1

A couple of days ago I set-up e4rat for my Ubuntu 14.04 running on a Lenovo Ideapad U330. The first couple of days it really did wonders, basically cutting the boot-time from 50sec to 25sec.

Then all of a sudden, for no (obvious) reasons it took 20sec longer again. The change actually happened from a boot at ~1am compared to a boot the next morning ~9am. Ever since, it's been stuck at the 45sec mark.

I tried to look at my boot-charts and you can actually see that before e4rat-preload started at ~5secs in the boot-process and now it starts at ~25secs. The strange thing is: from 5 until 25secs there is nothing at all happening, at least according to the bootchart. In the boot process e4rat-preload is taking incredibly much time now at the point where it says loading I-Nodes. That part was a lot faster before.

If anyone has any idea on how to fix this, I'd be more than happy. Thanks in advance for your effort.!

Here are the before/after bootcharts. I cut them a little, to show the important part in the beginning. Apart from that, they look very much similar. If it helps I can of course add the whole charts. (obs: it really was the same day, without any major updates etc.)

before bootchart

after bootchart

hopfi
  • 51
  • 4

1 Answers1

1

I have figured it out myself now.

Actually (of course) there had been something I changed between those two boot events. Trying to make my laptop boot to low screen brightness by default, I used the following answer here.

In a nutshell: I updated my 

/etc/rc.local

file, in a way that it would run 

echo X > /sys/class/backlight/intel_backlight/brightness

in the boot process. (click here for more info on rc.local)

I don't really understand why, but it is apparently interfering strongly with e4rat-preload.

Taking away this statement I end up at ~25sec boot time again.

Hope this will be of help for similar problems.

Community
  • 1
hopfi
  • 51
  • 4