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92 lines
2.7 KiB
92 lines
2.7 KiB
5 years ago
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#!/bin/bash
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cat > sysctl.conf <EOF
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# maximum number of open files/file descriptors
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fs.file-max = 4194303
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# use as little swap space as possible
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vm.swappiness = 1
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# prioritize application RAM against disk/swap cache
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vm.vfs_cache_pressure = 10
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# minimum free memory
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vm.min_free_kbytes = 1000000
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# maximum receive socket buffer (bytes)
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net.core.rmem_max = 268435456
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# maximum send buffer socket buffer (bytes)
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net.core.wmem_max = 268435456
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# default receive buffer socket size (bytes)
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net.core.rmem_default = 67108864
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# default send buffer socket size (bytes)
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net.core.wmem_default = 67108864
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# maximum number of packets in one poll cycle
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net.core.netdev_budget = 1200
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# maximum ancillary buffer size per socket
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net.core.optmem_max = 134217728
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# maximum number of incoming connections
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net.core.somaxconn = 65535
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# maximum number of packets queued
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net.core.netdev_max_backlog = 250000
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# maximum read buffer space
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net.ipv4.tcp_rmem = 67108864 134217728 268435456
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# maximum write buffer space
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net.ipv4.tcp_wmem = 67108864 134217728 268435456
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# enable low latency mode
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net.ipv4.tcp_low_latency = 1
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# socket buffer portion used for TCP window
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net.ipv4.tcp_adv_win_scale = 1
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# queue length of completely established sockets waiting for accept
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net.ipv4.tcp_max_syn_backlog = 30000
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# maximum number of sockets in TIME_WAIT state
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net.ipv4.tcp_max_tw_buckets = 2000000
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# reuse sockets in TIME_WAIT state when safe
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net.ipv4.tcp_tw_reuse = 1
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# time to wait (seconds) for FIN packet
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net.ipv4.tcp_fin_timeout = 5
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# disable icmp send redirects
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net.ipv4.conf.all.send_redirects = 0
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# disable icmp accept redirect
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net.ipv4.conf.all.accept_redirects = 0
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# drop packets with LSR or SSR
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net.ipv4.conf.all.accept_source_route = 0
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# MTU discovery, only enable when ICMP blackhole detected
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net.ipv4.tcp_mtu_probing = 1
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EOF
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echo "Enabling system level tuning params"
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sysctl --quiet --load sysctl.conf && rm -f sysctl.conf
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# `Transparent Hugepage Support`*: This is a Linux kernel feature intended to improve
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# performance by making more efficient use of processor’s memory-mapping hardware.
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# But this may cause https://blogs.oracle.com/linux/performance-issues-with-transparent-huge-pages-thp
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# for non-optimized applications. As most Linux distributions set it to `enabled=always` by default,
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# we recommend changing this to `enabled=madvise`. This will allow applications optimized
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# for transparent hugepages to obtain the performance benefits, while preventing the
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# associated problems otherwise. Also, set `transparent_hugepage=madvise` on your kernel
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# command line (e.g. in /etc/default/grub) to persistently set this value.
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echo "Enabling THP madvise"
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echo madvise | sudo tee /sys/kernel/mm/transparent_hugepage/enabled
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