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To gather some metrics, cumulative :

iotop -P -a

On one server (Linux 2.6.18-348.6.1.el5, centos 5.9) iotop (iotop 0.4.3) shows :

5 be/7 root          0.00 B      0.00 B -125056859448.21 %  0.20 % [ksoftirqd/1]

6 rt/3 root          0.00 B      0.00 B -574104403438.82 %  0.00 % [migration/2]

migration slowly falls and about 60 seconds later it will be out of the realtime output screen.

ksoftirq remains listed with this weird negative 'SWAPIN %'.

Question : is this value a trivial bug of iotop or can it outline a real problem ?

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  • Have you tried restarting your server?? Commented Jul 14, 2017 at 8:21
  • it isn't possible during working hours, the restart will be next saturday night Commented Jul 14, 2017 at 9:46
  • I think you should try htop.It might help you find the bug. Commented Jul 14, 2017 at 10:45

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