kernel tuning for high rate connections

sysctl.conf

kernel.printk = 4 4 1 7
kernel.panic = 10
kernel.sysrq = 16
kernel.shmmax = 4294967296
kernel.shmall = 4194304
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
vm.swappiness = 20
vm.dirty_ratio = 80
vm.dirty_background_ratio = 5
fs.file-max = 10000000
fs.nr_open = 10000000

net.core.netdev_max_backlog = 1000
#net.core.netdev_max_backlog = 30000

net.core.rmem_default = 212992
net.core.rmem_max = 33554432
net.core.wmem_default = 212992
net.core.wmem_max = 33554432
net.core.somaxconn = 65535
net.core.optmem_max = 20480
net.ipv4.neigh.default.gc_thresh1 = 128
net.ipv4.neigh.default.gc_thresh2 = 512
net.ipv4.neigh.default.gc_thresh3 = 1024
net.ipv4.neigh.default.gc_interval = 30
net.ipv4.neigh.default.gc_stale_time = 60
net.netfilter.nf_conntrack_max = 10000000
net.netfilter.nf_conntrack_tcp_loose = 0
net.netfilter.nf_conntrack_tcp_timeout_established = 40
net.netfilter.nf_conntrack_tcp_timeout_close = 10
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 10
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 10
net.netfilter.nf_conntrack_tcp_timeout_last_ack = 10
net.netfilter.nf_conntrack_tcp_timeout_syn_recv = 10
net.netfilter.nf_conntrack_tcp_timeout_syn_sent = 10
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 10
net.ipv4.tcp_slow_start_after_idle = 0

net.ipv4.ip_local_port_range = 1026 65535


net.ipv4.ip_no_pmtu_disc = 0
net.ipv4.route.flush = 1
net.ipv4.route.max_size = 2147483647
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.tcp_congestion_control = cubic
net.ipv4.tcp_mem = 65536 131072 262144
net.ipv4.udp_mem = 65536 131072 262144
net.ipv4.tcp_rmem = 4096 87380 33554432
net.ipv4.udp_rmem_min = 16384
net.ipv4.tcp_wmem = 4096 87380 33554432
net.ipv4.udp_wmem_min = 16384

net.ipv4.tcp_max_tw_buckets = 181072
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 400000
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rfc1337 = 0
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 1

net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_sack = 1
net.ipv4.tcp_fack = 1
net.ipv4.tcp_ecn = 2
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_intvl = 60
net.ipv4.tcp_keepalive_probes = 10
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.ip_forward = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.send_redirects = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.rp_filter = 1