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2025-09-17 - 02:47

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack3slot6s.osadl.org (updated Wed Sep 17, 2025 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
23645211594,16sleep10-21swapper/119:09:081
23495211595,15sleep20-21swapper/219:07:132
23553211294,12sleep30-21swapper/319:07:583
23396210594,6sleep00-21swapper/019:05:590
99312770,0sleep30-21swapper/322:20:003
66162740,1sleep00-21swapper/019:45:160
54682700,0sleep20-21swapper/200:27:372
2374099310,2cyclictest0-21swapper/221:25:152
310442300,1sleep339-21ksoftirqd/320:45:223
2374199291,9cyclictest0-21swapper/323:20:123
60372260,0sleep30-21swapper/322:48:543
223432250,0sleep00-21swapper/023:05:140
2374199241,20cyclictest2434-21ssh00:25:133
23741992218,2cyclictest0-21swapper/321:40:133
2374099221,16cyclictest0-21swapper/223:37:052
2374099221,16cyclictest0-21swapper/223:26:022
33152210,0sleep00-21swapper/021:38:250
2374199210,19cyclictest0-21swapper/321:55:123
2374099210,19cyclictest0-21swapper/220:15:142
23739992117,2cyclictest0-21swapper/121:40:131
2373999211,18cyclictest0-21swapper/121:55:111
178532210,1sleep1221ktimersoftd/123:34:331
2374099200,18cyclictest0-21swapper/221:15:132
2373899200,2cyclictest0-21swapper/021:50:120
23740991916,2cyclictest7813-21kworker/u8:020:30:012
23740991916,2cyclictest11895-21kworker/u8:120:14:052
2373899191,16cyclictest7632-21diskmemload21:45:130
2373899190,17cyclictest0-21swapper/023:50:140
23740991815,2cyclictest8035-21kworker/u8:221:42:042
23740991815,2cyclictest4396-21kworker/u8:000:33:042
23740991815,2cyclictest24254-21kworker/u8:122:39:052
273722170,0sleep00-21swapper/023:44:110
23740991714,2cyclictest9020-21kworker/u8:121:58:052
23740991714,2cyclictest23566-21kworker/u8:119:19:042
23739991714,2cyclictest20917-21rm21:23:041
228721710,3sleep10-21swapper/120:55:181
2374199162,2cyclictest21203-21timerwakeupswit20:20:253
2374199161,13cyclictest0-21swapper/320:30:153
23740991613,2cyclictest8035-21kworker/u8:221:11:052
23740991613,2cyclictest31626-21kworker/u8:220:51:042
23740991613,2cyclictest31626-21kworker/u8:220:48:052
23740991613,2cyclictest17960-21kworker/u8:220:22:012
23740991613,2cyclictest1187-21kworker/u8:219:45:052
23740991613,2cyclictest11842-21kworker/u8:123:41:042
2374099161,12cyclictest0-21swapper/200:00:132
2374099161,11cyclictest7632-21diskmemload22:50:232
2374099160,14cyclictest0-21swapper/223:55:122
2374099160,14cyclictest0-21swapper/223:55:112
2374099160,12cyclictest0-21swapper/219:26:052
23739991612,3cyclictest9020-21kworker/u8:121:54:041
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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