sysctl-2020.conf

kernel.msgmnb = 65536
kernel.msgmax = 65536
# use default
#kernel.shmmax = 68719476736
#kernel.shmall = 16777216
fs.file-max = 2097152
vm.swappiness = 10
vm.dirty_ratio = 60
vm.dirty_background_ratio = 2
net.ipv4.tcp_synack_retries = 2
# 1024 < 2000, let local use it
net.ipv4.ip_local_port_range = 2000 65535
net.ipv4.tcp_rfc1337 = 1
net.ipv4.conf.all.rp_filter = 2
net.ipv4.tcp_sack = 0
net.ipv4.tcp_max_syn_backlog = 4096
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 15
net.core.rmem_default = 31457280
net.core.rmem_max = 12582912
net.core.wmem_default = 31457280
net.core.wmem_max = 12582912
net.core.somaxconn = 65536
net.core.netdev_max_backlog = 65536
net.core.optmem_max = 25165824
net.ipv4.tcp_mem = 65536 131072 262144
net.ipv4.udp_mem = 65536 131072 262144
net.ipv4.tcp_rmem = 10240 87380 12582912
net.ipv4.udp_rmem_min = 16384
net.ipv4.tcp_wmem = 10240 87380 12582912
net.ipv4.udp_wmem_min = 16384
net.ipv4.tcp_max_tw_buckets = 1440000
# remove from kern 4.12
#net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1

general kernel tuning for any linux distro