009_系统参数调优

一、调优实战

 

二、

bdns

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# sysctl settings are defined through files in # /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/. # # Vendors settings live in /usr/lib/sysctl.d/. # To override a whole file, create a new file with the same in # /etc/sysctl.d/ and put new settings there. To override # only specific settings, add a file with a lexically later # name in /etc/sysctl.d/ and put new settings there. # # For more information, see sysctl.conf(5) and sysctl.d(5). # Controls IP packet forwarding net.ipv4.ip_forward = 0    # Controls source route verification net.ipv4.conf.default.rp_filter = 1    # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0    # Controls the System Request debugging functionality of the kernel kernel.sysrq = 0    # Controls whether core dumps will append the PID to the core filename. # Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1    # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1    # Controls the default maxmimum size of a mesage queue kernel.msgmnb = 65536    # Controls the maximum size of a message, in bytes kernel.msgmax = 65536    # Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736    # Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296    net.ipv4.ip_local_port_range = 10000  65535    net.ipv4.tcp_tw_reuse = 1    net.ipv4.tcp_syncookies = 1    net.ipv6.conf.default.disable_ipv6=1 net.ipv6.conf.all.disable_ipv6=1    #baidu net.ipv4.tcp_mem = 4632768      6177024 9265536 net.ipv4.tcp_wmem = 4096        2500000 8388608 net.ipv4.tcp_rmem = 4096        2500000 8388608 net.core.wmem_max = 5000000 net.core.rmem_max = 5000000 net.core.netdev_max_backlog = 65535 net.core.somaxconn = 65535

zb1

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# For more information, see sysctl.conf(5) and sysctl.d(5). net.ipv4.neigh.default.gc_stale_time=120 net.ipv4.conf.default.rp_filter=0 net.ipv4.conf.all.rp_filter=0 net.ipv4.conf.all.arp_announce=2 net.ipv4.conf.lo.arp_announce=2 kernel.sysrq=1 net.ipv4.tcp_synack_retries=2 net.core.rmem_default=8388608 net.ipv4.tcp_mem=12582912 12582912 12582912 net.ipv4.tcp_congestion_control=cubic net.ipv4.tcp_keepalive_probes=2 kernel.sem=5010 641280 5010 300 net.core.wmem_default=8388608 net.ipv4.tcp_syn_retries=1 net.ipv4.tcp_slow_start_after_idle=0 net.ipv6.conf.all.disable_ipv6=1 vm.max_map_count=262144 net.ipv4.tcp_window_scaling=1 net.ipv4.tcp_keepalive_time=300 net.nf_conntrack_max=2097152 net.ipv4.tcp_no_metrics_save=1 net.ipv4.tcp_moderate_rcvbuf=1 net.core.rmem_max=16777216 fs.file-max=655360 net.core.somaxconn=65535 net.ipv4.tcp_max_syn_backlog=3240000 net.ipv4.tcp_tw_reuse=1 net.ipv4.tcp_timestamps=1 net.ipv4.tcp_max_tw_buckets=262144 net.ipv4.ip_local_reserved_ports=29090,29091,29098,29081,29097,29093,29099,29200,29101,27000,28000,22223,22222,26501,26502,26503,26401,29500-29600 net.ipv4.tcp_rmem=4096 87380 16777216 net.ipv4.tcp_retries2=5 net.ipv4.tcp_keepalive_intvl=15 net.ipv4.tcp_wmem=4096 65536 16777216 net.core.wmem_max=16777216 vm.swappiness=0 net.core.netdev_max_backlog=65535 net.netfilter.nf_conntrack_max=2097152 net.ipv4.tcp_syncookies=1 net.ipv4.tcp_fin_timeout=10 net.ipv4.ip_local_port_range=20000 64999 net.ipv4.tcp_tw_recycle=0 net.ipv6.conf.default.disable_ipv6=1 net.ipv6.conf.lo.disable_ipv6=1 net.ipv4.tcp_fastopen=1

参考:https://colobu.com/2014/09/18/linux-tcpip-tuning/

三、TCP监控

(1)In Segs

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1 2	数据源: /proc/net/snmp; 采集方式：累计值，每10秒采集一次取差值； 指标：net.snmp.tcp (key: system); In Segs: tcp协议层收到的数据包个数, in_segs/10 -> op/s;