Network

Wireless, 3G and 2G Network Speed

ByEric Ma Jul 13, 2013Aug 30, 2020

I get wireless, 3G and 2G network connection via my iPhone. I tested the network speed of a wireless, 3G and 2G network possible from my iPhone using the App from OFCA.

Wifi of sMobileNet network in HKUST: 25604 kbps:

3G network from a carrier in Hong Kong: 2776 kbps:

2G network from a carrier in Hong Kong: 169 kbps:

If we consider the speed of 2G network as 1X. Then the relative speed for Wifi, 3G and 2G networks are:

Network	Relativespeed
2G	1.0X
3G	16.4X
Wifi	151.5X

QA

Set Chrome RSS Subscription Extension to Subscribe to RSS feed using Feedly
ByQ A Mar 24, 2018

How to set Chrome RSS Subscription Extension so that I can subscribe to RSS feed using Feedly? Both tools are great and it will be better to combine them together. The link in feedly to subscribe a RSS feed (e.g. https://www.systutorials.com/b/feed/ ) is: http://www.feedly.com/home#subscription/feed/https://www.systutorials.com/b/feed/ We can replace the RSS feed URL with a %s in…

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QA

Linux timer sources
ByQ A Mar 24, 2018

Linux supports different timer sources and a machine can have multiple ones. How to find the available Linux timer source and the current one used? Find the current timer source: $ cat /sys/devices/system/clocksource/clocksource0/current_clocksource Find all available timer sources: $ cat /sys/devices/system/clocksource/clocksource0/available_clocksource Read more: Force Linux to reboot Wireless driver in Linux Mint for HP Mini…

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QA

How to make a unique temporary file in Bash on Linux?
ByEric Ma Mar 24, 2018Mar 24, 2018

It is common to make a unique temporary file. How to make a unique temporary file in Bash on Linux safely and quickly? You can use the mktemp program. In the simplest way, tmpfile=$(mktemp) The file will be like /tmp/tmp.j0wD39Mr3b if you do not prefer any meaningful names. You can set the file to your…

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QA

How to remap the Caps Lock key to Control for Emacs
ByEric Ma Mar 24, 2018Oct 7, 2019

How to remap the Caps Lock key to Control for Emacs? My left little finger is just so tired… You can either change it in gnome-tweak-tool on Gnome 3: Or: You can make use of 2 tools: xev to find out the key code for Caps Lock and xmodmap to modify key maps. First, run…

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QA

How to delete multiple items from Kindle Library
ByQ A Mar 24, 2018

The Kindle Library Web interface only provide interface to delete items one by one. How to delete multiple items from my Kindle Library? This works on Chrome. First, browse deki.js to find the javascript for the “DeKi: Delete Kindle Items” plugin. Press “Ctrl + A” then “Ctrl + C” to copy all the javascript code….

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QA

how to install older version gcc/g++ in Ubuntu (other linux distro are similar)
ByWeiwei Jia Mar 24, 2018Jan 7, 2020

When we compile some project, it needs older version gcc/g++ version. So how to insall older ones in ubuntu 16? Install older gcc/g++ version sudo apt-get install gcc-4.4 g++-4.4 g++-4.4-multilib gcc-4.4-multilib Set gcc/g++ version to be used automatically sudo update-alternatives –install /usr/bin/gcc gcc /usr/bin/gcc-4.4 50 sudo update-alternatives –install /usr/bin/g++ gcc /usr/bin/g++-4.4 50 You may need…

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