Arch Linux

soloturn

Member

Registered: 2016-04-18

Posts: 5

continuous disk access from kworker, jbd2

hi,

i run arch of a memory stick, standard install. tere is disk activity every second. i saw a couple of messages in the web, also commands to execute. how would i best interpret the below commands results?

$ sudo iotop -Pa
  158 be/3 root          0.00 B      8.00 K  0.00 %  0.05 % [jbd2/sdb2-8]
 4743 be/4 root          0.00 B      0.00 B  0.00 %  0.01 % [kworker/1:0]

$ sudo iotop -boqqq
 4743 be/4 root        0.00 B/s    0.00 B/s  0.00 %  0.03 % [kworker/1:0]
  158 be/3 root        0.00 B/s   11.41 K/s  0.00 %  0.45 % [jbd2/sdb2-8]

$ sudo perf top -g -p 4743
-   77.73%     0.96%  [kernel]    [k] worker_thread                                                                              ▒
   - 9.40% worker_thread                                                                                                         ▒
        8.28% schedule                                                                                                           ▒
           __schedule                                                                                                            ▒
        7.88% process_one_work                                                                                                   ▒
-   63.88%     0.21%  [kernel]    [k] process_one_work                                                                           ▒
   - 5.81% process_one_work                                                                                                      ▒
        6.90% disk_events_workfn                                                                                                 ▒
        3.16% vmstat_update                                                                                                      ▒
-   61.61%     0.02%  [kernel]    [k] disk_check_events                                                                          ▒
   - 13.04% disk_check_events                                                                                                    ▒
        13.94% sd_check_events                                                                                                   ▒
        5.86% scsi_test_unit_ready                                                                                               ▒
-   53.29%     5.86%  [scsi_mod]  [k] scsi_test_unit_ready                                                                       ▒
   - 6.04% scsi_test_unit_ready                                                                                                  ▒
        scsi_execute_req_flags

Last edited by soloturn (2016-05-21 13:26:47)

dmorilha

Member

Registered: 2016-09-11

Posts: 3

Re: continuous disk access from kworker, jbd2

I do have the exact same problem on a rpi3 running arch but not on a rpi2 with very similar installation. Could it be related with the SSD quality?