sysctl -w net.core.rmem_max=33554432
sysctl -w net.core.wmem_max=33554432
sysctl -w net.core.rmem_default=65536
sysctl -w net.core.wmem_default=65536
sysctl -w net.ipv4.tcp_rmem="4096 33554432 33554432"
sysctl -w net.ipv4.tcp_wmem="4096 33554432 33554432"
sysctl -w net.ipv4.tcp_mem="33554432 33554432 33554432"
sysctl -w net.ipv4.route.flush=1
sysctl -w net.core.netdev_max_backlog=1500
ifconfig eth0 txqueuelen 4000

sysctl -w net.ipv4.web100_default_wscale=7
sysctl -w net.ipv4.web100_no_metrics_save=1
sysctl -w net.ipv4.web100_sbufmode=0
sysctl -w net.ipv4.web100_rbufmode=0
sysctl -w net.ipv4.WAD_IFQ=1

# turn on NAPI option for Intel NIC
# add "options e1000 RxDescriptors=4096" into /etc/modules.conf