sysctl.conf优化

$ cat /etc/sysctl.conf
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename
# Useful for debugging multi-threaded applications
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies

# Controls the maximum size of a message, in bytes
kernel.msgmnb = 65536

# Controls the default maxmimum size of a mesage queue
kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296
vm.swappiness=10
#Randy
net.core.somaxconn = 204800
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_max_orphans = 262144
fs.file-max = 1280000
net.ipv4.tcp_max_tw_buckets = 180000
net.ipv4.tcp_syncookies = 1
net.unix.max_dgram_qlen = 10000
net.ipv4.conf.default.rp_filter = 0
net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.tcp_mem = 196608 262144 786432


另一个版本：
# Kernel sysctl configuration file for Red Hat Linux
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename
# Useful for debugging multi-threaded applications
kernel.core_uses_pid = 1

# Controls the use of TCP syncookies

# Controls the maximum size of a message, in bytes
kernel.msgmnb = 65536

# Controls the default maxmimum size of a mesage queue
kernel.msgmax = 65536

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 68719476736

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 4294967296
vm.swappiness=10

net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_keepalive_intvl = 10
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_timestamps = 0
net.ipv4.ip_local_port_range = 1024 65535
net.core.rmem_default = 16777216
net.core.wmem_default = 16777216
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_fin_timeout = 10
net.core.somaxconn = 262144
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_tw_buckets = 180000
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_max_syn_backlog = 262144
net.core.netdev_max_backlog = 300000
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
fs.file-max = 999999
net.ipv4.tcp_syncookies = 1
net.unix.max_dgram_qlen = 10000
net.ipv4.tcp_mem = 196608 262144 786432