Linux 系統下你關注過哪些內核參數，說說你知道的？

Tcp/ip io cpu memory
net.ipv4.tcp_syncookies = 1
#啟用syncookies
net.ipv4.tcp_max_syn_backlog = 8192
#SYN隊列長度
net.ipv4.tcp_synack_retries=2
#SYN ACK重試次數
net.ipv4.tcp_fin_timeout = 30
#主動關閉方FIN-WAIT-2超時時間
net.ipv4.tcp_keepalive_time = 1200
#TCP發送keepalive消息的頻度
net.ipv4.tcp_tw_reuse = 1
#開啟TIME-WAIT重用
net.ipv4.tcp_tw_recycle = 1
#開啟TIME-WAIT快速回收
net.ipv4.ip_local_port_range = 1024 65000
#向外連接的端口范圍
net.ipv4.tcp_max_tw_buckets = 5000
#最大TIME-WAIT數量，超過立即清除
net.ipv4.tcp_syn_retries = 2
#SYN重試次數
echo “fs.file-max=65535” >> /etc/sysctl.conf
sysctl -p