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100% IO doesn't mean it's using all your IO operations. It means it's doing nothing but waiting on IO. Therefore, high %IO with low/zero disk bandwidth can be normal. man iotop: [...] It also displays the percentage of time the thread/process spent while swapping in and while waiting on I/O. It may be a different issue if your kworker is ...


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You can dump disk activities (along with the pid generating it) in syslog with the following command: echo 1 > /proc/sys/vm/block_dump Before issuing this, make sure that your system logs aren't on a block device, otherwise you'll end up in an infinite loop.



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