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2026-08-15 - 01:39

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 Aug 14, 2026 12:43:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1250021050,0sleep00-21swapper/010:03:200
2682528471,9sleep20-21swapper/207:06:362
2639028473,6sleep00-21swapper/007:05:290
2690828371,8sleep30-21swapper/307:07:423
2676228164,13sleep10-21swapper/107:05:461
214192620,0sleep20-21swapper/209:30:082
301012500,0sleep20-21swapper/209:54:492
2716899273,6cyclictest3650-21acpi11:15:102
2716899270,1cyclictest0-21swapper/212:22:042
2716399270,26cyclictest0-21swapper/109:44:181
2716899251,4cyclictest0-21swapper/209:25:202
27163992523,1cyclictest0-21swapper/109:55:141
2716399250,25cyclictest0-21swapper/110:22:391
2717399240,2cyclictest0-21swapper/311:10:473
2716899230,5cyclictest21227-21fschecks_count11:25:162
2716399230,23cyclictest0-21swapper/112:18:121
2716299231,2cyclictest0-21swapper/011:35:390
2716899220,3cyclictest0-21swapper/209:45:392
2716399222,10cyclictest21013-21/usr/sbin/munin09:10:161
269152220,0sleep00-21swapper/012:26:090
2717399210,20cyclictest0-21swapper/312:25:123
2716899217,1cyclictest0-21swapper/212:34:332
2716899212,7cyclictest20645-21grep11:05:192
2716899210,20cyclictest0-21swapper/210:52:282
2716899210,20cyclictest0-21swapper/210:40:152
2716899210,1cyclictest0-21swapper/210:00:312
2716899210,19cyclictest0-21swapper/211:32:352
2716899210,18cyclictest0-21swapper/211:42:382
2716899210,18cyclictest0-21swapper/210:56:322
2716899210,0cyclictest0-21swapper/210:47:252
2716899206,3cyclictest25199-1kworker/u9:012:10:372
2716899201,10cyclictest0-21swapper/212:00:122
2716399200,20cyclictest0-21swapper/112:25:121
2717399190,1cyclictest0-21swapper/311:43:073
2716899191,11cyclictest0-21swapper/208:20:132
2716399194,12cyclictest19969-21diskmemload12:01:541
2716399190,1cyclictest19969-21diskmemload11:20:231
2716399190,18cyclictest0-21swapper/110:59:311
2716899184,3cyclictest225-21systemd-journal09:08:592
2716899182,5cyclictest0-21swapper/212:35:242
2716899180,17cyclictest0-21swapper/210:20:152
2716899180,16cyclictest0-21swapper/211:03:402
27163991816,1cyclictest38150irq/131-snd_hda07:20:191
2716399181,13cyclictest0-21swapper/107:55:131
2717399173,10cyclictest12205-21ssh12:17:463
2717399172,14cyclictest17634-21apache210:28:363
2717399170,2cyclictest0-21swapper/309:30:313
2717399170,1cyclictest0-21swapper/312:03:293
2717399170,0cyclictest0-21swapper/310:22:533
2716899172,3cyclictest13067-21aten2_r7power_c08:55:182
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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