On 03/20/2016 12:24 PM, Martin Steigerwald wrote:

quoted

btrfs kworker thread uses up 100% of a Sandybridge core for minutes on

quoted

random write into big file
https://bugzilla.kernel.org/show_bug.cgi?id=90401

I think I saw this up to kernel 4.3. I think I didn´t see this with 4.4 
anymore and definately not with 4.5.

So it may be fixed.

Did anyone else see kworker threads using 100% of a core for minutes with 4.4 
/ 4.5?

I run 4.8rc5 and currently see this issue. kworking has been running at
100% for hours now, seems stuck there.

Anything I should look at in order to narrow this down to a root cause?


Regards

Christian