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2025-11-25 - 12:27

OSADL QA Farm on Real-time of Mainline Linux

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

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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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 50 highest latencies:
System rack7slot7s.osadl.org (updated Tue Nov 25, 2025 00:43:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8912210680,9sleep10-21swapper/119:07:121
8792210275,9sleep30-21swapper/319:05:393
908828770,13sleep20-21swapper/219:09:272
901428266,11sleep00-21swapper/019:08:280
9217992422,2cyclictest25-21ksoftirqd/122:50:011
9213992420,1cyclictest141rcu_preempt22:30:060
9213992419,3cyclictest13-21ksoftirqd/021:44:460
9213992419,2cyclictest13-21ksoftirqd/021:31:190
9219992320,2cyclictest37850irq/131-snd_hda22:10:182
9223992222,0cyclictest0-21swapper/322:56:113
9219992220,2cyclictest37850irq/131-snd_hda22:03:342
9219992220,2cyclictest37850irq/131-snd_hda00:14:392
9219992220,1cyclictest37850irq/131-snd_hda23:50:422
9219992220,1cyclictest37850irq/131-snd_hda23:21:482
9219992220,1cyclictest37850irq/131-snd_hda23:05:272
9219992220,1cyclictest37850irq/131-snd_hda22:57:552
9219992220,1cyclictest37850irq/131-snd_hda22:52:432
9219992220,1cyclictest37850irq/131-snd_hda22:44:322
9219992220,1cyclictest37850irq/131-snd_hda22:37:242
9219992220,1cyclictest37850irq/131-snd_hda22:28:372
9219992220,1cyclictest37850irq/131-snd_hda22:20:022
9219992220,1cyclictest37850irq/131-snd_hda22:05:112
9219992220,1cyclictest37850irq/131-snd_hda21:43:552
9219992220,1cyclictest37850irq/131-snd_hda21:16:162
9219992220,1cyclictest37850irq/131-snd_hda00:17:372
9219992219,2cyclictest37850irq/131-snd_hda21:20:242
9219992219,2cyclictest37850irq/131-snd_hda21:20:232
9219992120,1cyclictest37850irq/131-snd_hda23:56:422
9219992120,1cyclictest37850irq/131-snd_hda23:41:392
9219992120,1cyclictest37850irq/131-snd_hda23:37:162
9219992120,1cyclictest37850irq/131-snd_hda23:27:532
9219992120,1cyclictest37850irq/131-snd_hda23:10:362
9219992120,1cyclictest37850irq/131-snd_hda23:02:362
9219992120,1cyclictest37850irq/131-snd_hda22:46:272
9219992120,1cyclictest37850irq/131-snd_hda22:33:472
9219992120,1cyclictest37850irq/131-snd_hda21:56:572
9219992120,1cyclictest37850irq/131-snd_hda21:53:522
9219992120,1cyclictest37850irq/131-snd_hda21:48:242
9219992120,1cyclictest37850irq/131-snd_hda21:30:362
9219992120,1cyclictest37850irq/131-snd_hda21:25:412
9219992120,1cyclictest37850irq/131-snd_hda21:11:232
9219992120,1cyclictest37850irq/131-snd_hda00:37:342
9219992120,1cyclictest37850irq/131-snd_hda00:26:132
9219992120,1cyclictest37850irq/131-snd_hda00:21:372
9219992120,1cyclictest37850irq/131-snd_hda00:07:392
9219992120,1cyclictest37850irq/131-snd_hda00:01:582
9219992119,2cyclictest37850irq/131-snd_hda23:46:062
9219992119,1cyclictest37850irq/131-snd_hda23:19:282
9219992119,1cyclictest37850irq/131-snd_hda22:18:192
9219992119,1cyclictest37850irq/131-snd_hda21:35:222
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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