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2026-05-25 - 18:23

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, 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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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 rackaslot8s.osadl.org (updated Mon May 25, 2026 12:45:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
26042188124,33sleep10-21swapper/107:09:351
24392169114,29sleep20-21swapper/207:07:272
23162164104,29sleep30-21swapper/307:05:523
7302159101,29sleep00-21swapper/007:05:080
11792710,1sleep20-21swapper/210:05:232
93952670,1sleep10-21swapper/110:11:291
255742630,2sleep20-21swapper/211:12:042
324502580,11sleep012-21ksoftirqd/008:15:250
99352520,2sleep00-21swapper/012:37:180
277292500,2sleep30-21swapper/310:00:463
231132480,1sleep30-21swapper/309:34:253
23842460,2sleep30-21swapper/310:55:123
23842460,2sleep30-21swapper/310:55:123
2911994311,13cyclictest19921-21awk12:20:223
2911994113,12cyclictest16191-21runrttasks11:05:173
2911994013,11cyclictest25926-21rm11:12:273
291199396,22cyclictest0-21swapper/310:00:003
291199387,13cyclictest1059-21sh09:41:203
2911993812,9cyclictest13728-21rm11:03:373
2911993811,11cyclictest1074-21sh12:06:023
2911993811,10cyclictest5861-21ssh10:09:393
291199379,12cyclictest27457-21rm11:37:433
291199378,12cyclictest19438-21ntpq09:00:213
2911993711,9cyclictest16320-21sh10:40:343
2911993711,16cyclictest3356-21sh10:31:023
2911993710,9cyclictest7474-21chrt11:22:503
291199368,9cyclictest26758-21sh09:12:303
291199368,12cyclictest9863-21sh11:49:093
291199368,10cyclictest22544-21diskmemload11:53:113
2911993611,9cyclictest22544-21diskmemload09:26:473
2911993610,10cyclictest6323-21ssh09:21:013
291199358,10cyclictest9283-21ssh12:36:383
2911993512,12cyclictest24438-21sh10:23:073
2911993511,11cyclictest10948-21sh10:36:573
2911993510,9cyclictest30203-21sh11:15:213
2911993510,11cyclictest24846-21ssh09:35:183
322392340,13sleep228-21ksoftirqd/208:15:232
291199349,8cyclictest14613-21sed07:35:173
291199348,8cyclictest31233-21ssh09:15:253
291199348,8cyclictest22544-21diskmemload10:53:563
2911993413,18cyclictest31983-21strings08:15:203
291199337,9cyclictest0-21swapper/307:55:153
291199337,8cyclictest22544-21diskmemload09:54:293
291199337,11cyclictest12418-21sh11:26:043
291199337,10cyclictest26616-21ssh10:25:033
2911993311,12cyclictest29762-21rm12:04:003
30082320,2sleep10-21swapper/110:06:461
291199328,11cyclictest24876-21ssh10:47:273
291199328,10cyclictest31716-21sed11:40:243
291199328,10cyclictest22544-21diskmemload12:33:133
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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