Adjust kernel network parameters

sysctl.conf

net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.core.rmem_default=65536
net.core.wmem_default=65536
net.ipv4.tcp_rmem=4096 87380 16777216
net.ipv4.tcp_wmem=4096 65536 16777216
net.ipv4.tcp_mem=16777216 16777216 16777216
net.ipv4.route.flush=1
net.core.netdev_max_backlog=30000
net.ipv4.udp_mem=16777216 16777216 16777216
net.ipv4.tcp_congestion_control=htcp
net.ipv4.udp_rmem_min=16777216