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2026-07-29 - 15:10

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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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 rack7slot7s.osadl.org (updated Wed Jul 29, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2690729165,8sleep00-21swapper/007:09:520
2668028860,9sleep30-21swapper/307:06:573
2671128661,9sleep20-21swapper/207:07:212
2552427665,6sleep10-21swapper/107:05:191
2700599280,27cyclictest0-21swapper/110:05:141
2700899260,26cyclictest0-21swapper/212:05:572
27005992525,0cyclictest0-21swapper/110:50:571
2700899230,23cyclictest0-21swapper/210:24:102
2700299222,17cyclictest8700-21kworker/u8:110:45:120
2700599210,20cyclictest0-21swapper/107:25:141
2700599210,1cyclictest0-21swapper/112:37:221
108682210,0sleep2311rcuc/210:40:252
40512200,0sleep30-21swapper/310:55:373
27012991919,0cyclictest0-21swapper/310:13:393
27012991914,4cyclictest0-21swapper/309:50:013
2700899190,17cyclictest0-21swapper/211:45:412
2701299180,17cyclictest0-21swapper/309:31:303
27008991816,1cyclictest0-21swapper/209:50:132
2700899180,18cyclictest0-21swapper/209:42:122
2700899180,17cyclictest0-21swapper/211:14:562
27005991816,1cyclictest20011-21diskmemload10:04:291
2700599181,1cyclictest16020-21ssh10:44:241
2700599180,18cyclictest0-21swapper/111:47:081
2700599180,0cyclictest0-21swapper/109:26:261
2700599180,0cyclictest0-21swapper/109:26:251
2700299180,2cyclictest0-21swapper/011:14:340
2700899170,17cyclictest0-21swapper/212:29:042
2700599177,3cyclictest225-21systemd-journal07:43:121
2700599170,2cyclictest141rcu_preempt11:04:511
2700299170,3cyclictest0-21swapper/009:20:050
2700899164,10cyclictest1298-21ls10:55:012
2700899160,16cyclictest0-21swapper/209:49:342
2700899160,15cyclictest0-21swapper/211:38:532
27005991612,3cyclictest13814-21ssh09:45:001
2700599161,1cyclictest17110-21ssh10:45:051
2700599160,1cyclictest0-21swapper/109:36:031
2700599160,16cyclictest0-21swapper/112:19:531
27002991615,1cyclictest0-21swapper/010:37:160
27012991510,4cyclictest55850irq/129-enp2s0-09:17:463
27008991513,1cyclictest0-21swapper/207:50:212
2700899150,15cyclictest0-21swapper/209:29:572
2700899150,15cyclictest0-21swapper/209:29:572
2700899150,13cyclictest0-21swapper/211:53:252
2700899150,0cyclictest0-21swapper/212:19:162
27005991514,0cyclictest0-21swapper/110:34:561
27005991513,1cyclictest0-21swapper/111:15:161
27005991511,2cyclictest20011-21diskmemload10:12:271
2700599150,0cyclictest0-21swapper/111:21:071
2700299157,4cyclictest225-21systemd-journal09:03:290
27002991511,3cyclictest4262-21cat07:30:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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