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2026-04-20 - 10:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #8

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click here to display the system's profile data or here to proceed to next system.
Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackbslot8s (updated Mon Apr 20, 2026 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
280877099160160,0cyclictest0-21swapper/219:53:472
280877099126111,14cyclictest2815544-21diskstats19:20:132
280877099122108,14cyclictest31-21ksoftirqd/219:56:392
280877099119105,14cyclictest31-21ksoftirqd/219:15:552
280877099119104,15cyclictest31-21ksoftirqd/219:33:432
280877099118104,14cyclictest31-21ksoftirqd/220:00:462
280877099118103,15cyclictest31-21ksoftirqd/219:48:432
280877099117103,14cyclictest31-21ksoftirqd/220:08:292
280877099117103,14cyclictest31-21ksoftirqd/219:36:082
280877099117103,14cyclictest31-21ksoftirqd/219:11:242
2808254211788,9sleep50-21swapper/519:06:085
28082892116101,10sleep40-21swapper/419:06:394
28084772115100,10sleep60-21swapper/619:09:216
28084912114100,9sleep20-21swapper/219:09:342
28083912114100,9sleep30-21swapper/319:08:063
2808350211499,10sleep00-21swapper/019:07:320
2808451211298,9sleep70-21swapper/719:08:587
28087709911198,13cyclictest2826618-21ntp_states19:40:172
2808369210994,10sleep10-21swapper/119:07:481
280877099106106,0cyclictest0-21swapper/219:25:072
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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