Kernel tips and tricks

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Revision as of 09:47, 23 July 2023 by Admin (talk | contribs) (Created page with " == perf interrupt took too long in system log == phenomenon system log shows "perf interrupt took too long (aaa > bbb), lowering kernel.perf_event_max_sample_rate to ccc" Action 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...")
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perf interrupt took too long in system log

phenomenon

system log shows "perf interrupt took too long (aaa > bbb), lowering kernel.perf_event_max_sample_rate to ccc"


Action

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[1]

References

  1. ↑ https://bbs.archlinux.org/viewtopic.php?id=187636
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