[SOLVED] Re: kworker eats 45% from first cpu
deloptes wrote:
> deloptes wrote:
>
>> Hi community,
>> I moved my system to an SSD two days ago. I applied recommendation to
>> use "discard" when I noticed that one kworker is using exactly 45% of the
>> first cpu.
>
>
> perf says
>
>
> 55.13% [kernel] [k] acpi_os_read_port
> 26.65% [kernel] [k] acpi_os_write_port
> 8.33% [kernel] [k] __next_timer_interrupt
> 5.41% libglib-2.0.so.0.4200.1 [.]
> g_io_channel_get_buffer_condition
>
>
> ./perf top -a
>
> so we now know where the cpu power goes - do you have any idea of this?
>
> regards
Based on these posts
https://bugs.freedesktop.org/show_bug.cgi?id=90014
http://askubuntu.com/questions/176565/why-does-kworker-cpu-usage-get-so-high
I found out gpe4D is causing the problem on my system
# echo disable > /sys/firmware/acpi/interrupts/gpe4D 2>/dev/null
solved the problem
regards
PS: to find out use
# grep . /sys/firmware/acpi/interrupts/gpe*
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