Linux one million connections TCP

# General gigabit tuning:

net.core.rmem_max = 16777216

net.core.wmem_max = 16777216

net.ipv4.tcp_rmem = 4096 87380 16777216

net.ipv4.tcp_wmem = 4096 65536 16777216

net.ipv4.tcp_syncookies = 1




# this gives the kernel more memory for tcp

# which you need with many (100k+) open socket connections

net.ipv4.tcp_mem = 50576   64768   98152

net.core.netdev_max_backlog = 2500




# if masquerading used

net.ipv4.netfilter.ip_conntrack_max = 1048576







# one million connections




net.core.rmem_max = 33554432

net.core.wmem_max = 33554432

net.ipv4.tcp_rmem = 4096 16384 33554432

net.ipv4.tcp_wmem = 4096 16384 33554432

net.ipv4.tcp_mem = 786432 1048576 26777216

net.ipv4.tcp_max_tw_buckets = 360000

net.core.netdev_max_backlog = 2500

vm.min_free_kbytes = 65536

vm.swappiness = 0

net.ipv4.ip_local_port_range = 1024 65535