net.core.rmem_max = 536870912 
net.core.wmem_max = 536870912 
# increase Linux autotuning TCP buffer limit
net.ipv4.tcp_rmem = 4096 87380 268435456
net.ipv4.tcp_wmem = 4096 65536 268435456
net.core.netdev_max_backlog = 250000
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_mtu_probing = 1
net.core.default_qdisc = fq