http://bugzilla.opensuse.org/show_bug.cgi?id=911520
--- Comment #5 from Jan Ritzerfeld
You must be right there. However I investigated it further today in several machines I maintain, and wasn't able to spot a huge difference in wakeups between 13.1 and 13.2.
That's strange. I set up two virtualbox machines (512MB RAM, 1 CPU) with the default openSUSE 13.1 and 13.2 installations. mysqld causes 5-7 wakeups per second on 13.1 and 10-12 on 13.2. That are about 50% of the total number of wakeups in both cases (ignoring VBoxClient on 13.1). And, 13.2 increased them by 100%! However, they do not match the 25 wakeups per second I reported. Thus, I assigned them 2 CPUs and tested again. Now, mysqld causes 18-25 wakeups on 13.2 and 11-17 on 13.1. Again that are about 50% of the total number of wakeups in both cases (ignoring VBoxClient on 13.1). And, 13.2 increased them up to 60%.
They were fluctuating between 10 and 25 in both versions.
Here, they do not fluctuate that much here if you wait a few minutes without "touching" the computer. I.e., no mouse movements, no keyboard strokes...
I even installed mariadb 10 in a 13.1 machine and didn't notice any downgrade in that aspect.
That will be the next test here.
I wonder whether the increased wakeups you are observing, are due to changes in Akonadi and the rest of the apps that depend on it.
I would not exclude this possibility, but nothing else causes any significant amount of wakeups, i.e. more than 1 per second, including any akonadi related process. However, when using 13.2, my real machine and the virtualbox, both with 2 CPUs, show an huge increase in the number of wakeups for nscd and KDE konsole. Maybe it is a multi-CPU kernel "problem"? Or powertop is misreporting in case of more than 1 CPU. -- You are receiving this mail because: You are on the CC list for the bug.