shell计算linux的tcp重传率（转录）

一个命令查看tcp重传率（只能得到分段式不能得到重传率）

[root@5ff230af28d2eae6d81bd6feace5fc5c ~]# nstat -az TcpRetransSegs
#kernel
TcpRetransSegs                  779756833          0.0

该脚本可配合定时任务执行

#!/bin/bash
export PATH='/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin'
SHELLDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

netstat -s -t > /tmp/netstat_s 2>/dev/null

s_r=`cat /tmp/netstat_s | grep 'segments send out' | awk '{print $1}'`
s_re=`cat /tmp/netstat_s  | grep 'segments retransmited' | awk '{print $1}'`

[ -e ${SHELLDIR}/s_r ] || touch ${SHELLDIR}/s_r
[ -e ${SHELLDIR}/s_re ] || touch ${SHELLDIR}/s_re

l_s_r=`cat ${SHELLDIR}/s_r`
l_s_re=`cat ${SHELLDIR}/s_re`

echo $s_r > ${SHELLDIR}/s_r
echo $s_re > ${SHELLDIR}/s_re
str_control=$(sysctl -n net.ipv4.tcp_congestion_control)
tcp_re_rate=`echo "$s_r $s_re $l_s_r $l_s_re" | awk '{printf("%.2f",($2-$4)/($1-$3)*100)}'`
echo $str_control":"$tcp_re_rate

echo $(date "+%Y-%m-%d %H:%M:%S") $str_control":"$tcp_re_rate  >> /root/tcpre.log

附、tcp重传率知识相关文章

https://blog.csdn.net/lonely_geek/article/details/121298324
https://blog.csdn.net/michaelwoshi/article/details/121189743