tools/testing/selftests/net/packetdrill/defaults.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Set standard production config values that relate to TCP behavior.
   5
   6 # Flush old cached data (fastopen cookies).
   7 ip tcp_metrics flush all > /dev/null 2>&1
   8
   9 # TCP min, default, and max receive and send buffer sizes.
  10 sysctl -q net.ipv4.tcp_rmem="4096 540000 $((15*1024*1024))"
  11 sysctl -q net.ipv4.tcp_wmem="4096 $((256*1024)) 4194304"
  12
  13 # TCP timestamps.
  14 sysctl -q net.ipv4.tcp_timestamps=1
  15
  16 # TCP SYN(ACK) retry thresholds
  17 sysctl -q net.ipv4.tcp_syn_retries=5
  18 sysctl -q net.ipv4.tcp_synack_retries=5
  19
  20 # TCP Forward RTO-Recovery, RFC 5682.
  21 sysctl -q net.ipv4.tcp_frto=2
  22
  23 # TCP Selective Acknowledgements (SACK)
  24 sysctl -q net.ipv4.tcp_sack=1
  25
  26 # TCP Duplicate Selective Acknowledgements (DSACK)
  27 sysctl -q net.ipv4.tcp_dsack=1
  28
  29 # TCP FACK (Forward Acknowldgement)
  30 sysctl -q net.ipv4.tcp_fack=0
  31
  32 # TCP reordering degree ("dupthresh" threshold for entering Fast Recovery).
  33 sysctl -q net.ipv4.tcp_reordering=3
  34
  35 # TCP congestion control.
  36 sysctl -q net.ipv4.tcp_congestion_control=cubic
  37
  38 # TCP slow start after idle.
  39 sysctl -q net.ipv4.tcp_slow_start_after_idle=0
  40
  41 # TCP RACK and TLP.
  42 sysctl -q net.ipv4.tcp_early_retrans=4 net.ipv4.tcp_recovery=1
  43
  44 # TCP method for deciding when to defer sending to accumulate big TSO packets.
  45 sysctl -q net.ipv4.tcp_tso_win_divisor=3
  46
  47 # TCP Explicit Congestion Notification (ECN)
  48 sysctl -q net.ipv4.tcp_ecn=0
  49
  50 sysctl -q net.ipv4.tcp_pacing_ss_ratio=200
  51 sysctl -q net.ipv4.tcp_pacing_ca_ratio=120
  52 sysctl -q net.ipv4.tcp_notsent_lowat=4294967295 > /dev/null 2>&1
  53
  54 sysctl -q net.ipv4.tcp_fastopen=0x70403
  55 sysctl -q net.ipv4.tcp_fastopen_key=a1a1a1a1-b2b2b2b2-c3c3c3c3-d4d4d4d4
  56
  57 sysctl -q net.ipv4.tcp_syncookies=1
  58
  59 # Override the default qdisc on the tun device.
  60 # Many tests fail with timing errors if the default
  61 # is FQ and that paces their flows.
  62 tc qdisc add dev tun0 root pfifo
  63