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2026-06-30 - 10:09

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 Tue Jun 30, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4965462269218,16sleep40-21swapper/418:01:124
4968672256218,15sleep30-21swapper/318:06:183
4965862256208,17sleep20-21swapper/218:01:472
4967932255208,17sleep70-21swapper/718:05:067
4966512249239,7sleep60-21swapper/618:02:516
4945532244220,16sleep10-21swapper/118:00:401
4965472243219,16sleep50-21swapper/518:01:135
4967022242216,17sleep00-21swapper/018:03:410
497181993432,1cyclictest1390-21snmpd18:34:222
49716899317,22cyclictest0-21swapper/020:41:290
497199992827,1cyclictest1390-21snmpd22:32:016
497194992827,1cyclictest0-21swapper/520:10:515
497194992822,5cyclictest0-21swapper/521:23:085
49718599285,22cyclictest491ktimers/321:59:433
497199992726,1cyclictest0-21swapper/620:21:596
49719499270,25cyclictest0-21swapper/522:15:515
49718599273,22cyclictest491ktimers/318:57:173
49718599272,22cyclictest491ktimers/322:51:283
49718599271,1cyclictest491ktimers/321:34:093
49716899270,25cyclictest0-21swapper/021:15:330
497203992622,3cyclictest1390-21snmpd21:17:337
49719999260,24cyclictest0-21swapper/622:07:316
49719099260,22cyclictest0-21swapper/423:01:114
497185992624,1cyclictest0-21swapper/320:10:523
49718599262,22cyclictest491ktimers/321:05:553
49718599262,22cyclictest491ktimers/321:05:553
49718599262,22cyclictest491ktimers/320:30:213
49718599262,22cyclictest491ktimers/300:35:463
49718599261,1cyclictest491ktimers/323:05:383
49718599261,1cyclictest491ktimers/320:42:033
49718599261,1cyclictest491ktimers/320:39:193
49718199260,22cyclictest0-21swapper/221:49:072
49716899260,24cyclictest0-21swapper/018:42:110
49716899260,22cyclictest0-21swapper/023:22:040
49716899260,22cyclictest0-21swapper/018:36:100
497203992523,1cyclictest1390-21snmpd22:13:317
497203992518,5cyclictest0-21swapper/718:52:427
497203992518,3cyclictest0-21swapper/700:25:277
497199992522,2cyclictest1390-21snmpd21:44:286
497199992521,3cyclictest1390-21snmpd23:40:496
497199992518,5cyclictest0-21swapper/620:00:446
497194992521,3cyclictest1390-21snmpd00:21:115
497194992521,3cyclictest1390-21snmpd00:21:105
49719499250,23cyclictest0-21swapper/523:39:555
497190992523,1cyclictest0-21swapper/418:28:404
497190992519,4cyclictest589606-21hddtemp_smartct21:23:064
49719099251,23cyclictest59-21ksoftirqd/420:25:404
49718599252,22cyclictest491ktimers/322:20:523
49718599252,22cyclictest491ktimers/321:19:473
49718599252,22cyclictest491ktimers/319:57:093
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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