Ad-hoc monitoring for time_squeeze changes in /proc/net/softnet_stat

softnetstat.py

#!/usr/bin/env python3
#
# Ad-hoc monitoring for time_squeeze changes in /proc/net/softnet_stat .
#
# usage: ./softnetstat.py <refresh_interval_seconds>
#
# see https://blog.packagecloud.io/eng/2016/06/22/monitoring-tuning-linux-networking-stack-receiving-data/
# 
from time import sleep
from datetime import datetime
import sys
FILE='/proc/net/softnet_stat'
def process(file):
    s = 0
    with open(file) as f:
        lines = f.readlines()
    for line in lines:
        vals = line.split(' ')
        s += int(vals[2],16)
    return s
def main(interval):
    print('timestamp\t\tdelta\tcur\tprev')
    prev = 0 #float('Inf') 
    while True:
        cur = process(FILE)
        delta = cur-prev
        timestamp = datetime.now().replace(microsecond=0).isoformat()
        if delta>0:
            print('{0}\t{1}\t{2}\t{3}'.format(timestamp,delta, cur, prev), flush=True)
        sleep(interval)
        prev = cur
if __name__ == '__main__':
    if len(sys.argv) < 2:
        interval = 1
    else:
        interval = int(sys.argv[1])
    main(interval)