Linux network performance tuning

linux_tune.md

###Tuning

$ netstat -nao | grep 8080 | grep TIME_WAIT | wc -l

To achieve the top most performance you should tune the source server system limits:

net.ipv4.tcp_max_tw_buckets = 65536
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 0
net.ipv4.tcp_max_syn_backlog = 131072
net.ipv4.tcp_syn_retries = 3
net.ipv4.tcp_synack_retries = 3
net.ipv4.tcp_retries1 = 3
net.ipv4.tcp_retries2 = 8
net.ipv4.tcp_rmem = 16384 174760 349520
net.ipv4.tcp_wmem = 16384 131072 262144
net.ipv4.tcp_mem = 262144 524288 1048576
net.ipv4.tcp_max_orphans = 65536
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_low_latency = 1
net.ipv4.tcp_syncookies = 0

Solution on Linux is:

echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse
echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle

This allow the OS to quickly reuse those TIME_WAIT TCP sockets.

Solution on MacOSX is:

sysctl -w net.inet.tcp.msl=1000

Please note we never tested on Mac, but some people suggest this setting.