/etc/sysctl.confを編集し、下記を最終行に追記。
## increase TCP max buffer size setable using setsockopt() net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 ## increase Linux autotuning TCP buffer limits ## min, default, and max number of bytes to use ## set max to at least 4MB, or higher if you use very high BDP paths net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 ## don't cache ssthresh from previous connection net.ipv4.tcp_no_metrics_save = 1 net.ipv4.tcp_moderate_rcvbuf = 1 ## recommended to increase this for 1000 BT or higher net.core.netdev_max_backlog = 2500 ## for 10 GigE, use this, uncomment below ## net.core.netdev_max_backlog = 30000 ## Turn off timestamps if you're on a gigabit or very busy network ## Having it off is one less thing the IP stack needs to work on ## net.ipv4.tcp_timestamps = 0 ## disable tcp selective acknowledgements. net.ipv4.tcp_sack = 0 ##enable window scaling net.ipv4.tcp_window_scaling = 1
保存後、下記コマンドで適用
# sysctl -p