Linux Kernel parameter optimization

Linux kernel parameter optimization 1. Move the VM, swappinessSet to 0-10
2. Place the VM, dirty_background_ratioSet to 5-10, move the VM, dirty_ratioSet it to the 两倍To ensure that dirty data can be continuously flushed to 磁盘, avoid instant I/OWrite, producing serious 等待
3. Optimizing the TCP protocol stack

#减少TIME_WAIT, improve TCP efficiency net.ipv4.tcp_tw_recyle=1net.ipv4.tcp_tw_reuse=1# reduce the time in the Fin-wait-2 connection state, The system can handle more connections net.ipv4.tcp_fin_timeout=2# reduce the time of TCP keepalived connection detection, so that the system can handle more connections. net.ipv4.tcp_keepalived_time=600# increase the maximum number of SYN half connections supported by the system (default 1024x768) Net.ipv4.tcp_max_syn_backlog = 16384# Reduce the number of System SYN connection retries (default 5) Net,ipv4.tcp_synack_retries = 1net.ipv4.tcp_sync_retries = # # Sends the number of SYN packets before the kernel discards the established connection Net.ipv4.ip_local_prot_range = 4500 65535# allow the system to open the port range

4. Network optimization

#优化系统套接字缓冲区

#Increase TCP Max buffer sizenet.core.rmem_max=16777216       #最大socket读buffernet. core.wmem_max=16777216       # Maximum socket Write Buffernet.core.wmem_default = 8388608  #该文件指定了接收套接字缓冲区大小的缺省值 (in bytes) Net.core.rmem_default = 8388608

#优化TCP接收/Send Buffers

# increase Linux autotuning TCP buffer limitsnet.ipv4.tcp_rmem=4096 87380 16777216net.ipv4.tcp_wmem=4096 65536 16777216net.ipv4.tcp_mem = 94500000 915000000 927000000

#优化网络设备接收队列

net.core.netdev_max_backlog=3000

5. Other Optimizations

Net.ipv4.tcp_timestamps = 0net.ipv4.tcp_max_orphans = 3276800net.ipv4.tcp_max_tw_buckets = 360000

Linux Kernel parameter optimization