#!/bin/bash # echo -e '\033[33m----Optimise tcp ip----\033[33m' echo -e "\033[0m" sleep 2 sudo mv /etc/sysctl.conf /etc/sysctl.conf.default sudo bash -c 'cat << EOF > /etc/sysctl.conf ############################# ## Battery life tweaks # ############################# #vm.dirty_writeback_centisecs=3000 #vm.dirty_expire_centisecs=500 # ############################# ## CPU tweaks # ############################# # ## Queue size modifications net.core.optmem_max=20480 net.unix.max_dgram_qlen=50 # ## Net Core Settings ## Location: /proc/sys/net/core net.core.wmem_max=524288 net.core.rmem_max=524288 net.core.rmem_default=256960 net.core.wmem_default=256960 # ############################# ## VM & Filesystem tweaks # ############################# fs.lease-break-time=10 fs.file-max=65536 vm.overcommit_memory=1 vm.oom_dump_tasks=1 vm.page-cluster=0 vm.swappiness = 26 vm.vfs_cache_pressure = 10000 vm.dirty_ratio = 10 vm.dirty_background_ratio = 5 # ############################# ## Net Speed tweaks # ############################# # net.core.default_qdisc = cake net.ipv4.tcp_congestion_control = bbr #net.ipv4.tcp_congestion_control=cubic net.ipv4.tcp_mtu_probing = 1 net.ipv4.tcp_fastopen = 3 net.ipv4.tcp_keepalive_time = 60 net.ipv4.tcp_keepalive_intvl = 10 net.ipv4.tcp_keepalive_probes = 6 # # # Hardening the TCP/IP stack to SYN attacks net.ipv4.tcp_syncookies=1 net.ipv4.conf.all.rp_filter=1 net.ipv4.conf.default.rp_filter=1 net.ipv4.tcp_synack_retries=2 net.ipv4.tcp_syn_retries=2 net.ipv4.tcp_max_syn_backlog=1024 net.ipv4.tcp_max_tw_buckets=16384 net.ipv4.icmp_echo_ignore_all=1 net.ipv4.icmp_ignore_bogus_error_responses=1 net.ipv4.tcp_no_metrics_save=1 net.ipv4.tcp_fin_timeout=15 net.ipv4.tcp_keepalive_time=1800 net.ipv4.ip_forward=0 net.ipv4.tcp_moderate_rcvbuf=1 net.ipv4.route.flush=1 net.ipv4.udp_rmem_min=6144 net.ipv4.udp_wmem_min=6144 net.ipv4.tcp_rfc1337=1 net.ipv4.ip_no_pmtu_disc=0 net.ipv4.tcp_ecn=0 net.ipv4.tcp_sack=1 net.ipv4.tcp_fack=1 # # Dont accept source routing net.ipv4.conf.default.accept_source_route=0 net.ipv4.conf.all.accept_source_route=0 # # Dont accept redirects net.ipv4.conf.all.accept_redirects=0 net.ipv4.conf.default.accept_redirects=0 net.ipv4.conf.all.secure_redirects=0 net.ipv4.conf.default.secure_redirects=0 EOF' sudo /sbin/sysctl -p #--------------------------------------------------------------------- # Network and memory-related optimizationss for 32GB #--------------------------------------------------------------------- kernel.sysrq = 1 # Enable SysRQ for rebooting the machine properly if it freezes. [Source](https://oglo.dev/tutorials/sysrq/index.html) net.core.netdev_max_backlog = 30000 # Help prevent packet loss during high traffic periods. net.core.rmem_default = 262144 # Default socket receive buffer size, improve network performance & applications that use sockets. Adjusted for 32GB RAM. net.core.rmem_max = 67108864 # Maximum socket receive buffer size, determine the amount of data that can be buffered in memory for network operations. Adjusted for 32GB RAM. net.core.wmem_default = 262144 # Default socket send buffer size, improve network performance & applications that use sockets. Adjusted for 32GB RAM. net.core.wmem_max = 67108864 # Maximum socket send buffer size, determine the amount of data that can be buffered in memory for network operations. Adjusted for 32GB RAM. net.core.default_qdisc = fq net.ipv4.tcp_congestion_control = bbr net.ipv4.tcp_fastopen = 3 net.ipv4.tcp_keepalive_intvl = 10 # TCP keepalive interval between probes to detect if a connection is still alive. net.ipv4.tcp_keepalive_probes = 5 # TCP keepalive probes to detect if a connection is still alive. net.ipv4.tcp_keepalive_time = 60 # TCP keepalive interval in seconds to detect if a connection is still alive. vm.dirty_background_bytes = 134217728 # 128 MB vm.dirty_bytes = 402653184 # 384 MB vm.min_free_kbytes = 65536 # Minimum free memory for safety (in KB), helping prevent memory exhaustion situations. Adjusted for 32GB RAM. vm.swappiness = 5 # Adjust how aggressively the kernel swaps data from RAM to disk. Lower values prioritize keeping data in RAM. Adjusted for 32GB RAM. vm.vfs_cache_pressure = 90 # Adjust vfs_cache_pressure (0-1000) to manage memory used for caching filesystem objects. Adjusted for 32GB RAM. #--------------------------------------------------------------------- # Nobara Tweaks #--------------------------------------------------------------------- fs.aio-max-nr = 1000000 # defines the maximum number of asynchronous I/O requests that can be in progress at a given time. 1048576 fs.inotify.max_user_watches = 65536 # sets the maximum number of file system watches, enhancing file system monitoring capabilities. Default: 8192 TWEAKED: 524288 kernel.panic = 5 # Reboot after 5 seconds on kernel panic Default: 0 kernel.pid_max = 131072 # allows a large number of processes and threads to be managed Default: 32768 TWEAKED: 4194304 #--------------------------------------------------------------------- # SSD tweaks: Adjust settings for an SSD to optimize performance. #--------------------------------------------------------------------- vm.dirty_background_ratio = 40 # Set the ratio of dirty memory at which background writeback starts (5%). Adjusted for SSD. vm.dirty_expire_centisecs = 3000 # Set the time at which dirty data is old enough to be eligible for writeout (6000 centiseconds). Adjusted for SSD. vm.dirty_ratio = 80 # Set the ratio of dirty memory at which a process is forced to write out dirty data (10%). Adjusted for SSD. vm.dirty_writeback_centisecs = 300 # Set the interval between two consecutive background writeback passes (500 centiseconds)