Piccoli appunti per grandi appassionati di sistemi open source …

In /etc/sysctl:

# increase TCP max buffer size setable using setsockopt()
net.core.rmem_max  = 40500000
net.core.wmem_max = 40500000
# 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 40500000
net.ipv4.tcp_wmem = 4096 65536 40500000
# 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
# net.core.netdev_max_backlog = 30000

Link utili:
http://www.psc.edu/networking/projects/tcptune/