Here is a Chart with the results of using readahead on my system (47k image)

I also increased the detail level of the chart.

The bad news: Using readahead actually made my bootup slower.

And not just a little bit slower, but a lot. gdm login used to be started after around 30 seconds before, now it is at 57 seconds. That is factor 2!

I’m not sure why, I need to investigate what actually got into my readahead file lists… My whole MySQL databases? All my fonts? ;-)