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2026-08-30 - 03:44

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack1slot6s.osadl.org (updated Sun Aug 30, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
387421170,5sleep33876-21tr19:42:443
387421170,5sleep33876-21tr19:42:443
686921040,5sleep16865-21grep21:23:001
1179799944,14cyclictest0-21swapper/320:07:443
16292920,27sleep2281ktimersoftd/220:27:462
1179699914,71cyclictest0-21swapper/220:37:452
1179799904,26cyclictest0-21swapper/317:42:363
1179799904,26cyclictest0-21swapper/317:42:363
1179799895,31cyclictest17416-21runrttasks22:28:013
1179799895,31cyclictest17416-21runrttasks22:28:013
1179699893,80cyclictest0-21swapper/222:55:472
1179799885,26cyclictest0-21swapper/321:27:493
1179799885,26cyclictest0-21swapper/318:43:043
11797998720,12cyclictest0-21swapper/319:48:083
1179799864,43cyclictest0-21swapper/322:09:343
1179799864,33cyclictest405-21gltestperf22:52:413
1179699863,71cyclictest0-21swapper/220:17:432
1179799854,28cyclictest0-21swapper/319:32:523
11797998520,13cyclictest0-21swapper/323:00:313
1179699854,72cyclictest0-21swapper/221:42:522
1179699854,72cyclictest0-21swapper/221:42:522
1179699853,75cyclictest0-21swapper/222:57:482
1179699853,74cyclictest11966-21grep19:53:032
11796998523,56cyclictest0-21swapper/221:26:472
11796998523,55cyclictest0-21swapper/221:03:322
11797998437,10cyclictest28086-21runrttasks22:46:053
11797998433,12cyclictest0-21swapper/321:59:173
1179699844,73cyclictest0-21swapper/221:55:352
1179699844,72cyclictest0-21swapper/220:12:442
11797998320,12cyclictest0-21swapper/321:06:163
1179699834,72cyclictest1227-21runrttasks22:37:442
1179699834,71cyclictest0-21swapper/220:57:412
1179699833,73cyclictest0-21swapper/221:07:502
1179699833,72cyclictest29546-21grep22:47:432
1179699833,72cyclictest0-21swapper/223:07:342
1179699833,72cyclictest0-21swapper/223:07:342
11796998329,39cyclictest3319-21diskmemload21:58:182
11796998322,54cyclictest0-21swapper/222:06:542
11797998231,13cyclictest0-21swapper/320:28:023
11797998222,12cyclictest0-21swapper/320:44:473
1179699824,72cyclictest0-21swapper/222:08:352
1179699824,71cyclictest0-21swapper/222:24:442
1179699824,70cyclictest0-21swapper/220:48:092
1179699824,70cyclictest0-21swapper/219:47:592
1179699823,73cyclictest0-21swapper/221:27:272
1179699823,71cyclictest0-21swapper/220:07:002
1179699823,11cyclictest0-21swapper/219:28:012
11796998229,46cyclictest0-21swapper/223:05:322
11796998226,49cyclictest21065-21tune2fs20:07:492
11797998119,26cyclictest19830-21interrupts22:32:463
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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