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I recently upgraded to the Kubuntu Natty Beta 1 and I've been having a lot of issues with this process kworker. At moments it uses almost half my CPU. Also strangely it seems to affect my USB ports since when ever i plug in an USB drive the process kworker goes into hyperdrive, leaving me unable to work. I have thought about filling a bug but since i haven't even found any reasonable explanation on what kworker is i figured i should first find out.
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"kworker" is a placeholder process for kernel worker threads, which perform most of the actual processing for the kernel, especially in cases where there are interrupts, timers, I/O, etc. These typically correspond to the vast majority of any allocated "system" time to running processes. It is not something that can be safely removed from the system in any way, and is completely unrelated to nepomuk or KDE (except in that these programs may make system calls, which may require the kernel to do something). There were some reports of excessing kworker activity for relatively idle systems starting during 2.6.36 development ( https://lkml.org/lkml/2011/3/29/2 is one example discussion ), and wide reports of confusion and problems with 2.6.38 (although many of these reports include the word "Natty", so I presume these people not to have used any kernel between 2.6.35 (distributed in Ubuntu 10.10) and 2.6.38 (distributed in Ubuntu 11.04). I've found many reports of something that "fixed" this for one or another user. Most "fixes" seem to be related to updates of the kernel of various sorts. Where the update can be tracked to a specific issue, it seems to often be some driver or kernel service that has been patched to not misbehave: I have the impression that there are a very large number of things in the kernel that can cause a behaviour which is observed as excessive kworker usage. If you find the system unusable due to excessive kworker activity, I would recommend trying to do fewer things. If you think you're not doing anything, try shutting down long-running services or timers (RSS readers, mail readers, file indexers, activity trackers, etc.). If this doesn't work, try restarting. If your system allows you to enable or disable hardware in a preboot environment, try turning off hardware you aren't using. If it happens on every restart before you do anything, you could try uninstalling things, but at this point you'll want to be running syscall profiling tools to track down specific applications that seem to be causing this overload. It is to be hoped that your specific system will stop expressing this behaviour with a future kernel upgrade (and many of the most common causes of this have been solved). | ||||
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First, sorry for my english, I am French I recently installed ubuntu natty on an external drive usb wd passport. When I start on my desktop which must have two years old everything works like a charm. When I start on my new laptop by MSI gt680r system slowdowns after that i wake up computer from sleep or if i plug another usb disk. Kworker processes taking more and more cpu and the mouse freeze from time to time. I have read several solutions on various forums that did not work. I went into the bios of my laptop, there were: Hand XCHI OFF: Enabled EHCI Hand OFF: disabled I changed for Hand XCHI OFF: disabled EHCI Hand OFF: disabled and since I can not see the freeze on natty on my laptop. I would hand enabled when the problem will be corrected. Hope this helps you too. | |||
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On Mac OS X, | |||||||||
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I think disabling Nepomuk can help you: http://www.freetechie.com/blog/disable-nepomuk-desktop-search-on-kde-4-4-2-kubuntu-lucid-10-04/ | |||
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