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2026-07-10 - 17:00

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 Fri Jul 10, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
987529877,17sleep10-21swapper/107:08:341
785429381,8sleep00-21swapper/007:05:080
971029264,10sleep30-21swapper/307:06:273
989629064,8sleep20-21swapper/207:08:512
1008199280,10cyclictest915-21pmu-power10:25:212
1008499260,3cyclictest0-21swapper/309:39:003
1007599250,19cyclictest0-21swapper/008:30:160
1008199242,7cyclictest22956-21df_abs07:35:152
1008199242,6cyclictest30297-21gltestperf07:50:172
1008199240,2cyclictest20977-21wc09:40:002
1008199240,15cyclictest0-21swapper/210:18:432
33032230,0sleep10-21swapper/112:04:021
33032230,0sleep10-21swapper/112:04:021
10084992323,0cyclictest0-21swapper/312:28:203
1008499232,20cyclictest29623-21kworker/3:210:40:273
1008499231,21cyclictest29623-21kworker/3:210:38:573
1008199230,22cyclictest0-21swapper/210:50:012
1008499222,19cyclictest7567-21kworker/3:108:50:473
1008499222,19cyclictest7567-21kworker/3:108:40:543
1008499222,19cyclictest7567-21kworker/3:108:39:073
1008499222,19cyclictest32631-21kworker/3:009:08:133
1008499220,20cyclictest7567-21kworker/3:108:45:213
1008499220,20cyclictest7567-21kworker/3:108:45:213
1008199225,9cyclictest12862-21grep11:30:212
1008199220,19cyclictest0-21swapper/212:33:362
1007899220,22cyclictest0-21swapper/110:17:201
1007899220,1cyclictest0-21swapper/111:06:051
1008499213,18cyclictest32631-21kworker/3:009:10:073
1008499212,18cyclictest7567-21kworker/3:109:00:413
1008499212,18cyclictest7567-21kworker/3:108:55:293
1008199215,7cyclictest20078-21grep08:35:232
1008199210,21cyclictest0-21swapper/209:43:022
1008199210,20cyclictest0-21swapper/210:07:202
10078992120,0cyclictest0-21swapper/111:52:011
1007899210,16cyclictest0-21swapper/112:21:441
1007899210,0cyclictest0-21swapper/110:29:341
1007599217,7cyclictest8597-21munin-run10:50:010
10081992011,3cyclictest5824-21wc08:05:282
1008199200,19cyclictest0-21swapper/212:13:342
1007899200,17cyclictest3020-21diskmemload10:51:381
10081991911,3cyclictest13657-21sed07:15:182
1008199190,19cyclictest0-21swapper/211:51:332
1008199190,17cyclictest0-21swapper/211:16:322
1008199190,17cyclictest0-21swapper/210:02:102
1008199190,0cyclictest0-21swapper/211:43:252
1007899192,17cyclictest0-21swapper/110:35:211
10078991918,1cyclictest0-21swapper/110:05:131
1007599197,6cyclictest17422-21perf07:25:010
10084991818,0cyclictest0-21swapper/311:35:573
10084991813,5cyclictest0-21swapper/309:24:583
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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