Type |
Parameter |
Description |
Recommended value/range |
|---|---|---|---|
| Network parameter | net.core.somaxconn | The maximum length of the socket listening queue. Set this parameter to a large value if you frequently establish connections. | 2048. The default value is 128. |
| Network parameter | net.core.netdev_max_backlog | The length of the buffer queue processed by the protocol stack. If the value is too small, packet loss may occur. | 10000 |
| Network parameter | net.core.rmem_default | The default size of the receiving buffer queue. | 16777216 |
| Network parameter | net.core.wmem_default | The default size of the sending buffer queue. | 16777216 |
| Network parameter | net.core.rmem_max | The maximum size of the receiving buffer queue. | 16777216 |
| Network parameter | net.core.wmem_max | The maximum size of the sending buffer queue. | 16777216 |
| Network parameter | net.ipv4.ip_local_port_range | The port range of the local TCP/UDP client. The local client uses the ports within this range to initiate a connection with a remote client. | [3500, 65535] |
| Network parameter | net.ipv4.tcp_rmem | The minimum, default, and maximum sizes of the socket receiving buffer. | 4096 (minimum size), 87380 (default size), and 16777216 (maximum size). |
| Network parameter | net.ipv4.tcp_wmem | The minimum, default, and maximum sizes of the socket sending buffer. | 4096 (minimum size), 65536 (default size), and 16777216 (maximum size). |
| Network parameter | net.ipv4.tcp_max_syn_backlog | The number of connections in the SYN_RECVD state. | 16384 |
| Network parameter | net.ipv4.tcp_fin_timeout | The duration of the FIN-WAIT-2 state after the socket actively disconnects. | 15 |
| Network parameter | net.ipv4.tcp_tw_reuse | The number of sockets in TIME WAIT state allowed to be reused. | 1 |
| Network parameter | net.ipv4.tcp_slow_start_after_idle | Slow starts of TCP connections from the Idle state can be disabled to reduce network latency in some cases. | 0 |
| Virtual memory configuration | vm.swappiness | The preferential use of the physical memory. | 0 |
| Virtual memory configuration | vm.max_map_count | The number of virtual memory areas that a process can have. | 655360 |
| AIO configuration | fs.aio-max-nr | The number of asynchronous I/O requests. | 1048576 |
OS parameter tuning
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