fuji246

#!/usr/bin/osascript 

# helper function for command parameters
on stringSplit(str, delimiters)
        # save delimiters to restore old settings
        set oldDelimiters to AppleScript's text item delimiters
        # set delimiters to delimiter to be used
        set AppleScript's text item delimiters to delimiters
        # create the array
        set splitedArray to every text item of str

fuji246

#!/bin/bash

> mtr.log

for (( ; ; ))
do
mtr $1 -u -r >> mtr.log
done

fuji246

#! /usr/bin/env python
# coding=utf8

# modified from https://github.com/SwordYork/NetworkTool/blob/master/WPA-PSK/TKIP/psk.py

# alternatively, you can refer https://github.com/lomorage/pi-gen/blob/lomorage/stage2/02-net-tweaks/files/wifi_switch.sh#L12
# and use wpa_passphrase, and then replace ssid with hex binary of the SSID

import hmac
import hashlib

fuji246

Wireshark tcptrace colors

ack numbers from reverse packets

highest number (most recent) SACK block

subsequent SACK blocks

fuji246

1. uncomment the “deb-src” lines in /etc/apt/sources.list.

2. install packages and source

sudo apt update
sudo apt-get build-dep linux linux-image-$(uname -r)
sudo apt-get install libncurses-dev flex bison openssl libssl-dev dkms libelf-dev libudev-dev libpci-dev libiberty-dev autoconf
sudo apt-get install git
sudo apt-get source linux-image-$(uname -r)

fuji246

on OSX:

1. backup whole disk

# check micro sd card disk

$ diskutil list

# copy whole disk, /dev/disk2 is the sd card devcie, the size is 16G

fuji246

fuji246

• Paper
• Linux implementation
• Hystart
• Tuning parameters

Paper

use a cubic function to replace the linear window growth to improve performance in high BDP network, also achieved RTT fairness.

tcp-cubic is succssor of tcp-bic, tcp-bic use binary search to find the avialble bandwidth when congestion happens, and MAY enter an lieaner increasing state (Additive Increase)if it dropped too low, if it passed the maximum window, it goes into max probing state and will do the reverse and grow slowly initially and switch to additive increase if it can't find new maximum window nearby.

fuji246

$  uname -a
  Linux pi3 3.6.11+ #538 PREEMPT Fri Aug 30 20:42:08 BST 2013 armv6l GNU/Linux

  $ zgrep "* firmware as of" /usr/share/doc/raspberrypi-bootloader/changelog.Debian.gz | head -1 |
awk '{ print $5 }'
   d4f5315cfac4e

On the build host fetch the equivalent R-PI firmware.

  $ mkdir -p /embedded/raspbian/build/

fuji246

'''
server,    direction,   bitrate,  case,     buftune,  frto_response, tcp_abc
 HZ,        uplink,      15,       150 ms,   0,          0,             0
 HZ,        uplink,      22.1,     150 ms,   0,          0,             0            
 HZ,        uplink,      20.6,     150 ms,   0,          0,             0                
 HZ,        uplink,      11.5,     150 ms,   0,          0,             0             
 HZ,        uplink,      9.83,     150 ms,   0,          0,             0             
 HZ,        uplink,      7.8,      150 ms,   0,          0,             0             
 HZ,        uplink,      14.4,     150 ms,   0,          0,             0             
 HZ,        uplink,      12.7,     150 ms,   0,          0,             0