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Re: kernel: perf: interrupt took too long

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On 5/24/2021 5:55 AM, Richard Hector wrote:
> Hi all,
>
> I see messages like this frequently for a day or two after rebooting a
> particularly slow old machine (Atom-based HP thin client, running as an
> OpenVPN endpoint):
>
> May 23 05:36:37 ovpn kernel: [14268.392418] perf: interrupt took too
> long (4020 > 3996), lowering kernel.perf_event_max_sample_rate to 49750
>
> Would it be a good idea to set this value at boot time, rather than
> waiting for it to auto-adjust down till it settles?
>
> Actually I don't know if it's because the machine is slow; it's just the
> only machine I see this on.
>

At the time I've looked at this, I came to the conclusion that a cure
was worse than the illness.

--
John Doe

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kernel: perf: interrupt took too long Richard Hector <richard@walnut.gen.nz> - 2021-05-24 06:00 +0200
  Re: kernel: perf: interrupt took too long The Wanderer <wanderer@fastmail.fm> - 2021-05-24 12:00 +0200
    Re: kernel: perf: interrupt took too long Richard Hector <richard@walnut.gen.nz> - 2021-05-27 07:40 +0200
  Re: kernel: perf: interrupt took too long john doe <johndoe65534@mail.com> - 2021-05-25 11:20 +0200
    Re: kernel: perf: interrupt took too long Toni Mas Soler <antomassol@protonmail.com> - 2021-05-25 12:10 +0200

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