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vordoo

Member

Registered: 2013-03-24

Posts: 30

[Solved] dmesg: perf interrupt took too long...

Hi,

I get:
perf interrupt took too long (2503 > 2495), lowering kernel.perf_event_max_sample_rate to 50100.
Every ~5 hours in dmesg. 

Intel(R) Pentium(R) 4 CPU 3.00GH
3.16.3-1-ARCH #1 SMP x86_64 GNU/Linux.

Any clue highly appreciated.

Thanks,
v

Last edited by vordoo (2014-10-02 11:06:33)

Spider.007

Member

Registered: 2004-06-20

Posts: 1,175

Re: [Solved] dmesg: perf interrupt took too long...

This is informational and nothing to worry about. It has to do with the Linux perf tool which is included in the kernel. The kernel automagically determines the sample rate that could be used without impacting system performance too much; and it logs this even when perf isn't active, or even installed. Messages like this are triggered by high(er) system load or a cpu that is scaling

vordoo

Member

Registered: 2013-03-24

Posts: 30

Re: [Solved] dmesg: perf interrupt took too long...

Thanks!