sysctl参数

Linux 内核参数优化

# sysctl -a

kernel.sched_child_runs_first = 0 kernel.sched_rt_period_us = 1000000 kernel.sched_rt_runtime_us = 950000 kernel.sched_compat_yield = 0 kernel.panic = 0

kernel.core_uses_pid = 0 kernel.core_pattern = core kernel.core_pipe_limit = 0 kernel.tainted = 1

kernel.real-root-dev = 0 kernel.print-fatal-signals = 0 kernel.ctrl-alt-del = 0

kernel.modprobe = /sbin/modprobe kernel.modules_disabled = 0 kernel.hotplug =

kernel.acct = 4 2 30 kernel.cad_pid = 1

kernel.threads-max = 2078 kernel.random.poolsize = 4096 kernel.random.entropy_avail = 0

kernel.random.read_wakeup_threshold = 64 kernel.random.write_wakeup_threshold = 128

kernel.random.boot_id = bf86a76f-dded-440c-a075-527a89cfcefa kernel.random.uuid = 5479d5cc-0ca6-4b86-a40c-7a6a4194772b kernel.overflowuid = 65534 kernel.overflowgid = 65534 kernel.pid_max = 32768 kernel.panic_on_oops = 0

kernel.printk = 7 4 1 7 kernel.printk_ratelimit = 5

kernel.printk_ratelimit_burst = 10 kernel.printk_delay = 0 kernel.dmesg_restrict = 0 kernel.kptr_restrict = 1

kernel.ngroups_max = 65536 kernel.randomize_va_space = 2 kernel.max_lock_depth = 1024

kernel.poweroff_cmd = /sbin/poweroff kernel.keys.maxkeys = 200 kernel.keys.maxbytes = 20000

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kernel.keys.root_maxkeys = 200 kernel.keys.root_maxbytes = 20000 kernel.keys.gc_delay = 300 kernel.blk_iopoll = 1 kernel.ostype = Linux

kernel.osrelease = 2.6.38.8

kernel.version = #747 PREEMPT Sat Jan 31 10:12:09 CST 2015 kernel.hostname = Ambarella kernel.domainname = (none) kernel.shmmax = 33554432 kernel.shmall = 2097152 kernel.shmmni = 4096 kernel.msgmax = 8192 kernel.msgmni = 259 kernel.msgmnb = 16384

kernel.sem = 250 32000 32 128 kernel.auto_msgmni = 1 kernel.pty.max = 4096 kernel.pty.nr = 0

vm.overcommit_memory = 0 vm.panic_on_oom = 0

vm.oom_kill_allocating_task = 0 vm.oom_dump_tasks = 1 vm.overcommit_ratio = 50 vm.page-cluster = 3

vm.dirty_background_ratio = 10 vm.dirty_background_bytes = 0 vm.dirty_ratio = 20 vm.dirty_bytes = 0

vm.dirty_writeback_centisecs = 500 vm.dirty_expire_centisecs = 3000 vm.nr_pdflush_threads = 0 vm.swappiness = 60

vm.lowmem_reserve_ratio = 32 vm.drop_caches = 0

sysctl: error reading key 'vm.compact_memory': Permission denied vm.extfrag_threshold = 500 vm.min_free_kbytes = 10240 vm.min_free_order_shift = 1 vm.percpu_pagelist_fraction = 0 vm.max_map_count = 65530 vm.laptop_mode = 1 vm.block_dump = 0

vm.vfs_cache_pressure = 160

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vm.mmap_min_addr = 4096 vm.scan_unevictable_pages = 0 fs.inode-nr = 1615 18

fs.inode-state = 1615 18 0 0 0 0 0 fs.file-nr = 80 0 13289 fs.file-max = 13289 fs.nr_open = 1048576

fs.dentry-state = 1755 1408 45 0 0 0 fs.overflowuid = 65534 fs.overflowgid = 65534 fs.leases-enable = 1 fs.dir-notify-enable = 1 fs.lease-break-time = 45 fs.aio-nr = 0

fs.aio-max-nr = 65536

fs.inotify.max_user_instances = 128 fs.inotify.max_user_watches = 8192 fs.inotify.max_queued_events = 16384 fs.epoll.max_user_watches = 50441 fs.suid_dumpable = 0

fs.pipe-max-size = 1048576 fs.nfs.nfs_callback_tcpport = 0 fs.nfs.idmap_cache_timeout = 600 fs.nfs.nfs_mountpoint_timeout = 500 fs.nfs.nfs_congestion_kb = 11648 fs.nfs.nlm_grace_period = 0 fs.nfs.nlm_timeout = 10 fs.nfs.nlm_udpport = 0 fs.nfs.nlm_tcpport = 0

fs.nfs.nsm_use_hostnames = 0 fs.nfs.nsm_local_state = 0 fs.mqueue.queues_max = 256 fs.mqueue.msg_max = 10

fs.mqueue.msgsize_max = 8192 net.core.somaxconn = 128 net.core.wmem_max = 106496 net.core.rmem_max = 10485760 net.core.wmem_default = 106496 net.core.rmem_default = 1048576 net.core.dev_weight = 64

net.core.netdev_max_backlog = 1000 net.core.netdev_tstamp_prequeue = 1 net.core.message_cost = 5 net.core.message_burst = 10

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net.core.optmem_max = 10240 net.core.netdev_budget = 300 net.core.warnings = 1

net.ipv4.route.gc_thresh = 2048 net.ipv4.route.max_size = 32768 net.ipv4.route.gc_min_interval = 0

net.ipv4.route.gc_min_interval_ms = 500 net.ipv4.route.gc_timeout = 300 net.ipv4.route.gc_interval = 60 net.ipv4.route.redirect_load = 2 net.ipv4.route.redirect_number = 9 net.ipv4.route.redirect_silence = 2048 net.ipv4.route.error_cost = 100 net.ipv4.route.error_burst = 500 net.ipv4.route.gc_elasticity = 8 net.ipv4.route.mtu_expires = 600 net.ipv4.route.min_pmtu = 552 net.ipv4.route.min_adv_mss = 256

sysctl: error reading key 'net.ipv4.route.flush': Permission denied net.ipv4.neigh.default.mcast_solicit = 3 net.ipv4.neigh.default.ucast_solicit = 3 net.ipv4.neigh.default.app_solicit = 0 net.ipv4.neigh.default.retrans_time = 100

net.ipv4.neigh.default.base_reachable_time = 30 net.ipv4.neigh.default.delay_first_probe_time = 5 net.ipv4.neigh.default.gc_stale_time = 60 net.ipv4.neigh.default.unres_qlen = 3 net.ipv4.neigh.default.proxy_qlen = 64 net.ipv4.neigh.default.anycast_delay = 100 net.ipv4.neigh.default.proxy_delay = 80 net.ipv4.neigh.default.locktime = 100

net.ipv4.neigh.default.retrans_time_ms = 1000

net.ipv4.neigh.default.base_reachable_time_ms = 30000 net.ipv4.neigh.default.gc_interval = 30 net.ipv4.neigh.default.gc_thresh1 = 128 net.ipv4.neigh.default.gc_thresh2 = 512 net.ipv4.neigh.default.gc_thresh3 = 1024 net.ipv4.neigh.lo.mcast_solicit = 3 net.ipv4.neigh.lo.ucast_solicit = 3 net.ipv4.neigh.lo.app_solicit = 0 net.ipv4.neigh.lo.retrans_time = 100

net.ipv4.neigh.lo.base_reachable_time = 30 net.ipv4.neigh.lo.delay_first_probe_time = 5 net.ipv4.neigh.lo.gc_stale_time = 60

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