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2026-03-20 - 21:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #4

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 here to display the system's profile data or here to proceed to next system.
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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack0slot4s.osadl.org (updated Fri Mar 20, 2026 00:46:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29655622394388,4sleep40-21swapper/419:09:4110
29620752391371,13sleep150-21swapper/1519:05:027
29652222355316,12sleep110-21swapper/1119:05:303
29655482352333,13sleep90-21swapper/919:09:2915
29654812352331,14sleep60-21swapper/619:08:3812
29653592351331,13sleep00-21swapper/019:07:120
29655312350330,13sleep130-21swapper/1319:09:175
29653642350330,13sleep30-21swapper/319:07:159
29653502350330,13sleep80-21swapper/819:07:0414
29652642348329,12sleep50-21swapper/519:05:5611
29619942348326,14sleep140-21swapper/1419:05:016
29653442347326,14sleep20-21swapper/219:06:588
29653322345325,13sleep70-21swapper/719:06:4613
29653522343323,13sleep100-21swapper/1019:07:062
29653792339318,13sleep120-21swapper/1219:07:244
29652302339318,14sleep10-21swapper/119:05:361
296608699448,25cyclictest0-21swapper/1422:23:126
2966062993938,1cyclictest3110573-21kworker/u32:4+flush-259:022:00:1513
296608699370,12cyclictest0-21swapper/1423:18:076
2966062993533,2cyclictest3218840-21iostat_ios23:05:1413
2966082993433,1cyclictest3032570-21kworker/u32:2+flush-259:020:30:155
2966082993433,1cyclictest3032570-21kworker/u32:2+flush-259:020:30:155
2966062993434,0cyclictest0-21swapper/721:49:5213
2966062993434,0cyclictest0-21swapper/719:41:5213
2966062993434,0cyclictest0-21swapper/719:16:1613
2966062993433,1cyclictest2991637-21kworker/u32:4+events_unbound19:45:1613
2966062993433,1cyclictest2977874-21kworker/u32:0+events_unbound19:30:1013
2966062993433,1cyclictest0-21swapper/723:49:4613
296604399340,31cyclictest3324400-21sh00:26:428
296608699339,11cyclictest0-21swapper/1419:27:286
2966066993330,2cyclictest2965257-21kworker/u32:2+flush-259:019:10:1614
2966062993331,2cyclictest3012717-21kworker/u32:2+flush-259:020:05:1713
2966082993231,1cyclictest3085242-21kworker/u32:1+events_unbound21:30:225
2966073993231,1cyclictest3110573-21kworker/u32:4+events_unbound22:20:152
2966073993230,1cyclictest3255105-21kworker/10:0+events23:55:192
2966073993230,1cyclictest3066226-21kworker/10:2+events21:35:122
2966073993228,1cyclictest3066226-21kworker/10:2+events21:41:522
296605799320,29cyclictest0-21swapper/600:30:1412
2966041993230,2cyclictest3169658-21kworker/u32:1+flush-259:022:30:151
296608899310,30cyclictest0-21swapper/1519:50:427
296608899310,30cyclictest0-21swapper/1519:40:187
296608299310,30cyclictest0-21swapper/1323:00:145
296608299310,30cyclictest0-21swapper/1300:25:165
2966073993130,1cyclictest3218799-21mii-tool23:05:142
2966073993130,1cyclictest3066226-21kworker/10:2+events21:33:222
2966073993129,1cyclictest3141563-21kworker/10:0+events22:42:202
2966073993129,1cyclictest3141563-21kworker/10:0+events22:34:302
2966073993129,1cyclictest3066226-21kworker/10:2+events22:04:322
2966073993129,1cyclictest3066226-21kworker/10:2+events21:12:322
296607399310,30cyclictest0-21swapper/1023:03:422
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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