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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 = 50
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# minimum free memory
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vm.min_free_kbytes = 1000000
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# follow mellanox best practices https://community.mellanox.com/s/article/linux-sysctl-tuning
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# the following changes are recommended for improving IPv4 traffic performance by Mellanox
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# disable the TCP timestamps option for better CPU utilization
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net.ipv4.tcp_timestamps = 0
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# enable the TCP selective acks option for better throughput
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net.ipv4.tcp_sack = 1
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# increase the maximum length of processor input queues
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net.core.netdev_max_backlog = 250000
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# increase the TCP maximum and default buffer sizes using setsockopt()
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net.core.rmem_max = 4194304
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net.core.wmem_max = 4194304
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net.core.rmem_default = 4194304
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net.core.wmem_default = 4194304
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net.core.optmem_max = 4194304
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# increase memory thresholds to prevent packet dropping:
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net.ipv4.tcp_rmem = 4096 87380 4194304
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net.ipv4.tcp_wmem = 4096 65536 4194304
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# enable low latency mode for TCP:
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net.ipv4.tcp_low_latency = 1
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# the following variable is used to tell the kernel how much of the socket buffer
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# space should be used for TCP window size, and how much to save for an application
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# buffer. A value of 1 means the socket buffer will be divided evenly between.
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# TCP windows size and application.
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net.ipv4.tcp_adv_win_scale = 1
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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 = 10000
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# queue length of completely established sockets waiting for accept
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net.ipv4.tcp_max_syn_backlog = 4096
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# time to wait (seconds) for FIN packet
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net.ipv4.tcp_fin_timeout = 15
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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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