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I am using make oldconfig and don't know that to do now. (Usually I can make a choice by myself)

*
* CPU/Task time and stats accounting
*
Cputime accounting
> 1. Simple tick based cputime accounting (TICK_CPU_ACCOUNTING) (NEW)
  2. Fine granularity task level IRQ time accounting (IRQ_TIME_ACCOUNTING)
choice[1-2]: 

Seems like IRQ_TIME_ACCOUNTING might have a negative influence performance but was the default before. What to chose?

I am using the notebook mostly for java development debian, firefox, eclipse or intellij.

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After a little more google search I found the answer, better said the kernel help, in form of a patch. As usual it is helpful: patchwork.kernel.org/patch/546141 + bool "Fine granularity task level IRQ time accounting" + default n + ---help--- + Select this option to enable fine granularity task irq time + accounting. This is done by reading a timestamp on each + transitions between softirq and hardirq state, so there can be a + small performance impact. + + If in doubt, say N here. – dedeibel Feb 23 '13 at 18:21
    
You may want to expand your final solution into an answer below to help people searching for similar issues in the future. – Eric G Feb 23 '13 at 19:23
    
Yeah, but my reputation doesn't allow me to answer for another 7 hours :-) Will do after that. – dedeibel Feb 23 '13 at 20:53
up vote 1 down vote accepted

After a little more google search I found the answer, better said the kernel help, in form of a patch. As usual it is helpful:

https://patchwork.kernel.org/patch/546141/

+   bool "Fine granularity task level IRQ time accounting"
+   default n
+   ---help---
+     Select this option to enable fine granularity task irq time
+     accounting. This is done by reading a timestamp on each
+     transitions between softirq and hardirq state, so there can be a
+     small performance impact.
+
+     If in doubt, say N here.
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