Modifying Network Parameters

tcp_max_syn_backlog

Maximum number of clients that can receive SYN (synchronization) packets.

2048

8192.

echo 8192 > /proc/sys/net/ipv4/tcp_max_syn_backlog
echo 1024 > /proc/sys/net/core/somaxconn
echo 16777216 > /proc/sys/net/core/rmem_max
echo 16777216 > /proc/sys/net/core/wmem_max
echo 4096 87380 16777216> /proc/sys/net/ipv4/tcp_rmem
echo 4096 65536 16777216> /proc/sys/net/ipv4/tcp_wmem
echo 360000 > /proc/sys/net/ipv4/tcp_max_tw_buckets

net.core.somaxconn

Maximum number of clients that can process data in the server, that is, the maximum number of connections.

128

1024.

net.core.rmem_max

Maximum size of the socket receive buffer, in bytes.

229376

16777216.

net.core.wmem_max

Maximum size of the socket send buffer, in bytes.

229376

16777216.

net.ipv4.tcp_rmem

Size of the read buffer. The three numbers indicate the minimum, default, and maximum size of the read buffer.

4096 87380 6291456

4096 87380 16777216.

net.ipv4.tcp_wmem

Size of the write buffer. The three numbers indicate the minimum, default, and maximum size of the write buffer.

4096 16384 4194304

4096 65536 16777216.

net.ipv4.max_tw_buckets

Maximum number of TIME_WAIT sockets that can be retained by the system at the same time.

2048

360000.