Colin Bendell colinbendell

Raspberry Pi 3B+ Using BBR Congestion Control

Check Kernel

uname -r

The kernel version should >= 4.9.4, if isn't, please follow the script below to update kernel:

Update Kernel

sudo rpi-update
sudo reboot

58 bytes of CSS to look great nearly everywhere

When making this website, i wanted a simple, reasonable way to make it look good on most displays. Not counting any minimization techniques, the following 58 bytes worked well for me:

main {
  max-width: 38rem;
  padding: 2rem;
  margin: auto;
}

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	:root {
	--violation-color: red; /* used for clear issues */
	--warning-color: orange; /* used for potential issues we should look into */
	}

	/* IMAGES */

	/*
	* Lazy-Loaded Images Check
	* ====

	var SPA="none";

	if (typeof(app)=="object") SPA = "unknown";

	if (window.hasOwnProperty('require')) {
	if(window.require.hasOwnProperty('defined')){
	if(window.require.defined('troopjs-compose/decorator')) SPA = "troop";
	if(window.require.defined('flight/lib/component')) SPA = "flight";
	}
	}

	# base on ruby 1.9
	# Reference :
	# http://stackoverflow.com/questions/185947/ruby-define-method-vs-def
	# define_method is a (private) method of the object Class. You are calling it from an instance. There is no instance method called define_method, so it recurses to your method_missing, this time with :define_method (the name of the missing method), and :screech (the sole argument you passed to define_method).
	# http://stackoverflow.com/questions/752717/how-do-i-use-define-method-to-create-class-methods
	class Base
	def self.meta_instance_method &block
	define_method "ins", block
	end