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Linux Kernel Parameter Tuning
Linux Kernel
Operating System 

OS
Kernel
CPU Mem GPU NIC
Keybo
ard
Kernel Parameter
Kernel OS 

Kernel
Linux 



Kernel Parameter






Linux Kernel 

Kernel Parameter Tuning
Kernel Parameter Tuning


/
IPv6


CentOS7
Windows
VM /


Kernel Parameter
/proc
echo 100 > /proc/sys/net/ipv4/tcp_keepalive_time
sysctl
 /etc/sysctl.conf
sysctl sysctl
RHEL systemctl disable tuned.service
sysctl
3
-a
sysctl -a
-w
sysctl -w net.ipv4.tcp_keepalive_time=100
-p
sysctl.conf
sysctl -p
CPU Memory Storage, Network
Linux Kernel
IT


CPU IO ( )


/
Linux 

DNS 

NW 



/ 



CentOS debian
- -
net.core.rmem_max = 16777216 TCP UDP
net.core.wmem_max = 16777216 TCP UDP
net.nf_conntrack_max = 1053616 ESTABLISHED (OS )
net.ipv4.tcp_rmem = 4096 349520 16777216
net.ipv4.tcp_timestamps = 0
NAT WAN
net.ipv4.tcp_fin_timeout = 5 FIN
net.ipv4.tcp_syn_retries = 3
tcp SYN 

SYN
- -
net.ipv4.tcp_synack_retries = 3
SYN
ACK SYN
net.ipv4.ip_local_port_range = 10000 65535
TCP/IP 

iptables 

$ cat /proc/sys/net/ipv4/ip_local_port_range
net.ipv4.tcp_tw_reuse = 1
tcp_tw_recycle
net.ipv4.tcp_tw_recycle = 0 *
net.ipv4.tcp_rfc1337 = 1
RFC1337 TIME_WAIT RST
TIME_WAIT
- -
net.ipv4.tcp_fin_timeout = 5
net.ipv4.tcp_max_tw_buckets = 65536
time-wait 

DoS
net.ipv4.tcp_orphan_retries = 0
TCP


web
net.ipv4.tcp_window_scaling = 1
RFC1323 TCP 

64KB TCP WIndow
net.ipv4.tcp_slow_start_after_idle = 0
keepalive congestion
window size reset 

keepalive off
- -
net.ipv4.tcp_keepalive_time = 10
CLOSE_WAIT
TCP
net.ipv4.tcp_keepalive_intvl = 3
TCP/IP
net.ipv4.tcp_keepalive_probes = 5
TCP keepalive
- -
net.core.netdev_max_backlog = 10240
net.ipv4.tcp_max_syn_backlog = 10240
SYN ACK


OS SYN


netstat 

net.core.somaxconn
net.core.somaxconn
net.core.somaxconn = 65535
TCP 

TCP backlog
- -
net.ipv4.tcp_window_scaling = 1
RFC1323 TCP 

64KB TCP WIndow
net.ipv4.tcp_max_syn_backlog = 10240
SYN ACK


OS SYN


netstat 

net.core.somaxconn
net.core.somaxconn
net.core.somaxconn = 65535
TCP 

TCP backlog
- -
net.ipv4.conf.all.rp_filter = 1 IP
net.ipv4.tcp_syncookies = 1 SYN flood
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.accept_source_route = 0
off
net.ipv4.conf.all.rp_filter = 1
RFC 3704 IF IF
IP DDoS
net.ipv4.conf.all.forwarding = 0

net.ipv4.conf.all.accept_redirects = 0

net.ipv4.conf.all.send_redirects = 0

net.ipv4.conf.all.secure_redirects = 0

net.ipv4.conf.all.mc_forwarding = 0
ICMP
- -
kernel.exec-shield = 1

kernel.randomize_va_space = 1
Exec-Shield ASLR
- -
vm.swappiness = 0
fs.file-max = 5242880


kernel.threads-max = 1060863
kernel.shmmax = kB
kernel.shmall = 68719476736
kernel.msgmnb = 65536 1
kernel.msgmax = 65536 ID
- -
vm.overcommit_memory = 2
vm.overcommit_ratio = 99




vm.overcommit_memory = 2
/proc/[process_id]/oom_adj = -17
vm.panic_on_oom=1
OOM Killer Kernel Panic 

vm.overcommit_memory = 1
kernel.panic=60
Kernel Panic 

vm.overcommit_memory = 1
- -
vm.dirty_ratio = 20 | 80
vm.dirty_background_ratio = 5 | 50
:
:
IO 

Kernel Parameter Kernel Version 



Red Hat Linux
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-
single/Performance_Tuning_Guide/index.html
sysctl man Linux Kernel doc
https://www.kernel.org/doc/Documentation/
Linux Kernel Parameter Tuning

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