Watch PPS for a given interface

watch_pps.sh

#!/bin/bash

[ -z $1 ] && { echo "usage: $0 [iface] [interval: default 1]"; exit 1; }

IFACE=$1
INTERVAL=${2:-1}
loop=1

PPS_RX=/sys/class/net/${IFACE}/statistics/rx_packets
PPS_TX=/sys/class/net/${IFACE}/statistics/tx_packets

trap _exit INT

function _exit() {
  END_PPS_RX=$(cat $PPS_RX)
  END_PPS_TX=$(cat $PPS_TX)
  TOTAL_PPS_RX=$((END_PPS_RX - START_PPS_RX))
  TOTAL_PPS_TX=$((END_PPS_TX - START_PPS_TX))
  echo
  echo "PPS RX TOTAL/AVG: ${TOTAL_PPS_RX}/$((TOTAL_PPS_RX / loop))"
  echo "PPS TX TOTAL/AVG: ${TOTAL_PPS_TX}/$((TOTAL_PPS_TX / loop))"
  exit
}

START_PPS_RX=$(cat $PPS_RX)
START_PPS_TX=$(cat $PPS_TX)

while true; do
  RX1=$(cat $PPS_RX)
  TX1=$(cat $PPS_TX)
  sleep $INTERVAL
  RX2=$(cat $PPS_RX)
  TX2=$(cat $PPS_TX)
  echo "${loop}: ${IFACE}: TX $(((TX2-TX1)/INTERVAL)) pps | RX $(((RX2-RX1)/INTERVAL)) pps"
  let loop=$((loop+INTERVAL))
done