m3medium config

tuning

net.core.rmem_default = 268435456
net.core.wmem_default = 268435456
net.core.rmem_max = 268435456
net.core.wmem_max = 268435456
net.core.netdev_max_backlog = 100000
net.ipv4.tcp_rmem = 4096 16384 134217728
net.ipv4.tcp_wmem = 4096 16384 134217728
net.ipv4.tcp_mem = 786432 1048576 268435456
net.ipv4.tcp_max_tw_buckets = 360000
net.ipv4.tcp_max_syn_backlog = 10000
vm.min_free_kbytes = 65536
vm.swappiness = 0
net.core.somaxconn = 100000
net.netfilter.nf_conntrack_max = 1000000
fs.file-max = 65536

Erogo 100 MB/s con 80% della CPU
(100 MB/s sono 800 Mbit/s)