sysctl_improvements.conf

# Increase system IP port limits to allow for more connections
net.ipv4.ip_local_port_range = 2000 65000
net.ipv4.tcp_window_scaling = 1

# number of packets to keep in backlog before the kernel starts dropping them
net.ipv4.tcp_max_syn_backlog = 3240000

# increase socket listen backlog
net.core.somaxconn = 65536
net.ipv4.tcp_max_tw_buckets = 1440000

# Increase TCP buffer sizes
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_congestion_control = cubic