ss與netstat效率對比。ss更快些，且netstat在並發高於2萬情況下會有嚴重的卡頓現象

[[email protected] zabbix]#time ss state all|awk ‘{++S[$1]} END {for (a in S) {printf "%11-s %s\n",a,S[a]}}‘ #不是LL，是2個1

ESTAB 1

State 1

TIME-WAIT 5

LISTEN 13

real 0m0.005s

user 0m0.002s

sys 0m0.002s

[[email protected] zabbix]# time netstat -an|awk ‘/^tcp/ {++s[$NF]} END {for ( a in s ) {printf "%11

TIME_WAIT 9

ESTABLISHED 1

LISTEN 13

real 0m0.008s

user 0m0.002s

sys 0m0.004s

監控tcp連接狀態可查看/proc/net/tcp文件

[[email protected] zabbix]# tail -3 /proc/net/tcp #第4列綠色為tcp的各種狀態

5: 00000000:CE74 00000000:0000 0A 00000000:00000000 00:00000000 00000000 29 0 10581 1 ffff880036b42040 99 0 0 10 -1

6: 5100000A:8F4C 07AC2A79:0050 06 00000000:00000000 03:00000FA1 00000000 0 0 0 3 ffff88001de8aec0

7: 5100000A:0016 0100000A:D7D0 01 00000040:00000000 01:00000018 00000000 0 0 185660 4 ffff8800185bf180 24 3 21 6 4

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