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2026-07-27 - 18:34

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #3

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 rack0slot3s.osadl.org (updated Mon Jul 27, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32406282268259,6sleep40-21swapper/418:42:594
32408332267228,30sleep30-21swapper/318:45:423
32406292262237,17sleep50-21swapper/518:42:595
32407042261214,17sleep10-21swapper/118:44:041
32408962259217,32sleep60-21swapper/618:46:366
32408302259216,33sleep00-21swapper/018:45:390
32406312248202,17sleep70-21swapper/718:43:017
32409012245221,16sleep20-21swapper/218:46:402
324122699350,1cyclictest0-21swapper/422:42:214
3241226993432,1cyclictest1390-21snmpd20:56:264
3241226993432,1cyclictest1390-21snmpd20:56:264
3241226993332,1cyclictest0-21swapper/400:05:034
3241239993231,1cyclictest1390-21snmpd22:07:447
3241226993230,1cyclictest0-21swapper/420:43:034
3241230993112,17cyclictest0-21swapper/522:53:045
3241239992928,1cyclictest0-21swapper/722:26:217
3241221992924,4cyclictest3352509-21cpuspeed_turbos22:20:573
324121299290,28cyclictest3367131-21irqstats_NMI22:47:451
324123599280,27cyclictest0-21swapper/622:49:346
3241230992826,2cyclictest0-21swapper/520:54:475
324121299280,24cyclictest0-21swapper/120:02:041
324122199270,3cyclictest0-21swapper/319:51:253
324122199270,25cyclictest0-21swapper/323:21:543
3241212992712,14cyclictest1390-21snmpd21:14:551
3241239992623,3cyclictest3334034-21cat21:43:367
3241239992612,1cyclictest2310646-21kworker/7:2+events22:42:177
324123999260,22cyclictest0-21swapper/723:13:497
324123999260,1cyclictest0-21swapper/700:33:207
3241235992624,1cyclictest0-21swapper/621:29:406
3241235992623,2cyclictest1390-21snmpd22:24:396
324123099260,25cyclictest0-21swapper/500:19:375
324123099260,22cyclictest0-21swapper/500:00:205
3241212992624,1cyclictest0-21swapper/122:09:591
324121299260,22cyclictest0-21swapper/119:30:001
324121299260,22cyclictest0-21swapper/100:36:221
3241205992623,2cyclictest3364318-21cat22:42:210
324120599260,24cyclictest0-21swapper/020:06:330
3241239992524,1cyclictest0-21swapper/721:52:217
3241239992524,1cyclictest0-21swapper/700:11:497
3241239992522,3cyclictest1390-21snmpd20:22:227
3241239992521,3cyclictest1390-21snmpd19:12:527
3241235992524,1cyclictest0-21swapper/600:24:496
324123599250,23cyclictest0-21swapper/621:48:426
3241230992521,3cyclictest1390-21snmpd22:09:375
3241230992521,3cyclictest1390-21snmpd20:12:335
3241230992521,3cyclictest1390-21snmpd19:48:165
3241226992517,5cyclictest3339527-21awk21:54:164
324122699251,23cyclictest0-21swapper/420:36:034
3241221992524,1cyclictest0-21swapper/320:54:473
3241221992521,3cyclictest1390-21snmpd22:01:093
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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