On Thu, Dec 15 2016, Jure Erznožnik wrote: > Thanks for helping Neil. I have run the suggested utilities and here > are my findings: > > It is always [kworker/x:yy] (x:yy changes somewhat) or [0]. > A few lines from one of the outputs: That's disappointing. "kworker" could be any work queue. It might be useful to look for large scale patterns. What different addresses are written to? Is there are regular pattern? What is the period? md doesn't use work_queues for IO so these much be coming from elsewhere. bcache uses a few work-queues... NeilBrown > > 9,0 3 0 0.061577998 0 m N raid5 rcw 3758609392 2 2 0 > 9,0 3 0 0.061580084 0 m N raid5 rcw 3758609400 2 2 0 > 9,0 3 0 0.061580084 0 m N raid5 rcw 3758609400 2 2 0 > 9,0 3 0 0.061580084 0 m N raid5 rcw 3758609400 2 2 0 > 9,0 3 0 0.061580084 0 m N raid5 rcw 3758609400 2 2 0 > 9,0 0 1 0.065333879 283 C W 11275825480 [0] > 9,0 0 1 0.065333879 283 C W 11275825480 [0] > 9,0 0 1 0.065333879 283 C W 11275825480 [0] > 9,0 0 1 0.065333879 283 C W 11275825480 [0] > 9,0 3 2 1.022155200 2861 Q W 11275826504 + 32 [kworker/3:38] > 9,0 3 2 1.022155200 2861 Q W 11275826504 + 32 [kworker/3:38] > 9,0 3 2 1.022155200 2861 Q W 11275826504 + 32 [kworker/3:38] > 9,0 3 2 1.022155200 2861 Q W 11275826504 + 32 [kworker/3:38] > 9,0 0 2 1.054590402 283 C W 11275826504 [0] > 9,0 0 2 1.054590402 283 C W 11275826504 [0] > 9,0 0 2 1.054590402 283 C W 11275826504 [0] > 9,0 0 2 1.054590402 283 C W 11275826504 [0] > 9,0 3 3 2.046065106 2861 Q W 11275861232 + 8 [kworker/3:38] > 9,0 3 3 2.046065106 2861 Q W 11275861232 + 8 [kworker/3:38] > 9,0 3 3 2.046065106 2861 Q W 11275861232 + 8 [kworker/3:38] > 9,0 3 3 2.046065106 2861 Q W 11275861232 + 8 [kworker/3:38] > 9,0 0 0 2.075247515 0 m N raid5 rcw 3758619888 2 0 1 > 9,0 0 0 2.075247515 0 m N raid5 rcw 3758619888 2 0 1 > 9,0 0 0 2.075247515 0 m N raid5 rcw 3758619888 2 0 1 > 9,0 0 0 2.075247515 0 m N raid5 rcw 3758619888 2 0 1 > 9,0 0 0 2.075250686 0 m N raid5 rcw 3758619888 2 2 0 > 9,0 0 0 2.075250686 0 m N raid5 rcw 3758619888 2 2 0 > 9,0 0 0 2.075250686 0 m N raid5 rcw 3758619888 2 2 0 > 9,0 0 0 2.075250686 0 m N raid5 rcw 3758619888 2 2 0 > 9,0 2 1 2.086924691 283 C W 11275861232 [0] > 9,0 2 1 2.086924691 283 C W 11275861232 [0] > 9,0 2 1 2.086924691 283 C W 11275861232 [0] > 9,0 2 1 2.086924691 283 C W 11275861232 [0] > 9,0 0 3 2.967340614 1061 Q FWS [kworker/0:18] > 9,0 0 3 2.967340614 1061 Q FWS [kworker/0:18] > 9,0 0 3 2.967340614 1061 Q FWS [kworker/0:18] > 9,0 0 3 2.967340614 1061 Q FWS [kworker/0:18] > 9,0 3 4 3.070092310 2861 Q W 11275861272 + 8 [kworker/3:38] > 9,0 3 4 3.070092310 2861 Q W 11275861272 + 8 [kworker/3:38] > 9,0 3 4 3.070092310 2861 Q W 11275861272 + 8 [kworker/3:38] > 9,0 3 4 3.070092310 2861 Q W 11275861272 + 8 [kworker/3:38] > 9,0 0 0 3.101966398 0 m N raid5 rcw 3758619928 2 0 1 > 9,0 0 0 3.101966398 0 m N raid5 rcw 3758619928 2 0 1 > 9,0 0 0 3.101966398 0 m N raid5 rcw 3758619928 2 0 1 > 9,0 0 0 3.101966398 0 m N raid5 rcw 3758619928 2 0 1 > 9,0 0 0 3.101969169 0 m N raid5 rcw 3758619928 2 2 0 > 9,0 0 0 3.101969169 0 m N raid5 rcw 3758619928 2 2 0 > 9,0 0 0 3.101969169 0 m N raid5 rcw 3758619928 2 2 0 > 9,0 0 0 3.101969169 0 m N raid5 rcw 3758619928 2 2 0 > 9,0 0 4 3.102340646 283 C W 11275861272 [0] > 9,0 0 4 3.102340646 283 C W 11275861272 [0] > 9,0 0 4 3.102340646 283 C W 11275861272 [0] > 9,0 0 4 3.102340646 283 C W 11275861272 [0] > 9,0 3 5 4.094666938 2861 Q W 11276014160 + 336 > [kworker/3:38] > 9,0 3 5 4.094666938 2861 Q W 11276014160 + 336 > [kworker/3:38] > 9,0 3 5 4.094666938 2861 Q W 11276014160 + 336 > [kworker/3:38] > 9,0 3 5 4.094666938 2861 Q W 11276014160 + 336 > [kworker/3:38] > 9,0 3 0 4.137869804 0 m N raid5 rcw 3758671440 2 0 1 > 9,0 3 0 4.137869804 0 m N raid5 rcw 3758671440 2 0 1 > 9,0 3 0 4.137869804 0 m N raid5 rcw 3758671440 2 0 1 > 9,0 3 0 4.137869804 0 m N raid5 rcw 3758671440 2 0 1 > 9,0 3 0 4.137872647 0 m N raid5 rcw 3758671448 2 0 1 > 9,0 3 0 4.137872647 0 m N raid5 rcw 3758671448 2 0 1 > 9,0 3 0 4.137872647 0 m N raid5 rcw 3758671448 2 0 1
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