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2025-07-02 - 12:30

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Wed Jul 02, 2025 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10681042150102,15sleep30-21swapper/319:05:063
1072640214498,15sleep00-21swapper/019:07:520
1072532213698,13sleep10-21swapper/119:06:341
10681022131107,16sleep20-21swapper/219:05:052
10835592990,2sleep1321rcuc/119:15:171
1072928993833,3cyclictest1326898-21cpuspeed_turbos22:30:143
1072928993524,9cyclictest1269725-21gltestperf21:55:153
1072928993322,9cyclictest1530349-21needreboot00:35:213
1072928993322,9cyclictest1195911-21cpuspeed_turbos21:10:143
1072928993218,11cyclictest0-21swapper/321:55:003
107292899318,2cyclictest0-21swapper/321:30:153
1072928993115,3cyclictest0-21swapper/300:10:003
1072928993024,3cyclictest1363853-21grep22:50:283
1072928993021,6cyclictest1378426-21cut23:00:193
1072928993021,6cyclictest1378426-21cut23:00:193
1072928993017,9cyclictest1290259-21users22:05:273
1072928993016,2cyclictest1153949-21needreboot20:25:203
1072928992918,9cyclictest709-21polkitd22:20:003
1072928992916,2cyclictest0-21swapper/323:20:143
1072928992915,2cyclictest0-21swapper/321:10:003
1072928992913,2cyclictest0-21swapper/300:00:143
1072928992911,6cyclictest1453788-21ls23:45:283
107292899290,6cyclictest1442403-21kthreadcore23:40:193
1072928992813,2cyclictest0-21swapper/322:15:013
1072928992811,9cyclictest1312140-21cut22:20:193
1072928992811,6cyclictest1129243-21ps20:00:243
1072928992810,6cyclictest1395100-21cut23:10:173
107292899279,7cyclictest0-21swapper/321:43:573
107292899277,7cyclictest1281597-21grep22:00:233
1072928992718,6cyclictest1094551-21grep19:25:273
1072928992717,7cyclictest1425215-21uname23:30:193
1072928992716,2cyclictest1358810-21sh22:49:473
1072928992715,2cyclictest1211529-21cron21:20:003
1072928992714,5cyclictest511ktimers/300:10:163
107292899271,16cyclictest1525639-21sh00:34:113
107292899271,16cyclictest1324394-21sh22:27:103
1072928992711,6cyclictest1211831-21ssh21:20:033
107292899270,17cyclictest1350669-21sh22:44:363
14614242260,2sleep20-21swapper/223:50:192
1072928992618,6cyclictest0-21swapper/323:27:393
1072928992615,4cyclictest511ktimers/323:58:473
107292899261,16cyclictest1518194-21sh00:29:113
107292899261,12cyclictest1391534-21cron23:10:003
107292899261,11cyclictest1257498-21cat21:45:253
107292899258,8cyclictest1073121-21apt-get19:10:133
107292899250,6cyclictest1226326-21ssh21:27:253
107292899250,16cyclictest1439143-21sh23:37:523
107292899250,16cyclictest1405864-21sh23:17:103
107292899248,7cyclictest1242961-21ssh21:37:303
1072928992412,3cyclictest1510929-21sh00:23:553
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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