zswap metrics with Telegraf

A couple of weeks ago I discover zswap. zswap is a Linux kernel feature that provides a compressed write-back cache for swapped pages, as a form of virtual memory compression. Instead of moving memory pages to a swap device when they are to be swapped out, zswap performs their compression and then stores them into a memory pool dynamically allocated in the system RAM. Later writeback to the actual swap device is deferred or even completely avoided, resulting in a significantly reduced I/O for Linux systems that require swapping; the tradeoff is the need for additional CPU cycles to perform the compression....

July 19, 2017 · Dennis Kruyt

Imperial march on floppy drives

Just for fun, try to play music with old floppy drives and an Arduino.

March 24, 2012 · Dennis Kruyt

Equilux a Arduino clock

I created a Arduino controled led clock with 60 rgb led’s. This one is inspired by the Equinox Clock from Bram Knaapen. LED strip For the 60 RGB leds I use a string of RGB leds that I order directly from China, each of those leds has a LPD6803 IC. A arduino library for this string can be found at adafruit’s github. Time Keeping For time keeping I am using a a RTC DS1307 that is connected via I2C to pin A4 and A5 on the Arduino....

June 17, 2011 · Dennis Kruyt

Read Magnetic cards with an Arduino

Found an old magnetic card reader. I hooked it up to an Arduino to read magnetic cards.

July 3, 2010 · Dennis Kruyt

Inlinefeed a Wordpress plugin to display RSS feeds

This is not working any more just for historical purpose. With the inlinefeed plugin you can display and embed RSS/ATOM feeds in your Wordpress posts and pages. You can use the following shortcode within Wordpress: [inlinefeed rss_feed_url="http://feed.xml"] NOTE: From version 2.0 you can only use the shortcode [inlinefeed], the old style rss:[URL]; doesn’t work anymore! If you upgrade from a 1.xx version, then you must change from rss:[URL] to [inlinefeed rss_feed_url=”http://feed....

April 28, 2009 · Dennis Kruyt

Grease Monkey: Flickramio

Flickramio is a Greasemonkey script that put 2 google earth map’s next to the photo if the image is geotagged, so Flickr looks a little more like Panoramio.

April 24, 2009 · Dennis Kruyt