Kworkers, Kworkers

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Kworkers, Kworkers

Volker Wysk
Hi

Again, those pesky kworker threads are taking over my machine. Right now, I'm having 45 of those. The hard disk is working all the time, but this doesn't slow down the system. Probably because I also have an SSD.

Does anyone know, what this is about? Is it a known (kernel) bug? Should I worry? How to get rid of those things ...?

Bye
Volker


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Re: Kworkers, Kworkers

Teresa e Junior
Em 15/05/2018 09:38, Volker Wysk escreveu:
> Hi
>
> Again, those pesky kworker threads are taking over my machine. Right now, I'm having 45 of those. The hard disk is working all the time, but this doesn't slow down the system. Probably because I also have an SSD.
>
> Does anyone know, what this is about? Is it a known (kernel) bug? Should I worry? How to get rid of those things ...?
>
> Bye
> Volker

I have 30, never have noticed any problem! Have you tried checking with
iotop what exactly is spinning the disk?

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Re: Kworkers, Kworkers

Volker Wysk
Am Dienstag, 15. Mai 2018, 10:48:52 CEST schrieb Teresa e Junior:

> Em 15/05/2018 09:38, Volker Wysk escreveu:
> > Hi
> >
> > Again, those pesky kworker threads are taking over my machine. Right now, I'm having 45 of those. The hard disk is working all the time, but this doesn't slow down the system. Probably because I also have an SSD.
> >
> > Does anyone know, what this is about? Is it a known (kernel) bug? Should I worry? How to get rid of those things ...?
> >
> > Bye
> > Volker
>
> I have 30, never have noticed any problem! Have you tried checking with
> iotop what exactly is spinning the disk?

I'm new to iotop. At the top of the list are just kworkers, most of the time. Occasionally the top looks something like this:

Total DISK READ :    1010.91 K/s | Total DISK WRITE :       0.00 B/s
Actual DISK READ:    1129.84 K/s | Actual DISK WRITE:    1070.38 K/s
  TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND                                                                                                                        
 6702 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.64 % [kworker/u16:8]
  152 be/4 root      891.98 K/s    0.00 B/s  0.00 %  0.00 % [kworker/6:2]
 4553 be/4 root      118.93 K/s    0.00 B/s  0.00 %  0.00 % [kworker/2:0]
    1 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % init splash
    2 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kthreadd]
    3 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [ksoftirqd/0]
    5 be/0 root        0.00 B/s    0.00 B/s  0.00 %  0.00 % [kworker/0:0H]

That "init splash" entry comes often...

What does that tell you..?  There is no documentation on the "TID" column in the man page.

Greetings
Volker


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