sysctl.conf: Revert enabling busy loop waiting on sockets
[people/pmueller/ipfire-2.x.git] / config / etc / sysctl.conf
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1net.ipv4.ip_forward = 1
2net.ipv4.ip_dynaddr = 1
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4net.ipv4.icmp_echo_ignore_broadcasts = 1
5net.ipv4.icmp_ignore_bogus_error_responses = 1
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6net.ipv4.icmp_ratelimit = 1000
7net.ipv4.icmp_ratemask = 6168
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9net.ipv4.tcp_syncookies = 1
10net.ipv4.tcp_fin_timeout = 30
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11net.ipv4.tcp_syn_retries = 3
12net.ipv4.tcp_synack_retries = 3
13
ed37f707 14net.ipv4.conf.default.arp_filter = 1
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15net.ipv4.conf.default.rp_filter = 0
16net.ipv4.conf.default.accept_redirects = 0
17net.ipv4.conf.default.accept_source_route = 0
18net.ipv4.conf.default.log_martians = 1
19
ed37f707 20net.ipv4.conf.all.arp_filter = 1
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21net.ipv4.conf.all.rp_filter = 0
22net.ipv4.conf.all.accept_redirects = 0
23net.ipv4.conf.all.accept_source_route = 0
24net.ipv4.conf.all.log_martians = 1
25
26kernel.printk = 1 4 1 7
dc931fba 27vm.mmap_min_addr = 4096
d1605d08 28vm.min_free_kbytes = 8192
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29
30# Disable IPv6 by default.
31net.ipv6.conf.all.disable_ipv6 = 1
32net.ipv6.conf.default.disable_ipv6 = 1
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33
34# Enable netfilter accounting
35net.netfilter.nf_conntrack_acct=1
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36
37# Disable netfilter on bridges.
38net.bridge.bridge-nf-call-ip6tables = 0
39net.bridge.bridge-nf-call-iptables = 0
40net.bridge.bridge-nf-call-arptables = 0
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41
42# Try to keep kernel address exposures out of various /proc files (kallsyms, modules, etc).
d5fe3322 43kernel.kptr_restrict = 2
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44
45# Avoid kernel memory address exposures via dmesg.
46kernel.dmesg_restrict = 1
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47
48# Minimal preemption granularity for CPU-bound tasks:
49# (default: 1 msec# (1 + ilog(ncpus)), units: nanoseconds)
50kernel.sched_min_granularity_ns = 10000000
51
52# If a workload mostly uses anonymous memory and it hits this limit, the entire
53# working set is buffered for I/O, and any more write buffering would require
54# swapping, so it's time to throttle writes until I/O can catch up. Workloads
55# that mostly use file mappings may be able to use even higher values.
56#
57# The generator of dirty data starts writeback at this percentage (system default
58# is 20%)
59vm.dirty_ratio = 10
60
61# Start background writeback (via writeback threads) at this percentage (system
62# default is 10%)
63vm.dirty_background_ratio = 3
64
65# The swappiness parameter controls the tendency of the kernel to move
66# processes out of physical memory and onto the swap disk.
67# 0 tells the kernel to avoid swapping processes out of physical memory
68# for as long as possible
69# 100 tells the kernel to aggressively swap processes out of physical memory
70# and move them to swap cache
71vm.swappiness = 1
72
73# The total time the scheduler will consider a migrated process
74# "cache hot" and thus less likely to be re-migrated
75# (system default is 500000, i.e. 0.5 ms)
76kernel.sched_migration_cost_ns = 5000000
77
78# Increase kernel buffer size maximums
79net.ipv4.tcp_rmem = 4096 87380 16777216
80net.ipv4.tcp_wmem = 4096 16384 16777216
81net.ipv4.udp_mem = 3145728 4194304 16777216
82
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83# Enable TCP fast-open
84net.ipv4.tcp_fastopen = 3