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2026-07-14 - 02:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #3

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 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.

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 50 highest latencies:
System rack7slot3s.osadl.org (updated Mon Jul 13, 2026 12:43:36)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2896622980,1sleep10-21swapper/107:10:171
291769913624,29cyclictest12103-21/usr/sbin/munin09:15:450
29176991175,84cyclictest0-21swapper/011:10:410
29176991142,22cyclictest8050irq/56-dwc_otg_10:25:330
29176991057,72cyclictest0-21swapper/008:40:230
2917699962,77cyclictest8746-21ps09:10:440
2917699953,65cyclictest0-21swapper/010:40:210
29176999256,12cyclictest0-21swapper/010:35:410
29176998652,28cyclictest0-21swapper/008:45:320
2917699816,67cyclictest0-21swapper/009:05:300
29179997723,26cyclictest8050irq/56-dwc_otg_10:25:333
94012730,2sleep30-21swapper/311:09:313
2917699715,30cyclictest0-21swapper/008:20:310
59502700,6sleep12917799cyclictest10:25:411
58122700,3sleep123-21ksoftirqd/111:44:161
156162700,3sleep10-21swapper/111:55:391
2917699692,32cyclictest0-21swapper/010:00:290
29176996921,22cyclictest0-21swapper/010:10:290
125492670,2sleep112548-21ssh12:30:461
40902660,4sleep14089-21wc09:00:181
2917799662,28cyclictest7850irq/56-dwc_otg10:35:431
28062660,2sleep30-21swapper/309:42:473
49372650,2sleep30-21swapper/311:42:413
189712650,2sleep30-21swapper/308:10:373
2917999643,43cyclictest17690-21ssh10:40:193
29178996314,28cyclictest0-21swapper/210:35:412
29176996336,6cyclictest8050irq/56-dwc_otg_12:10:170
2917899612,53cyclictest11157-21ls11:10:422
29177996116,30cyclictest13048-21ssh09:15:461
2917999602,4cyclictest0-21swapper/309:50:283
29178996016,26cyclictest518-21rs:main2
2917999584,26cyclictest0-21swapper/309:15:453
29178995813,24cyclictest7950irq/56-dwc_otg_10:40:202
29176995836,5cyclictest7950irq/56-dwc_otg_09:45:290
2917699581,33cyclictest5115-21unixbench_multi07:30:460
29176995813,23cyclictest12898-21latency_hist07:55:170
2917699581,23cyclictest0-21swapper/011:00:310
29179995714,20cyclictest8782-21processes09:10:453
29177995716,17cyclictest7950irq/56-dwc_otg_09:10:431
2917699579,24cyclictest7021-21cron12:25:170
2917699571,26cyclictest16067-21grep12:35:360
2917999563,35cyclictest11263-21grep11:10:443
29179995629,13cyclictest0-21swapper/310:55:313
2917699567,28cyclictest3401-21unixbench-2d08:55:460
29176995632,7cyclictest7950irq/56-dwc_otg_09:30:460
29176995628,16cyclictest22274-21apt11:25:170
29176995628,16cyclictest22274-21apt11:25:170
2917699561,5cyclictest8710-21grep07:40:450
2917699555,47cyclictest0-21swapper/009:25:170
29176995528,15cyclictest15617-21grep11:15:470
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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