Core working at 80% when the HDD connected

sergiors · 2014-04-24 06:18:15

Hi

I'm having a problem when my HDD is connected.

After boot, a core is working at 80%, but if disconnect the HDD, all working well.

This with the HDD not mounted.

Anyone knows how to fix it?

PS: I'm using an SSD as primary partition.

Last edited by sergiors (2014-04-24 06:30:39)

x33a · 2014-04-24 06:29:31

Can you please elaborate? Is it an external HDD you are talking about?

Also, do the cores continuously run at high load unless you remove the HDD?

Try monitoring disk activity during that time using iotop, also see which process is consuming cpu during that time using top or htop.

sergiors · 2014-04-24 15:58:57

x33a, yes, is an external HDD, but I put the HDD into the DVDRW slot.

The cores working well when HDD is disconnected.

iotop

without HDD connected

with HDD

Last edited by sergiors (2014-04-24 18:18:31)

x33a · 2014-04-24 16:21:51

Interestingly, htop doesn't show which process is consuming the cpu. Maybe it's a kernel thread.

Can you use post the output of top instead (when the load is high). Also, please post the output of iotop when load is high.

PS: Please use smaller thumbnails for your images https://wiki.archlinux.org/index.php/Fo … s_and_Code

sergiors · 2014-04-24 17:23:43

top output

iotop

Last edited by sergiors (2014-04-24 18:18:40)

Pse · 2014-04-24 17:34:14

Disable dropbox and check if it happens.

sergiors · 2014-04-24 17:54:07

Pse, I already tried =/

Last edited by sergiors (2014-04-24 17:54:24)

sergiors · 2014-04-24 18:07:13

It seems is the kworker. I searched and found other people with same problem

o_caino · 2014-04-24 18:07:42

Check the Debugging section.
https://raw.github.com/torvalds/linux/m … kqueue.txt

Also, edit your other posts to conform to the Forum Etiquette.

Inxsible · 2014-04-24 18:08:22

sergiors, Do not post full size images. You have been here long enough to know the forum rules. Make use of an image hosting website and post a link or thumbnail here.

sergiors · 2014-04-24 18:17:24

So sorry, Inxsible

anatolik · 2014-04-24 18:58:08

Could you please capture CPU usage by "sudo perf top -g"? It will show in what exactly kernel function CPU cycles are spend - just unfold the function call graph by clicking "+".

And the best of all to report this information to kernel ML as I think this is a kernel bug.

sergiors · 2014-04-24 19:16:13

I know how to capture it in text.

sudo perf top -g output

Last edited by sergiors (2014-04-24 19:18:47)

anatolik · 2014-04-24 19:24:01

"sudo perf record -a -g" for a minute then ^C and then "sudo perf report -g > some_file.txt" should save the data in text form.

So I would blame either device driver or acpi part of the kernel. Google for the function names and if there is anything relevant - report the problem to kernel ML.

sergiors · 2014-04-24 19:41:08

The log was too large to post here

https://www.dropbox.com/s/4r5rtbzlawerkyr/perf.txt

Arch Linux

#1 2014-04-24 06:18:15

Core working at 80% when the HDD connected

#2 2014-04-24 06:29:31

Re: Core working at 80% when the HDD connected

#3 2014-04-24 15:58:57

Re: Core working at 80% when the HDD connected

#4 2014-04-24 16:21:51

Re: Core working at 80% when the HDD connected

#5 2014-04-24 17:23:43

Re: Core working at 80% when the HDD connected

#6 2014-04-24 17:34:14

Re: Core working at 80% when the HDD connected

#7 2014-04-24 17:54:07

Re: Core working at 80% when the HDD connected

#8 2014-04-24 18:07:13

Re: Core working at 80% when the HDD connected

#9 2014-04-24 18:07:42

Re: Core working at 80% when the HDD connected

#10 2014-04-24 18:08:22

Re: Core working at 80% when the HDD connected

#11 2014-04-24 18:17:24

Re: Core working at 80% when the HDD connected

#12 2014-04-24 18:58:08

Re: Core working at 80% when the HDD connected

#13 2014-04-24 19:16:13

Re: Core working at 80% when the HDD connected

#14 2014-04-24 19:24:01

Re: Core working at 80% when the HDD connected

#15 2014-04-24 19:41:08

Re: Core working at 80% when the HDD connected

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