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04-16-2018 07:57 PM
04-16-2018 07:57 PM
FIN_WAIT_2
Hello
Sorry for my ENGLISH
My servers TTFB (time to first byte) is so slow. So I want tuning my OS. I checked TCP connection states :
# netstat -an | grep FIN_WAIT_2 |wc -l 581 # netstat -an | grep ESTABLISHED |wc -l 108 # netstat -an | grep FIN_WAIT_1 |wc -l 0 # netstat -an | grep TIME_WAIT |wc -l 63
After I checked network TCP statistic using netstat -s
tcp: 2868640068 packets sent 2078552380 data packets (2129803775735 bytes) 2353614 data packets (2648175685 bytes) retransmitted 687746533 ack-only packets (166397695 delayed) 0 URG only packets 718191 window probe packets 2282086 window update packets 102342253 control packets 2858485493 packets received 1129519799 acks (for 2129768520155 bytes) 10175391 duplicate acks 0 acks for unsent data 1857162700 packets (2652760502304 bytes) received in-sequence 0 completely duplicate packets (0 bytes) 918 packets with some dup data (1212427 bytes duped) 1281124 out of order packets (2093417358 bytes) 0 packets (0 bytes) of data after window 174885 window probes 103083764 window update packets 2379739 packets received after close 0 segments discarded for bad checksum 0 bad TCP segments dropped due to state change 3800683 connection requests 34853750 connection accepts 38654433 connections established (including accepts) 39058582 connections closed (including 404257 drops) 254697 embryonic connections dropped 1072540096 segments updated rtt (of 1072540096 attempts) 420890 retransmit timeouts 7197 connections dropped by rexmit timeout 718191 persist timeouts 16520892 keepalive timeouts 16493808 keepalive probes sent 14491 connections dropped by keepalive 0 connect requests dropped due to full queue 3753439 connect requests dropped due to no listener
What do you think about this results ? Need to change some options ? such as tcp_kepalive, tcp_fin_wait_2_timeout
Thanks
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