[SOLVED] Re: kworker eats 45% from first cpu

[deloptes <deloptes@gmail.com>]

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*