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2026-06-08 - 08:20

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 Mon Jun 08, 2026 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1323899983,52cyclictest19947-21munin-node21:20:430
13242999216,9cyclictest19663-21crond21:20:303
1323899924,78cyclictest0-21swapper/022:04:320
1323899913,81cyclictest0-21swapper/022:45:000
1324299903,13cyclictest0-21swapper/322:37:033
1323899907,65cyclictest0-21swapper/021:16:170
1323899904,79cyclictest0-21swapper/000:30:230
1323899904,78cyclictest6779-21ssh00:10:480
1323899904,78cyclictest6779-21ssh00:10:480
1323899904,78cyclictest0-21swapper/022:10:410
1323899904,78cyclictest0-21swapper/022:10:410
1323899904,52cyclictest0-21swapper/023:40:370
1323899903,80cyclictest0-21swapper/022:52:130
1323899903,80cyclictest0-21swapper/022:52:130
1323899903,79cyclictest11559-21ssh23:30:450
1323899903,79cyclictest0-21swapper/000:06:450
13238999013,54cyclictest0-21swapper/022:20:570
13242998925,9cyclictest22972-21needreboot20:25:593
13242998918,16cyclictest0-21swapper/319:00:463
1323899894,77cyclictest0-21swapper/021:54:230
1323899893,79cyclictest0-21swapper/021:29:300
1323899893,79cyclictest0-21swapper/021:29:300
1323899893,78cyclictest22390-21munin-node23:45:530
1324299884,32cyclictest0-21swapper/300:15:363
1324299883,35cyclictest0-21swapper/322:05:303
1324299883,26cyclictest0-21swapper/321:23:573
1324299883,12cyclictest0-21swapper/322:53:453
1324299883,12cyclictest0-21swapper/322:53:453
1324299880,9cyclictest2768-21kworker/1:022:30:403
1323899884,77cyclictest0-21swapper/023:05:580
1323899884,77cyclictest0-21swapper/022:36:520
1323899884,77cyclictest0-21swapper/000:16:120
1323899884,76cyclictest0-21swapper/023:16:090
1323899884,66cyclictest0-21swapper/000:02:320
1323899883,78cyclictest0-21swapper/023:39:100
1323899883,77cyclictest0-21swapper/022:07:160
1323899883,77cyclictest0-21swapper/021:31:520
1323899883,76cyclictest0-21swapper/023:51:430
1324299874,24cyclictest0-21swapper/323:00:493
13242998720,9cyclictest7373-21memory21:00:553
1323899874,76cyclictest0-21swapper/022:58:460
1323899873,77cyclictest0-21swapper/021:40:560
1323899873,76cyclictest0-21swapper/023:12:340
1323899873,64cyclictest0-21swapper/021:12:030
1323899873,61cyclictest316401munin-node22:25:500
13242998634,45cyclictest0-21swapper/323:35:543
1323899864,75cyclictest0-21swapper/021:00:440
1323899864,74cyclictest0-21swapper/021:36:150
1323899864,64cyclictest0-21swapper/000:00:240
1323899864,63cyclictest0-21swapper/023:26:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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