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2026-06-10 - 07:01

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 Tue Jun 09, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2783229749,42sleep00-21swapper/007:05:200
2679229280,8sleep20-21swapper/207:05:112
2887329163,8sleep30-21swapper/307:09:263
2859628765,18sleep10-21swapper/107:05:491
2900699280,28cyclictest0-21swapper/211:46:052
2900699280,28cyclictest0-21swapper/211:15:282
2901099270,26cyclictest0-21swapper/309:40:273
2901099258,17cyclictest39-21ksoftirqd/311:00:143
2900699240,20cyclictest0-21swapper/210:20:482
29010992222,0cyclictest0-21swapper/309:23:413
29010992211,9cyclictest39-21ksoftirqd/307:55:143
29010992211,9cyclictest39-21ksoftirqd/307:55:133
2901099220,22cyclictest0-21swapper/309:47:173
2901099220,0cyclictest0-21swapper/310:24:253
2900099223,1cyclictest21814-21diskmemload12:23:040
2901099210,2cyclictest0-21swapper/311:57:453
2901099210,20cyclictest21814-21diskmemload10:55:453
29003992121,0cyclictest0-21swapper/111:25:371
2900399210,15cyclictest21814-21diskmemload11:50:081
235592210,0sleep00-21swapper/011:26:270
2901099200,2cyclictest39-21ksoftirqd/312:15:583
2901099200,19cyclictest0-21swapper/309:20:003
2900699204,12cyclictest0-21swapper/212:35:142
2900699201,2cyclictest0-21swapper/209:51:002
2900699201,2cyclictest0-21swapper/209:50:592
2900699200,16cyclictest0-21swapper/210:50:052
2900399205,11cyclictest13175-21cron11:59:591
2900099204,15cyclictest0-21swapper/008:20:130
2900099201,18cyclictest0-21swapper/010:25:420
2901099192,2cyclictest0-21swapper/311:39:343
29010991914,5cyclictest39-21ksoftirqd/312:12:303
29010991914,5cyclictest39-21ksoftirqd/309:12:553
2901099191,2cyclictest0-21swapper/312:22:293
29006991911,6cyclictest32-21ksoftirqd/211:29:482
2900699190,1cyclictest0-21swapper/209:26:522
2900099197,6cyclictest8520-21munin-run07:34:590
29010991817,1cyclictest0-21swapper/309:33:313
29010991817,1cyclictest0-21swapper/309:26:353
29010991816,2cyclictest381rcuc/310:14:453
29010991815,3cyclictest39-21ksoftirqd/312:32:043
29010991815,2cyclictest0-21swapper/310:32:223
29006991818,0cyclictest0-21swapper/209:32:272
29006991817,1cyclictest0-21swapper/209:21:252
29006991812,4cyclictest537-21snmpd10:04:532
2900699180,18cyclictest0-21swapper/209:41:242
2900399180,18cyclictest0-21swapper/110:15:431
2900399180,17cyclictest0-21swapper/109:51:001
2900399180,17cyclictest0-21swapper/109:51:001
2900399180,17cyclictest0-21swapper/109:17:041
2900099184,7cyclictest13494-21idleruntime-cro07:44:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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