系統參數優化

cat /etc/sysctl.conf

kernel.shmall = 4294967296
net.ipv4.tcp_max_syn_backlog = 65535
net.core.netdev_max_backlog = 32768
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_max_tw_buckets = 20000
net.ipv4.tcp_keepalive_time = 1200
net.core.somaxconn = 32768
net.core.wmem_default = 12582912
net.core.wmem_max = 12582912
net.core.rmem_default = 12582912
net.core.rmem_max = 12582912
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.ip_local_port_range = 1024 65535
fs.file-max = 6553560
vm.swappiness = 10
vm.dirty_background_ratio=5
vm.dirty_ratio=10
vm.min_free_kbytes = 1048576
fs.inotify.max_user_watches = 6553600
fs.aio-max-nr = 3145728

cat /etc/security/limits.conf

• soft nofile 204800
• hard nofile 204800
• soft nproc 204800
• hard nproc 204800
• soft stack 8192
• hard core 0

echo 'noop' > /sys/block/sda/queue/scheduler