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98 lines
3.6 KiB
98 lines
3.6 KiB
# Kernel Tuning for MinIO Production Deployment on Linux Servers [](https://slack.min.io) [](https://hub.docker.com/r/minio/minio/)
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Following are the recommended settings, a copy of this [script](https://github.com/minio/minio/blob/master/docs/deployment/kernel-tuning/sysctl.sh) is available here to be applied on Linux servers.
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> NOTE: Although these settings are generally good on Linux servers, users must be careful on any premature tuning. These tunings are generally considered good to have but not mandatory, these settings do not fix any hardware issues and should not be considered as an alternative to boost performance. Under most circumstances this tuning is to be done after performing baseline performance tests for the hardware with expected results.
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```
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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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```
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