64 lines · bash
1#!/bin/bash2# SPDX-License-Identifier: GPL-2.03#4# Set standard production config values that relate to TCP behavior.5 6# Flush old cached data (fastopen cookies).7ip tcp_metrics flush all > /dev/null 2>&18 9# TCP min, default, and max receive and send buffer sizes.10sysctl -q net.ipv4.tcp_rmem="4096 540000 $((15*1024*1024))"11sysctl -q net.ipv4.tcp_wmem="4096 $((256*1024)) 4194304"12 13# TCP timestamps.14sysctl -q net.ipv4.tcp_timestamps=115 16# TCP SYN(ACK) retry thresholds17sysctl -q net.ipv4.tcp_syn_retries=518sysctl -q net.ipv4.tcp_synack_retries=519 20# TCP Forward RTO-Recovery, RFC 5682.21sysctl -q net.ipv4.tcp_frto=222 23# TCP Selective Acknowledgements (SACK)24sysctl -q net.ipv4.tcp_sack=125 26# TCP Duplicate Selective Acknowledgements (DSACK)27sysctl -q net.ipv4.tcp_dsack=128 29# TCP FACK (Forward Acknowldgement)30sysctl -q net.ipv4.tcp_fack=031 32# TCP reordering degree ("dupthresh" threshold for entering Fast Recovery).33sysctl -q net.ipv4.tcp_reordering=334 35# TCP congestion control.36sysctl -q net.ipv4.tcp_congestion_control=cubic37 38# TCP slow start after idle.39sysctl -q net.ipv4.tcp_slow_start_after_idle=040 41# TCP RACK and TLP.42sysctl -q net.ipv4.tcp_early_retrans=4 net.ipv4.tcp_recovery=143 44# TCP method for deciding when to defer sending to accumulate big TSO packets.45sysctl -q net.ipv4.tcp_tso_win_divisor=346 47# TCP Explicit Congestion Notification (ECN)48sysctl -q net.ipv4.tcp_ecn=049 50sysctl -q net.ipv4.tcp_pacing_ss_ratio=20051sysctl -q net.ipv4.tcp_pacing_ca_ratio=12052sysctl -q net.ipv4.tcp_notsent_lowat=4294967295 > /dev/null 2>&153 54sysctl -q net.ipv4.tcp_fastopen=0x7040355sysctl -q net.ipv4.tcp_fastopen_key=a1a1a1a1-b2b2b2b2-c3c3c3c3-d4d4d4d456 57sysctl -q net.ipv4.tcp_syncookies=158 59# Override the default qdisc on the tun device.60# Many tests fail with timing errors if the default61# is FQ and that paces their flows.62tc qdisc add dev tun0 root pfifo63 64