktimes):
                latency = time - min(acktimes)
            else:
                latency = 0
            print "{}\t{}\t{}\t{}\t{}".format(n, time, latency, prefetch, len(acktimes))

This should really write two separate files - one for the deficit and one for the latency. Also, I need to include TCP acks, one for each direction, so you can see when the recipient is blocking.