系統核心如下：
centos6.8
[root@localhost ~]# uname -a
linux localhost.localdomain 2.6.32-642.el6.x86_64 #1 smp tue may 10 17:27:01 utc 2016 x86_64 x86_64 x86_64 gnu/linux
伺服器硬碟配置：
2顆cpu，單核12核心，開啟超執行緒
cpu型號：intel(r) xeon(r) cpu e5-2690 v3 @ 2.60ghz （41500元一台機器）
共計48執行緒的邏輯cpu
記憶體是96g
php程式都是短鏈結
優化如下：
[root@localhost ~]# cat /etc/sysctl.conf
net.ipv4.ip_forward= 0
kernel.sysrq = 0
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
vm.overcommit_memory = 1
net.ipv4.tcp_max_syn_backlog = 1638400
net.core.somaxconn = 1638400
net.core.netdev_max_backlog = 20000
net.ipv4.tcp_max_tw_buckets = 1800000
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_time = 90
net.ipv4.ip_local_port_range = 1024 65000
net.ipv4.tcp_window_scaling = 1
net.ipv4.icmp_echo_ignore_all = 0
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.tcp_sack = 0
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 30
net.ipv4.tcp_retries2 = 5
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_reordering = 5
net.ipv4.tcp_retrans_collapse = 0
net.ipv4.tcp_wmem = 51200 131072 4194304
net.ipv4.tcp_rmem = 51200 131072 4194304
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.netfilter.nf_conntrack_max = 655350
net.netfilter.nf_conntrack_tcp_timeout_established = 90
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 30
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 60
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 60
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