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Ò»¡¢Ïàʶtcp tw_reuse

TCPÅþÁ¬ÊÇÒ»ÖÖÃæÏòÅþÁ¬µÄ´«ÊäЭÒ飬Òò´ËIPµØµãºÍ¶Ë¿Ú×éºÏ±ØÐè²î±ð²Å»ª½¨ÉèÐÂÅþÁ¬¡£ÔÚ¿Í»§¶ËÓëЧÀÍÆ÷ÒѾ­¹Ø±Õ£¬µ«LinuxÈÔÔÚÆÚ´ý¿ÉÄÜ×î½ü½¨ÉèÅþÁ¬µÄÒ»¶Îʱ¼äÖ®ºó£¬»áʵÑ齨ÉètcpÅþÁ¬¡£Õâһʱ¼ä¶Î±»³ÆΪ¡°TIME_WAIT¡±×´Ì¬£¬´Ë״̬ϵÄÅþÁ¬²»¿É±»¸´Óá£ÕâÖÖÐÐΪ»á¼õ»ºÐ§ÀÍÆ÷µÄTCP/IPÐÔÄÜ¡£

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echo 1 >/proc/sys/net/ipv4/tcp_tw_reuse

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TCP keepaliveÊÇÒ»ÖÖ»úÖÆ£¬Äܹ»¼ì²âÅþÁ¬ÊÇ·ñÈÔÈ»´¦ÓÚÔ˶¯×´Ì¬£¬ÒÔ¼°±ÜÃâÓÉÓÚÍøÂçÓµÈûÎÊÌâÔì³ÉÅþÁ¬É¥Ê§¡£TCP keepalive°´ÆÚ¼ì²éÅþÁ¬×´Ì¬£¬ÒÔÈ·¶¨ÅþÁ¬ÊÇ·ñÈÔ´¦ÓÚÔ˶¯×´Ì¬£¬ÈôÊDz»ÊÇ£¬Ôò¹Ø±ÕÅþÁ¬¡£

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1.tcp_keepalive_time

tcp_keepalive_time²ÎÊý½ç˵ÔÚ·¢Ëͼá³ÖÔ˶¯??±¨ÎÄÖ®¼äµÄʱ¼ä¾àÀë¡£ÈôÊÇÍøÂçÖеÄÒ»¸ö½ÚµãÎÞ·¨ÏìÓ¦£¬Ôòkeepalive»úÖÆ»áʵÑéÖØн¨ÉèÅþÁ¬¡£

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2.tcp_keepalive_intvl

tcp_keepalive_intvl²ÎÊý½ç˵ÁË·¢Ëͼá³ÖÔ˶¯±¨ÎÄÖ®ºóµÄÖØÊÔʱ¼ä¾àÀë¡£

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3.tcp_keepalive_probes

tcp_keepalive_probes½ç˵ÁËÔÚ·¢ËÍkeepalive±¨ÎÄ֮ǰ¾ÙÐÐÒ»ÔÙTCP̽²â¡£

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echo 600 >/proc/sys/net/ipv4/tcp_keepalive_time
echo 30 >/proc/sys/net/ipv4/tcp_keepalive_intvl
echo 5 >/proc/sys/net/ipv4/tcp_keepalive_probes

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TCP´°¿ÚÀ©Õ¹£¨TCP Window Scaling£©ÊÇÒ»ÖÖÀ©Õ¹TCPÍ·²¿µÄÑ¡ÏÒÔÖ§³Ö¸ßËÙÍøÂ硣ĬÈÏÇéÐÎÏ£¬LinuxÄں˻á×Ô¶¯ÆôÓÃTCP´°¿ÚÀ©Õ¹Ñ¡Ïµ«ÈôÊÇÄúʹÓõÄÊǽϾɰ汾µÄÄںˣ¬Ôò¿ÉÄÜÐèÒªÆôÓøÃÑ¡Ïî¡£

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echo 1 >/proc/sys/net/ipv4/tcp_window_scaling

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ifconfig eth0 mtu 9000
ifconfig eth0 mru 9000

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iperf3 -s

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iperf3 -c <server-ip>

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netstatÏÂÁîÊÇÒ»¸ö³£ÓõÄÏÂÁîÐй¤¾ß£¬¿ÉÓÃÓÚ¼ì²éLinuxϵͳÖеÄÍøÂçÅþÁ¬ºÍ´«ÊäÐÔÄÜ¡£

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netstat -nat | grep -i "tcp.*established"

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sysctlÊÇÒ»¸öÖÎÀíÄں˲ÎÊýµÄCLIÊÊÓóÌÐò¡£¿ÉÒÔʹÓÃËüÀ´Éó²éºÍ¸ü¸ÄTCP/IP²ÎÊý¡£

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sysctl -a | grep tcp

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sysctl -w <parameter=value>

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sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

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tcpdumpÊÇÒ»ÖÖץȡÍøÂçÊý¾Ý°üµÄÏÂÁîÐÐÊÊÓù¤¾ß¡£¿ÉÒÔʹÓÃËüÀ´¼à¿ØÍøÂçÁ÷Á¿£¬ÒÔ²éÕÒÍøÂç¹ÊÕÏ»òÆ¿¾±¡£

ÒÔÏÂÊÇʹÓÃtcpdumpÏÂÁ»ñÈëÕ¾ºÍ³öÕ¾TCPÁ÷Á¿µÄÏÂÁ

tcpdump -i eth0 -vv tcp

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tcpdump -i eth0 -vv tcp -w <filename>
wireshark <filename>

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