作者：【吴业亮】
博客：https://wuyeliang.blog.csdn.net/
为了能充分发挥Nginx的性能，用户可对系统内核参数做一些调整。
net.ipv4.ip_forward=0
net.ipv4.conf.default.rp_filter=1
net.ipv4.conf.default.accept_source_route=0
kernel.sysrq=0kernel.core_uses_pid=1
net.ipv4.tcp_syncookies=1
kernel.msgmnb=65536
kernel.msgmax=65536
kernel.shmmax=68719476736
kernel.shmall=4294967296
net.ipv4.tcp_max_tw_buckets=6000
net.ipv4.tcp_sack=1
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_rmem=4096 87380 4194304
net.ipv4.tcp_wmem=4096 16384 4194304
net.core.wmem_default=8388608
net.core.rmem_default=8388608
net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.core.netdev_max_backlog=262144
net.core.somaxconn=262144
net.ipv4.tcp_max_orphans=3276800
net.ipv4.tcp_max_syn_backlog=262144
net.ipv4.tcp_timestamps=0
net.ipv4.tcp_synack_retries=1
net.ipv4.tcp_syn_retries=1
net.ipv4.tcp_tw_recycle=1
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_mem=94500000 915000000 927000000
net.ipv4.tcp_fin_timeout=1
net.ipv4.tcp_keepalive_time=30
net.ipv4.ip_local_port_range=1024 65000
