Kworker has 100% cpu usage. Why?

I thought that setting
options usbcore autosuspend=0
in /etc/modprobe.d/modprobe.conf fixed the problem for me of kworker using 100% CPU. I found the solution here. Using the setting prevented kworker from kworking right after boot, but it till starts kworking a some point into my sessions. EDIT: Nope, I guess it's random because it's happening at boot again.
Why might this be?
Last edited by trusktr (2014-07-29 20:46:54)

Here's some of the output of `perf`, Samples: 40K of event 'cycles', - 45.58% kworker/0:1 [kernel.kallsyms] - native_read_tsc - 59.68% delay_tsc __delay __const_udelay - 0xffffffffa0603076 - 59.95% 0xffffffffa0603159 - 66.11% 0xffffffffa060357a - 50.12% 0xffffffffa0603d53 acpi_ev_notify_dispatch acpi_os_execute_deferred process_one_work worker_thread kthread ret_from_fork - 49.88% 0xffffffffa0603d30 acpi_ev_notify_dispatch acpi_os_execute_deferred process_one_work worker_thread kthread ret_from_fork - 33.89% 0xffffffffa0603d93 acpi_ev_notify_dispatch acpi_os_execute_deferred process_one_work worker_thread kthread ret_from_fork + 40.05% 0xffffffffa06032f8 + 40.31% __delay + 45.00% kworker/0:1 [kernel.kallsyms] + 7.85% kworker/0:1 [apple_gmux] + 0.84% kworker/0:1 [apple_gmux] + 0.09% swapper [kernel.kallsyms] + 0.02% kworker/0:1 [apple_gmux] + 0.02% X nvidia_drv.so + 0.02% irq/49-(null) [libahci] (alternatively, with syntax highlight: http://hastebin.com/qekisivexe.erlang_repl)
Event count (approx.): 37835553150
[k] native_read_tsc ▒
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[k] delay_tsc ▒
[k] 0x0000000000000063 ▒
[k] 0x000000000000006a ▒
[k] intel_idle ▒
[k] 0x0000000000000165 ▒
[.] 0x0000000000067e7f ▒
[k] 0x0000000000001994 ▒

/> they basically all look the same. It seems like the problem has to do with ACPI. I tried the solutions in the linked thread, but they didn't work.

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Hit "ENTER" key
Restart your computer.
If you do get a prompt after restart windows to remap LSP, just click NO.
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Message was edited by:
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I had a similar problem with iTunes.
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URL source: http://www.hotcomm.com/faq/FAQ_ResetWinsock.asp
Good Luck
Copyright (c) 2009 1stWorks Corporation. All rights reserved.
This article gives instructions for resetting Winsock on Windows XP and Windows Vista:
Reset Winsock (Vista)
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3. Type netsh winsock reset in the Command Prompt shell, and then press the Enter key.
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Pause the game when u alt-tab away ^_^
Thats what most native fullscreen games do (the
non-networked kind atleast)Good idea, but the crux of the issue is really the underlying scheduler which allows
the thread to race.
How to "Eliminate" 100% CPU usage.
Tony's Law of the exec constant. <<<<"Any thread or process running on a non-preemptive operating system MUST NOT use blocking
IO, and MUST preempt itself at leat 20MS per iteration."
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>>> Do NOT use Thread.sleep() <<< but instead use Object.wait();
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ie:
InputStream inputStream;
while(working)
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int totalBytes = 10;
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The 100% CPU issue is especially bad under NT BTW.
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Good Luck!
(T)

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Hi,
There is a similar thread, please change the performance options in WSB from fast to normal:
wbengine.exe taking all CPU
http://social.technet.microsoft.com/Forums/en-US/be5d5743-1ea7-4c26-8072-0c010b47dd9a/wbengineexe-taking-all-cpu?forum=winserveressentials
If the issue still exists, please check if there any error message in the Event Log.
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We
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You mention usb...I'm not using any usb devices but will gladly kill it in DM if that is what you are suggesting for a test run.

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